MCQs / Engineering Reviewer - Solid State Devices Part 3

<table align="center" cellpadding="0" cellspacing="0" class="tr-caption-container" style="margin-left: auto; margin-right: auto; text-align: center;"><tbody> <tr><td><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEgBAFOUFkXCzEkmkqJFHsgI4myDxrWFeU3oy-9yRyk80jrgIB4gdMpAhtOm051QIk2OBb0TtpG9EFkrOn1YrFakx2zrZRlxxKlsAYeFG3kURgtbegWMXyFzdHvDgAWAFJPuwszw6tusfRsZ/s1600/mcqs-solid-state.jpg" imageanchor="1" style="margin-left: auto; margin-right: auto;"><img alt="MCQs - Solid State Devices" border="0" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEgBAFOUFkXCzEkmkqJFHsgI4myDxrWFeU3oy-9yRyk80jrgIB4gdMpAhtOm051QIk2OBb0TtpG9EFkrOn1YrFakx2zrZRlxxKlsAYeFG3kURgtbegWMXyFzdHvDgAWAFJPuwszw6tusfRsZ/s1600/mcqs-solid-state.jpg" title="MCQs - Solid State Devices" /></a></td></tr> <tr><td class="tr-caption" style="font-size: 12.8000001907349px;">MCQs - Solid State Devices</td></tr> </tbody></table> <b>Multiple Choice Questions / Practice Test</b><br /> <b>Solid State Devices</b><br /> <br /> 1. What is the charge of the hole?<br /> A. Equal to that of a proton<br /> B. Equal to that of an electron<br /> C.  Equal to that  of a neutron<br /> D. Equal to zero<br /> <br /> 2. It is the current gain for the common-emitter configuration<br /> A. α<br /> B. β<br /> C. δ<br /> D. ρ<br /> <br /> 3. when a factor a junction transistor is 0.98,the factor would be equivalent to  ______ value of transistor’s beta.<br /> A. 49<br /> B. 60<br /> C. 20<br /> D. 38<br /> <br /> 4. An emitter resistor is used for ________ in most amplifier circuits.<br /> A. Temperature stabilization<br /> B. Biasing a bipolar junction transistor<br /> C. Current limitation<br /> D. Voltage amplification<br /> <br /> 5. What line is drawn between the open-circuit current on a JFET characteristic curve?<br /> A. Operating point<br /> B. Load line<br /> C. Tangent line<br /> D. Quiescent point<br /> <br /> 6. Which of the choices below is another name for a photoconductive cell?<br /> A. Varicap<br /> B. Varistor<br /> C. Photoresistive device<br /> D. Photodiode<br /> <br /> 7. When both emitter and collector junctions are reverse biased, the transistor is said to be at _______ region.<br /> A. Active<br /> B. Cut-off<br /> C. Saturation<br /> D. Amplifying<br /> <br /> 8. What type of diode is used for tuning receivers and is normally operated with reverse bias and derived its name from voltage variable capacitor?<br /> A. Hot-carrier diode<br /> B. Varactor diode<br /> C. Tunnel diode<br /> D. Zener diode<br /> <br /> 9. What silicon npn tetrode serves as bistable negative-resistance device?<br /> A. BJT<br /> B. Binistor<br /> C. FET<br /> D. Thermistor<br /> <br /> 10. A multiple-terminal solid-state device similar to a transistor that generates frequencies up to about 10000 MHz by injecting electrons or holes into a space-charge layer which rapidly forces these carriers to a collecting electrode.<br /> A. Magnetron<br /> B. IMPATT<br /> C. Klystron<br /> D. Spacistor<br /> <br /> 11. Which of the items below is not a good conductor?<br /> A. Electrolytes<br /> B. Ionized gases<br /> C. Silicon<br /> D. Silver<br /> <br /> 12. What is the net charge if a certain semiconductor losses 4 valence electrons?<br /> A. +4<br /> B. -4<br /> C. +8<br /> D. -8<br /> <br /> 13. What is the net charge if a certain semiconductor gains one valence electron?<br /> A. +1<br /> B. -1<br /> C. +4<br /> D. -4<br /> <br /> 14. What is the approximate voltage drop of LED?<br /> A. 0.3 V<br /> B. 0.7 V<br /> C. 1.5 V<br /> D. 3.8 V<br /> <br /> 15. Under standard conditions, pure germanium has a resistivity of<br /> A.  60 Ω-cm<br /> B. 60 Ω-m<br /> C. 60 Ω-mm<br /> D. 60 x 10-4<br /> <br /> 16. The holding of one extreme amplitude of the input waveform to a certain amount of potential is called<br /> A. Slicing<br /> B. Limiting<br /> C. Rectifying<br /> D. Clamping<br /> <br /> 17. Clamper is also known as<br /> A. DC restorer<br /> B. Rectifier<br /> C. Charger<br /> D. Clipper<br /> <br /> 18. Percentage ripple can be calculated by getting the _______ and multiplying the result by100%.<br /> A. Ratio of the input resistance and input voltage<br /> B. Product of the ac current to dc current<br /> C. Ratio of the ac voltage to dc voltage<br /> D. Addition of the ac and dc component of the given signal<br /> <br /> 19. Which of the following materials has the smallest leakage current?<br /> A. Germanium<br /> B. Carbon<br /> C. Sulfur<br /> D. Silicon<br /> <br /> 20. What refers to annihilation of a hole and electron?<br /> A. Doping<br /> B. Recombination<br /> C. Diffusion<br /> D. Bonding<br /> <br /> 21. What are the two possible breakdown mechanisms in pn junction diodes?<br /> A. Reverse and breakdown effects<br /> B. Threshold and knee effects<br /> C. Avalanche and forward effects<br /> D. Zener and avalanche effects<br /> <br /> 22. What occurs in pn diodes when the electric field in the depletion layer increases to the point where it can break covalent bonds and generate electron hole pairs?<br /> A. Covalent breakdown<br /> B. Diffusion<br /> C. Zener breakdown<br /> D. Avalanche effect<br /> <br /> 23. The amount of additional energy required to emit an electron from the surface of metal is called<br /> A. Potential barrier<br /> B. Junction voltage<br /> C. Work function<br /> D. Knee voltage<br /> <br /> 24. When temperature of a pure semiconductor is increased, its resistance<br /> A. Decreases<br /> B. Remains the same<br /> C. Increases<br /> D. Cannot be estimated<br /> <br /> 25. As a general rule, ________ are found only in semiconductors.<br /> A. Electrons<br /> B. Bulk resistances<br /> C. Depletion layers<br /> D. Holes<br /> <br /> 26. What in a semiconductor is defined as the incomplete part of an electron pair bond?<br /> A. Hole<br /> B. Valence electron<br /> C. Impurity<br /> D. Ion<br /> <br /> 27. When the number of free electrons is increased in doped semiconductor, it becomes a/an ______ semiconductor.<br /> A. N type<br /> B. P type<br /> C. PN type<br /> D. NP type<br /> <br /> 28. Reducing the number of free electrons in a doped semiconductor forms a/an ________ semiconductor.<br /> A. N type<br /> B. P type<br /> C. PNPN type<br /> D. NPN type<br /> <br /> 29. Pure semiconductor atoms contain how many valence electrons?<br /> A. 1<br /> B. 2<br /> C. 4<br /> D. 8<br /> <br /> 30. An acceptor atom contains how many valence electrons?<br /> A. 1<br /> B. 2<br /> C. 3<br /> D. 4<br /> <br /> 31. What is the resistivity of an extrinsic semiconductor?<br /> A. 1 Ω-cm<br /> B. 2 Ω-cm<br /> C. 3 Ω-cm<br /> D. 4 Ω-cm<br /> <br /> 32. The forward resistance crystal diode is in the order of<br /> A. Ω<br /> B. mΩ<br /> C. µΩ<br /> D. kΩ<br /> <br /> 33. What is the ideal value stability factor?<br /> A. 1<br /> B. 0.5<br /> C. Infinite<br /> D. 100<br /> <br /> 34. What is the approximate mass of a neutron at rest?<br /> A. 1.6726 x 10^-27 kg<br /> B. 9.1096 x 10^-31 kg<br /> C. 1.6022 x 10^-19 kg<br /> D. No mass<br /> <br /> 35. Approximate mass at rest of a proton is ______ to that of a neutron.<br /> A. Greater than<br /> B. Equal<br /> C. Less than<br /> D. Comparable<br /> <br /> 36. Charge of an electron is approximately equal to<br /> A. 1.6022 x 10^-19 C<br /> B. -1.6726 x 10^-27 C<br /> C. -1.6022 x 10^-19 C<br /> D. No charge<br /> <br /> 37. What capacitors are used in transistor amplifiers?<br /> A. Mica<br /> B. Air<br /> C. Electrolytic<br /> D. Paper<br /> <br /> 38. What is the reason why a common collector is used for impedance matching?<br /> A. Its output impedance is very high<br /> B. Its output impedance is very low<br /> C. Its input impedance is very low<br /> D. Its input impedance is very high<br /> <br /> 39. In power supplies, circuits that are employed in separating the ac and dc components and bypass the ac components around the load, or prevent their generation are called<br /> A. Filters<br /> B. Limiters<br /> C. Series capacitors<br /> D. Diode circuits<br /> <br /> 40. A nuclei with a common number of protons, but with different number of neutrons<br /> A. Fission<br /> B. Isotope<br /> C. Atom<br /> D. Core<br /> <br /> 41. What is the reason why FET has high input impedance?<br /> A. Because its input is a forward biased<br /> B. Because of the impurity atoms<br /> C. Because its input is reverse biased<br /> D. Because it is made of semiconductor material.<br /> <br /> 42. A MOSFET is sometimes called _____FET<br /> A. Open gate<br /> B. Shorted gate<br /> C. Metallic gate<br /> D. Insulated gate<br /> <br /> 43. Which of the following choices is an advantage of a MOSFET over a BJT in an RF amplifier circuit?<br /> A. Low voltage operation<br /> B. Low noise<br /> C. Low amplification of signals<br /> D. Compatibility<br /> <br /> 44. The voltage gain of an emitter follower circuit is<br /> A. High<br /> B. Low<br /> C. Very high<br /> D. Moderate<br /> <br /> 45. A _________ is considered a current controlled device.<br /> A. Diode<br /> B. Field effect transistor<br /> C. Transistor<br /> D. Resistor<br /> <br /> 46. A ________ is considered a voltage controlled device<br /> A. FET<br /> B. Diode<br /> C. Transistor<br /> D. Capacitor<br /> <br /> 47. The value of coupling capacitor, Cc in RC coupling is about<br /> A. 0.01 µF<br /> B. 0.1 µF<br /> C. 10 µF<br /> D. 100 µF<br /> <br /> 48. FET has a pinch-off voltage of about<br /> A. 0.5 V<br /> B. 5 V<br /> C. 10 V<br /> D. 20 V<br /> <br /> 49. What is the point of intersection between a diode characteristic and a load line?<br /> A. Q point<br /> B. Quiescent point<br /> C. Operating point<br /> D. All of the above<br /> <br /> 50. A measure of the ability of an LED to produce the desired number of lumens generated per applied watt of electrical energy.<br /> A. Luminous intensity<br /> B. Luminous efficiency<br /> C. Luminous efficacy<br /> D. Luminous ability<br /> <div> <br /></div>

MCQs / Engineering Reviewer - Solid State Devices Part 3

MCQs - Solid State Devices Multiple Choice Questions / Practice Test Solid State Devices 1. What is the charge of the hole? A. Equal...

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MCQs / Engineering Reviewer - Solid State Devices Part 2

<div class="separator" style="clear: both; text-align: center;"> </div> <table align="center" cellpadding="0" cellspacing="0" class="tr-caption-container" style="margin-left: auto; margin-right: auto; text-align: center;"><tbody> <tr><td><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEgBAFOUFkXCzEkmkqJFHsgI4myDxrWFeU3oy-9yRyk80jrgIB4gdMpAhtOm051QIk2OBb0TtpG9EFkrOn1YrFakx2zrZRlxxKlsAYeFG3kURgtbegWMXyFzdHvDgAWAFJPuwszw6tusfRsZ/s1600/mcqs-solid-state.jpg" imageanchor="1" style="margin-left: auto; margin-right: auto;"><img alt="MCQs - Solid State Devices" border="0" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEgBAFOUFkXCzEkmkqJFHsgI4myDxrWFeU3oy-9yRyk80jrgIB4gdMpAhtOm051QIk2OBb0TtpG9EFkrOn1YrFakx2zrZRlxxKlsAYeFG3kURgtbegWMXyFzdHvDgAWAFJPuwszw6tusfRsZ/s1600/mcqs-solid-state.jpg" title="MCQs - Solid State Devices" /></a></td></tr> <tr><td class="tr-caption" style="font-size: 12.8000001907349px;">MCQs - Solid State Devices</td></tr> </tbody></table> <b>Multiple Choice Questions / Practice Test</b><br /> <b>Solid State Devices</b><br /> <br /> 1. The time taken by the diode to operate in the reversed condition from forward conduction.<br /> A. Maximum power time<br /> B. Reverse recovery time<br /> C. Lifetime<br /> D. Time allocation<br /> <br /> 2. Approximately, the atomic weight of germanium is<br /> A. 32<br /> B. 28.09<br /> C. 72.7<br /> D. 16<br /> <br /> 3. Atomic weight of silicon at 300 K is<br /> A. 28.09<br /> B. 72.7<br /> C. 5.32<br /> D. 16<br /> <br /> 4. An LED and phototransistor is equivalent to a/an<br /> A. Thermocouple<br /> B. FET<br /> C. Optocoupler<br /> D. Regulator<br /> <br /> 5. Optocoupler is otherwise known as<br /> A. Laser<br /> B. Photodiodes<br /> C. Optoisolator<br /> D. Photoconductive cell<br /> <br /> 6. When the emitter junction is forward biased while the collector junction is reverse biased, the transistor is at ________ region.<br /> A. Cut-off<br /> B. Saturation<br /> C. Active<br /> D. Breakdown<br /> <br /> 7. When both emitter and collector junction are forward biased, the transistor is said to be at _________ region.<br /> A. Active<br /> B. Cut-off<br /> C. Breakdown<br /> D. Saturation<br /> <br /> 8. An equivalent circuit of a diode in which it is represented as a switch in series with a barrier potential.<br /> A. First approximation<br /> B. Second approximation<br /> C. Third approximation<br /> D. Fourth approximation<br /> <br /> 9. Which of the following is the equivalent circuit for a diode for third approximation?<br /> A. A switch only<br /> B. A switch in series with a battery in series with a resistance<br /> C. A switch in series with battery<br /> D. A switch in series with a resistance<br /> <br /> 10. A silicon crystal is a/an ___________ of a semiconductor if every atom in the crystal is a silicon atom.<br /> A. Extrinsic<br /> B. Intrinsic<br /> C. P-type<br /> D. N-type<br /> <br /> 11. With pnp voltage divider bias, you must use<br /> A. Ground<br /> B. Negative power supplies<br /> C. Positive power supplies<br /> D. Resistors<br /> <br /> 12. Two pn silicon diodes are connected in series opposing. A 5 V voltage is impressed upon them. Find the voltage across each junction at room temperature when nVT= 0.052 V.<br /> A. 0.236 V, 3.2 V<br /> B. 4.764 V, 0.236 V<br /> C. 0.036 V, 4.964 V<br /> D. 3.21 V, 1.79 V<br /> <br /> 13. A half-wave signal has a period of<br /> A. 16.7 ms<br /> B. 8.3 ms<br /> C. 16.7 µs<br /> D. 8.3 µs<br /> <br /> 14. A full-wave signal has a period of<br /> A. 16.7 µs<br /> B. 8.3 µs<br /> C. 8.3 ms<br /> D. 16.7 ms<br /> <br /> 15. When doping increases, ________ of a semiconductor decreases.<br /> A. Impurity<br /> B. Conductivity<br /> C. Bulk resistance<br /> D. Minority carrier<br /> <br /> 16. Which of the following has the least noise level?<br /> A. FET<br /> B. BJT<br /> C. Triode<br /> D. Tetrode<br /> <br /> 17. Which of the following has the highest input impedance<br /> A. FET<br /> B. BJT<br /> C. MOSFET<br /> D. Crystal diode<br /> <br /> 18. The frequency of a half-wave signal is<br /> A. Twice the line frequency<br /> B. Equal to the line frequency<br /> C. One-half of the line frequency<br /> D. One-fourth the line frequency<br /> <br /> 19. For a full-wave rectifier, the output frequency<br /> A. Equals one-half the input frequency<br /> B. Equals the line frequency<br /> C. Equals two times the input<br /> D. Is three times the line frequency<br /> <br /> 20. The averaged dc voltage of a half wave rectifier circuit is _________ of the value of the peak input voltage.<br /> A. 63.6%<br /> B. 31.8%<br /> C. 4.8%<br /> D. 6.2%<br /> <br /> 21. The average dc voltage of a full wave rectifier circuit is __________ of the value of the peak input voltage.<br /> A. 31.8%<br /> B. 48.1%<br /> C. 63.6%<br /> D. 1%<br /> <br /> 22. Typical leakage current in a pn junction is in the order of<br /> A. µA<br /> B. mA<br /> C. nA<br /> D. pA<br /> <br /> 23. The resistance of a forward biased pn junction is in the order of<br /> A. Ω<br /> B. mΩ<br /> C. µΩ<br /> D. kΩ<br /> <br /> 24. The removal by electronic means of one extremity of an input waveform is called ________.<br /> A. Filtering<br /> B. Clamping<br /> C. Amplifying<br /> D. Clipping<br /> <br /> 25. Which of the choices below does not describe a clipper circuit?<br /> A. Limiter<br /> B. Amplitude selector<br /> C. Slicer<br /> D. Baseline stabilizer<br /> <br /> 26. The varactor diode is also called as<br /> A. Voltage-variable capacitance<br /> B. Varicap<br /> C. Epicap<br /> D. All of the above<br /> <br /> 27. What diode has no depletion layer<br /> A. Varactor<br /> B. Varistor<br /> C. Schottky diode<br /> D. Shockley diode<br /> <br /> 28. Varistors are used for line filtering to eliminate spikes and dips and is also called<br /> A. Transient regulator<br /> B. Transient limiter<br /> C. Transient filter<br /> D. Transient suppressor<br /> <br /> 29. Defined as random motion of holes and free electrons due to thermal agitation<br /> A. Fission<br /> B. Fusion<br /> C. Diffusion<br /> D. Ionization<br /> <br /> 30. The temperature coefficient of resistance of a semiconductor is<br /> A. Positive<br /> B. Negative<br /> C. Zero<br /> D. Infinity<br /> <br /> 31. A large signal amplifier which is biased so that collector current flow continuously during the complete electrical cycle of the signal as well as when no signal is present<br /> A. Class A<br /> B. Class B<br /> C. Class AB<br /> D. Class C <br /> <br /> 32. A large signal amplifier which is biased so that current is non zero for less than one-half cycle.<br /> A. Class AB<br /> B. Class C<br /> C. Class A<br /> D. Class B<br /> <br /> 33. A class ____ amplifier stage operates with a small forward bias of the transistor so that some collector current flows at all times<br /> A. A<br /> B. B<br /> C. AB<br /> D. C<br /> <br /> 34. What factor is shown on a data sheet that tells how much you have to reduce the power of a device?<br /> A. Power factor<br /> B. Derating factor<br /> C. Reactive factor<br /> D. Reduction factor<br /> <br /> 35. The time it takes to turn off a forward-biased diode is called the<br /> A. Forward recovery time<br /> B. Reverse recovery time<br /> C. Recombination<br /> D. Turn-off time<br /> <br /> 36. A heavily doped semiconductor has<br /> A. High resistance<br /> B. No effect on the semiconductor characteristics<br /> C. More heat dissipation<br /> D. Low resistance<br /> <br /> 37. Gallium arsenide, aluminum arsenide and gallium phosphide are classified as<br /> A. Elementary semiconductor<br /> B. Secondary semiconductor<br /> C. Intrinsic material made by doping<br /> D. Insulators<br /> <br /> 38. A lightly doped semiconductor has<br /> A. Low resistance<br /> B. High resistance<br /> C. No effect on a semiconductor<br /> D. More heat dissipated behaviors<br /> <br /> 39. The property or ability of a material to support charge flow or electron flow<br /> A. Resistance<br /> B. Conductance<br /> C. Resistivity<br /> D. Permeance<br /> <br /> 40. What is also known as photodiffusion effect?<br /> A. Dember effect<br /> B. Skin effect<br /> C. Destriau effect<br /> D. Night effect<br /> <br /> 41. An effect that occurs within the entire bulk of a semiconductor material rather than in a localized region or junction<br /> A. Silicon effect<br /> B. Dember effect<br /> C. Bulk effect<br /> D. Destriau effect<br /> <br /> 42. The creation voltage in a conductor or semiconductor by illumination of one surface<br /> A. Dember effect<br /> B. Skin effect<br /> C. Destriau effect<br /> D. Night effect<br /> <br /> 43. What device uses a material catwhisker as its anode and is classified as a hot-carrier diode?<br /> A. PIN<br /> B. Point-contact diode<br /> C. Shockley diode<br /> D. Crystal diode<br /> <br /> 44. What is the typical operating current of an LED?<br /> A. 50 mA<br /> B. 10 mA<br /> C. 20 mA<br /> D. 5 mA<br /> <br /> 45. At absolute zero temperature, a semiconductor behaves as a/an<br /> A. Good conductor<br /> B. Superconductor<br /> C. Insulator<br /> D. Variable resistor<br /> <br /> 46. Avalanche breakdown in a semiconductor takes place<br /> A. When forward current exceeds a certain value<br /> B. When potential barrier is reduced to zero<br /> C. When reverse bias exceeds a certain value<br /> D. When forward bias exceeds a certain value<br /> <br /> 47. A cold-cathode glow-discharge diode having a copper anode and a large cathode of sodium or other material.<br /> A. Tunnel diode<br /> B. BARITT diode<br /> C. Anotron<br /> D. READ diode<br /> <br /> 48. A microwave diode in which the carriers that transverse the drift region are generated by minority carrier injection from a forward-biased junction instead of being extracted from the plasma of an avalanche region.<br /> A. IMPATT<br /> B. TRAPAT<br /> C.  BARITT diode<br /> D. Esaki diode<br /> <br /> 49. What electronic circuit converts AC to DC where the DC output peak value can be greater than the AC input peak value?<br /> A. Voltage multiplier<br /> B. Rectifier<br /> C. Clamper<br /> D. Clipper<br /> <br /> 50. Which of the item below does not mean a VARACTOR diode?<br /> A. VOLTACAPS<br /> B. VARICAPS<br /> C. Voltage variable capacitors<br /> D. Variable resistance diode<br /> <div> <br /></div> <br /> Click the download button below to download this practice set <i>with answers</i> in PDF format.<br /> <a href="http://sh.st/g0vDQ" target="_blank"><img alt="Engineering Reviewer" border="0" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEj1-NjrpCxm6yjAbseWXzXAju2YTydqeOqudQCUdc7hgym5LtE20MCn25TSOjZjV02OCrkKMexBzS7VQClWlabKvR8YlX_gPz4idqAXShssWs9hSM6-Ym3HgwW1V7JJHMyE-X79QK0-KbTU/s1600/dl.png" /></a>

MCQs / Engineering Reviewer - Solid State Devices Part 2

MCQs - Solid State Devices Multiple Choice Questions / Practice Test Solid State Devices 1. The time taken by the diode to operate ...

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MCQs / Engineering Reviewer - Solid State Devices Part 1

<div class="separator" style="clear: both; text-align: center;"> </div> <table align="center" cellpadding="0" cellspacing="0" class="tr-caption-container" style="margin-left: auto; margin-right: auto; text-align: center;"><tbody> <tr><td style="text-align: center;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEgBAFOUFkXCzEkmkqJFHsgI4myDxrWFeU3oy-9yRyk80jrgIB4gdMpAhtOm051QIk2OBb0TtpG9EFkrOn1YrFakx2zrZRlxxKlsAYeFG3kURgtbegWMXyFzdHvDgAWAFJPuwszw6tusfRsZ/s1600/mcqs-solid-state.jpg" imageanchor="1" style="margin-left: auto; margin-right: auto;"><img alt="MCQs - Solid State Devices" border="0" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEgBAFOUFkXCzEkmkqJFHsgI4myDxrWFeU3oy-9yRyk80jrgIB4gdMpAhtOm051QIk2OBb0TtpG9EFkrOn1YrFakx2zrZRlxxKlsAYeFG3kURgtbegWMXyFzdHvDgAWAFJPuwszw6tusfRsZ/s1600/mcqs-solid-state.jpg" title="MCQs - Solid State Devices" /></a></td></tr> <tr><td class="tr-caption" style="text-align: center;">MCQs - Solid State Devices</td></tr> </tbody></table> <b>Multiple Choice Questions / Practice Test</b><br /> <b>Solid State Devices</b><br /> <br /> 1. How many electrons are there in the fourth orbit of a copper atom?<br /> A. 1<br /> B. 2<br /> C. 3<br /> D. 4<br /> <br /> 2. The maximum permissible number of electrons in the third orbit is<br /> A. 18<br /> B. 8<br /> C. 32<br /> D. 2<br /> <br /> 3. Varactor diodes are commonly used<br /> A. As voltage controlled capacitance<br /> B. As a constant current source<br /> C. As voltage multiplier<br /> D. As a constant voltage source<br /> <br /> 4. The reason why electrons are not pulled into the nucleus of an atom.<br /> A. Because of the centrifugal or outward force created by their orbital motion.<br /> B. Because of the force of attraction between them and the nucleus is weak.<br /> C. Because they are not being attracted by the positive nucleus.<br /> D. Because of the strong bonding between them that resists any force pulling them towards the nucleus.<br /> <br /> 5. The electrons in the largest orbit travel ________ than the electrons in the smaller orbits.<br /> A. More slowly<br /> B. Faster<br /> C. In the same velocity<br /> D. A little bit slower<br /> <br /> 6. A transistor configuration with the lowest current gain.<br /> A. Common base<br /> B. Common emitter<br /> C. Common collector<br /> D. Emitter-follower<br /> <br /> 7. A semiconductor in its purest form is called<br /> A. Pure semiconductor<br /> B. Doped semiconductor<br /> C. Intrinsic semiconductor<br /> D. Extrinsic semiconductor<br /> <br /> 8. Valence orbit is the other form for<br /> A. Outer orbit<br /> B. 3rd orbit<br /> C. 4th orbit<br /> D. 2nd orbit<br /> <br /> 9. K shell means<br /> A. First orbit<br /> B. 2nd orbit<br /> C. 3rd orbit<br /> D. 4th orbit<br /> <br /> 10.  For either germanium or silicon diodes, the barrier potential decreases _______ for each Celsius degree rise.<br /> A. 1 mV<br /> B. 3 mV<br /> C. 4 mV<br /> D. 2 Mv<br /> <br /> 11. A diode modeling circuit which considers the threshold voltage, average resistance and switch as the diode’s equivalent circuit.<br /> A. Ideal model<br /> B. Simplified model<br /> C. Piecewise linear model<br /> D. Real model<br /> <br /> 12. There are two mechanisms by which holes and electrons move through a silicon crystal. They are<br /> A. Covalent bond and recombination<br /> B. Diffusion and drift<br /> C. Free and charge particles<br /> D. Forward and reverse bias<br /> <br /> 13. A semiconductor is an element with a valence of<br /> A. Four<br /> B. Eight<br /> C. Two<br /> D. One<br /> <br /> 14. What orbit controls the electrical property of the atom?<br /> A. Valence orbit<br /> B. First orbit<br /> C. Fourth orbit<br /> D. M shell<br /> <br /> 15. ________ is a substance that contains atoms with several bands of electrons but with only one valence electron.<br /> A. Insulator<br /> B. Conductor<br /> C. Semiconductor<br /> D. Resistor<br /> <br /> 16. Pure silicon crystal atoms contain how may valence electrons as a result of covalent bonding?<br /> A. 1<br /> B. 4<br /> C. 8<br /> D. 16<br /> <br /> 17. The peak inverse voltage of a full wave center tapped rectifier circuit is equal to _______ of the input signal.<br /> A. Thrice the peak<br /> B. Twice the peak<br /> C. One half<br /> D. One third<br /> <br /> 18. Diffusion or storage capacitance is the term used to refer to<br /> A. The reverse bias capacitance of a diode<br /> B. The forward bias capacitance of a diode<br /> C. The breakdown capacitance of a zener diode<br /> D. The effective capacitance of the rectifier<br /> <br /> 19. What is considered as the key electrical conductivity?<br /> A. The number of electrons in the valence orbit<br /> B. The number of protons in the nucleus<br /> C. The number of neutrons in the nucleus<br /> D. The number of protons plus the number of electrons in the atom<br /> <br /> 20. Each atom in the silicon crystal has how many electrons in its valence orbit?<br /> A. 8<br /> B. 32<br /> C. 2<br /> D. 4<br /> <br /> 21. Lifetime is the amount of time between the creation and disappearance of a/an<br /> A. Free electron<br /> B. Proton<br /> C. Ion<br /> D. Neutron<br /> <br /> 22. A silicon crystal is an intrinsic semiconductor<br /> A. If every atom in the crystal is a silicon atom<br /> B. If majority of the atoms in crystal is a silicon atom<br /> C. If the crystal contains 14 silicon atoms<br /> D. If  the crystal is undoped<br /> <br /> 23. At room temperature, a silicon crystal acts approximately like a/an<br /> A. Insulator<br /> B. Semiconductor<br /> C. Conductor<br /> D. Superconductor<br /> <br /> 24. An extrinsic semiconductor is a<br /> A. Doped semiconductor<br /> B. Pure semiconductor<br /> C. Good insulator<br /> D. Good conductor<br /> <br /> 25. What is associated with random motion due to thermal agitation in the movement of holes and electrons in a silicon crystal?<br /> A. Drift<br /> B. Diffusion<br /> C. Doping<br /> D. Recombination<br /> <br /> 26. The peak inverse voltage of a half wave rectifier circuit is approximately equal to the ________ of the input signal.<br /> A. Peak amplitude<br /> B. Frequency<br /> C. Voltage sinusoidal<br /> D. Current<br /> <br /> 27. Silicon that has been doped with a trivalent impurity is called a/an<br /> A. P-type semiconductor<br /> B. N-type semiconductor<br /> C. Intrinsic semiconductor<br /> D. Extrinsic semiconductor<br /> <br /> 28. Silicon that has been doped with a pentavalent impurity is called a/an<br /> A. N-type semiconductor<br /> B. P-type semiconductor<br /> C. Intrinsic semiconductor<br /> D. Extrinsic semiconductor<br /> <br /> 29. What is another name for a pn crystal<br /> A. Junction diode<br /> B. PN junction<br /> C. Diode<br /> D. Lattice<br /> <br /> 30. An acceptor atom is also called<br /> A. Pentavalent atom<br /> B. Trivalent atom<br /> C. Minority carrier<br /> D. Majority carrier<br /> <br /> 31. Which is a donor atom?<br /> A. Trivalent atom<br /> B. Aluminum<br /> C. Boron<br /> D. Pentavalent atom<br /> <br /> 32. In an n-type semiconductor, free electrons are called<br /> A. Minority carriers<br /> B. Valence electrons<br /> C. Majority carriers<br /> D. Charge carriers<br /> <br /> 33. in an n-type semiconductor, holes are called<br /> A. minority carriers<br /> B. majority carriers<br /> C. protons<br /> D. charge carriers<br /> <br /> 34. What is the barrier potential of germanium at 25˚C<br /> A. 0.7 V<br /> B. 0.3 V<br /> C. 0.5 V<br /> D. 0.4 V<br /> <br /> 35. The barrier potential for a silicon diode at 25˚C is approximately<br /> A. 0.4 V<br /> B. 0.3 V<br /> C. 0.7 V<br /> D. 0.5 V<br /> <br /> 36. Each pair of positive and negative ions at the junction is called a/an<br /> A. Anion<br /> B. Positron<br /> C. Cation<br /> D. Dipole<br /> <br /> 37. When temperature increases, barrier potential ________<br /> A. Remains the same<br /> B. Decreases<br /> C. Increases<br /> D. Either increases or decreases depending on the semiconductor material used<br /> <br /> 38. Avalanche effects occurs at<br /> A. Higher reverse voltages<br /> B. Lower reverse voltages<br /> C. Higher forward voltages<br /> D. Lower forward voltages<br /> <br /> 39. The creation of free electrons through zener effect is also known as<br /> A. Avalanche emission<br /> B. Thermionic emission<br /> C. Low-field emission<br /> D. High-field emission<br /> <br /> 40. Zener effect only depends on the<br /> A. High-speed minority carriers<br /> B. High-speed majority carriers<br /> C. Intensity of the electric field<br /> D. Intensity of the magnetic field<br /> <br /> 41. What temperature is inside the diode, right at the junction of the p and n-type materials?<br /> A. Junction temperature<br /> B. Ambient temperature<br /> C. Internal temperature<br /> D. Absolute temperature<br /> <br /> 42. What is the input control parameter of a FET?<br /> A. Gate voltage<br /> B. Source voltage<br /> C. Drain voltage<br /> D. Gate current<br /> <br /> 43. One of the important diode parameters which gives the magnitude of current the diode candle without burning.<br /> A. Reverse saturation current<br /> B. Reverse current<br /> C. Forward current<br /> D. Forward breakdown current<br /> <br /> 44. The maximum reverse voltage that can be applied before current surges is called<br /> A. Reverse recovery time<br /> B. Maximum junction voltage<br /> C. Forward voltage<br /> D. Reverse breakdown voltage<br /> <br /> 45. What is the other name of Esaki diode?<br /> A. Diac<br /> B. Hot-carrier diode<br /> C. Shockley diode<br /> D. Tunnel diode<br /> <br /> 46. The most important application of schottky diodes is in<br /> A. Digital computers<br /> B. Power supplies<br /> C. Amplifier circuits<br /> D. Voltage regulators<br /> <br /> 47. A diode is a nonlinear device because<br /> A. It produces a nonlinear graph<br /> B. Its current is not directly proportional to its voltage<br /> C. It has a built-in barrier potential<br /> D. It can rectify alternating current<br /> <br /> 48. The sum of the resistance of the p-region and the n-region is called<br /> A. Junction resistance<br /> B. Extrinsic resistance<br /> C. Intrinsic resistance<br /> D. Bulk resistance<br /> <br /> 49. What is the typical bulk resistance of rectifier diodes?<br /> A. Less than 1Ω<br /> B. Greater than 1Ω<br /> C. Equal to 1Ω<br /> D. It depends on the doping level<br /> <br /> 50. The reverse bias diode capacitance is termed as<br /> A. Transition region capacitance<br /> B. Diffusion capacitance<br /> C. Storage capacitance<br /> D. Reverse capacitance<br /> <div> <br /></div> <div> <br /></div> <div> Click the download button below to download this practice set <i>with answers</i> in PDF format.<br /> <a href="http://sh.st/g0vU1" target="_blank"><img alt="Engineering Reviewer" border="0" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEj1-NjrpCxm6yjAbseWXzXAju2YTydqeOqudQCUdc7hgym5LtE20MCn25TSOjZjV02OCrkKMexBzS7VQClWlabKvR8YlX_gPz4idqAXShssWs9hSM6-Ym3HgwW1V7JJHMyE-X79QK0-KbTU/s1600/dl.png" /></a></div>

MCQs / Engineering Reviewer - Solid State Devices Part 1

MCQs - Solid State Devices Multiple Choice Questions / Practice Test Solid State Devices 1. How many electrons are there in the fou...

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MCQs / Engineering Reviewer - Electrical Circuits Part 6

<table align="center" cellpadding="0" cellspacing="0" class="tr-caption-container" style="margin-left: auto; margin-right: auto; text-align: center;"><tbody> <tr><td><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEio2WBhu0ZU9NOtyvc0xKg_CpYRRFpIUlDFzrhv2t7U3N7W_82JMeVssBOki2XxG-hyTPuOYAzf5UWZo1xKVtnd6wePsWfKZ0H9p1a_vbmH9LtTBE3xhUubrL-EiFphWE4BaWPPM_YOVhuB/s1600/mcqs-electrical-circuits.jpg" imageanchor="1" style="margin-left: auto; margin-right: auto;"><img alt="MCQs on Electrical Circuits" border="0" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEio2WBhu0ZU9NOtyvc0xKg_CpYRRFpIUlDFzrhv2t7U3N7W_82JMeVssBOki2XxG-hyTPuOYAzf5UWZo1xKVtnd6wePsWfKZ0H9p1a_vbmH9LtTBE3xhUubrL-EiFphWE4BaWPPM_YOVhuB/s1600/mcqs-electrical-circuits.jpg" title="MCQs on Electrical Circuits" /></a></td></tr> <tr><td class="tr-caption" style="font-size: 12.8000001907349px;">Engineering Reviewer - Electrical Circuits</td></tr> </tbody></table> <b>Multiple Choice Questions / Practice Test</b><br /> <b>Electrical Circuits</b><br /> <br /> 251. A neon glow lamp used as a night light ionizes at approximately<br /> A. 70 V<br /> B. 80 V<br /> C. 90 V<br /> D. 100 V<br /> <br /> 252. What dielectric is generally employed by a variable capacitor?<br /> A. Mica<br /> B. Air<br /> C. Electrolyte<br /> D. Ceramic<br /> <br /> 253. A switch designed to have low capacitance between its terminal when open.<br /> A. LOCAP switch<br /> B. AntiLOCAP  switch<br /> C. Anticapacitance switch<br /> D. Capacitance switch<br /> <br /> 254. A resistor wound with a wire doubled back on itself to reduce the inductance.<br /> A. Bifilar resistor<br /> B. Wire-wound resistor<br /> C. Anti-inductive resistor<br /> D. Bleeder resistor<br /> <br /> 255. What fusion of elements is without chemical action between them?<br /> A. Mixture<br /> B. Compound<br /> C. Alloy<br /> D. Ionization<br /> <br /> 256. In calculating maximum instantaneous power ___ voltage or current is used.<br /> A. Peak<br /> B. Average<br /> C. Rms<br /> D. Instantaneous<br /> <br /> 257. The area of capacitor plates increases two times, then its capacitance<br /> A. Increases two times<br /> B. Increases four times<br /> C. Decreases two times<br /> D. Decreases four times<br /> <br /> 258. If the inductance is decreased, the impedance of the circuit containing a resistor a capacitor and an inductor connected in series to an ac source<br /> A. Decreases<br /> B. Increases<br /> C. Decreases or increases<br /> D. Decreases, increases or remains the same<br /> <br /> 259. When the movable plates of a gang capacitor completely overlap the fixed plates, the capacitance of the capacitor is<br /> A. Halfway between maximum and minimum<br /> B. Maximum<br /> C. Minimum<br /> D. Zero<br /> <br /> 260. In a circuit, a passive element is one which<br /> A. Supplies energy<br /> B. Receives energy<br /> C. Both supplies and receives energy<br /> D. Attenuates signal<br /> <br /> 261. Rationalizing the denominator of a complex number means<br /> A. Eliminating the j component in the denominator<br /> B. Adding j component in the denominator<br /> C. Eliminating the j component in the numerator<br /> D. Adding j component in the numerator<br /> <br /> 262. When two complex conjugates are subtracted, the result is a<br /> A. Quadrature component only<br /> B. Complex component<br /> C. In-phase component<br /> D. Real component<br /> <br /> 263. A coil of inductance L has an inductive reactance of X<span style="font-size: xx-small;">L</span> in an ac circuit in which the effective current is I. The coil is made from a superconducting material. The rate at which power is dissipated in the coil is<br /> A. 0<br /> B. (I^2)X<span style="font-size: xx-small;">L</span><br /> C. IX<span style="font-size: xx-small;">L</span><br /> D. I(X<span style="font-size: xx-small;">L</span>^2)<br /> <br /> 264. If the capacitance of mica capacitor is 5 times the capacitance of air capacitor, then the relative permittivity of mica is<br /> A. 2.5<br /> B. 5<br /> C. 10<br /> D. 25<br /> <br /> 265. The hot resistance of an incandescent lamp is about ___ times its cold resistance.<br /> A. 10<br /> B. 5<br /> C. 50<br /> D. 100<br /> <br /> 266. When the temperature of copper wire is increased its resistance is<br /> A. Increased<br /> B. Decreased<br /> C. Constant<br /> D. Zero<br /> <br /> 267. A trimmer is a variable capacitor in which capacitance is varied by changing the<br /> A. Number of plates<br /> B. Dielectric<br /> C. Distance between plates<br /> D. Plate area<br /> <br /> 268. The reason why electrical appliances are not connected in series.<br /> A. Greater electrical power saving<br /> B. Power loss is minimum<br /> C. Appliances have different current ratings<br /> D. All of the above<br /> <br /> 269.  Form its definition, the unit of electric field, ξ is the N/C and equivalent unit of ξ is the<br /> A. V(m^2)<br /> B. V(m)<br /> C. V/(m^2)<br /> D. V/m<br /> <br /> 270. Which of the following is the peakiest?<br /> A. Square wave<br /> B. Sinusoidal wave<br /> C. Triangular wave<br /> D. Rectangular wave<br /> <br /> 271. Why are inductance and capacitance not relevant in a dc circuit?<br /> A. Because it is a simple circuit<br /> B. Because dc circuits require only resistance as load<br /> C. Because they do not exist in a dc circuit<br /> D. Because frequency of dc is zero<br /> <br /> 272. When capacitors are connected in parallel, the total capacitance is<br /> A. Greater than the largest capacitor<br /> B. Smaller than the largest capacitor<br /> C. Smaller than the smallest capacitor<br /> D. Greater than the smallest capacitor<br /> <br /> 273. When current and voltage arte in phase in an ac circuit, the ___ is equal to zero.<br /> A. Resistance<br /> B. Reactance<br /> C. Inductance<br /> D. Capacitance<br /> <br /> 274. Thevenin’s theorem is what form of an equivalent circuit?<br /> A. Current<br /> B. Voltage<br /> C. Both current and voltage<br /> D. Neither current nor voltage<br /> <br /> 275. Which of the following combination of length and cross-sectional area will give a certain volume of copper the least resistance?<br /> A. 2L and1/2 A<br /> B. Does not matter because the volume of copper remains the same<br /> C. L and A<br /> D. ½ L and 2 A<br /> <br /> 276. The ratio between the reactive power and the apparent power of an ac load is called<br /> A. Quality factor<br /> B. Power factor<br /> C. Power ratio<br /> D. Reactive power<br /> <br /> 277. What is the efficiency under the conditions of maximum power transfer?<br /> A. 50 %<br /> B. 100 %<br /> C. 25 %<br /> D. 75 %<br /> <br /> 278. The charging of a capacitor through a resistance follows what law?<br /> A. Linear law<br /> B. Hyperbolic law<br /> C. Inverse-square law<br /> D. Exponential law<br /> <br /> 279. Norton’s theorem is what form of an ac equivalent circuit?<br /> A. Voltage<br /> B. Current<br /> C. Both voltage and current<br /> D. Neither voltage nor current<br /> <br /> 280. What is the total capacitance of 10 capacitors, each of 20 μF in series?<br /> A. 200 μF<br /> B. 2 μF<br /> C. 100 μF<br /> D. 0.5 μF<br /> <div> <br /></div> 281. An inductive load always has a ___ power factor<br /> A. Leading<br /> B. Lagging<br /> C. Zero<br /> D. Unity<br /> <br /> 282. When resistance are connected in parallel, the total resistance is<br /> A. Less than the smallest resistance in the connection<br /> B. Greater than the smallest resistance in the connection<br /> C. Between the smallest and greatest resistance in the connection<br /> D. Increasing and decreasing depending upon the supply voltage<br /> <br /> 283. The arc across a switch when it open an RL circuit is a result of the<br /> A. Large self-induced voltage across L<br /> B. Long time constant<br /> C. Low resistance of the open switch<br /> D. Surge of resistance<br /> <br /> 284. What is a rotating vector whose projection can represent either current or voltage in an ac circuit?<br /> A. Polar diagram<br /> B. Scalar quantity<br /> C. Velocity<br /> D. Phasor<br /> <br /> 285. Which factor does not affect resistance?<br /> A. Length<br /> B. Resistivity<br /> C. Cross-sectional area<br /> D. Mass<br /> <br /> 286. Which of the following capacitors are used only in dc circuits?<br /> A. Mica<br /> B. Ceramic<br /> C. Mylar<br /> D. Electrolytic<br /> <br /> 287. The maximum power transfer theorem is used in<br /> A. Power system<br /> B. Electronic system<br /> C. Refrigeration<br /> D. Air conditioning<br /> <br /> 288. In Norton’s theorem, the short circuit current is obtained by<br /> A. Opening the load terminals<br /> B. Shorting the load terminals<br /> C. Opening the voltage source<br /> D. Shorting the voltage source<br /> <br /> 289. For maximum power transfer, what is the relation between load resistance RL and internal resistance R of the voltage source?<br /> A. R<span style="font-size: xx-small;">L</span> = 2 r<br /> B. R<span style="font-size: xx-small;">L</span> = 1.5 r<br /> C. R<span style="font-size: xx-small;">L</span> = r<br /> D. R<span style="font-size: xx-small;">L</span> = 3 r<br /> <br /> 290. A capacitor of 0.5 μF charged to 220 V is connected across an uncharged 0.5 μF capacitor. What is the voltage across each capacitor?<br /> A. 220 V<br /> B. 150 V<br /> C. 110 V<br /> D. 22 V<br /> <br /> 291. When capacitors are connected in series, the total capacitance is<br /> A. Smaller than the smallest capacitor<br /> B. Smaller than the largest capacitor<br /> C. Greater than any of the capacitor<br /> D. Greater than the largest capacitor<br /> <br /> 292. What theorem is generally used in the analysis of vacuum tubes?<br /> A. Superposition theorem<br /> B. Millman’s theorem<br /> C. Thevenin’s theorem<br /> D. Norton’s theorem<br /> <br /> 293. Another term of the quality factor of the resonant circuit.<br /> A. Figure of merit<br /> B. Figure of demerit<br /> C. Noise factor<br /> D. Noise figure<br /> <br /> 294. Which of the following represents the energy stored in a capacitor?<br /> A. (CV^2)/2<br /> B. (2Q^2)/C<br /> C. (C^2)/V<br /> D. CV<br /> <br /> 295. What theorem is usually used in the analysis of transistor circuit?<br /> A. Superposition theorem<br /> B. Millman’s theorem<br /> C. Thevenin’s theorem<br /> D. Norton’s theorem<br /> <br /> 296. Which of the following capacitors has the highest cost per μF?<br /> A. Plastic<br /> B. Air<br /> C. Mica<br /> D. Electrolytic<br /> <br /> 297. Under the conditions of maximum power transfer, a voltage source is delivering a power of 15 W to the load. What is the power generated by the source?<br /> A. 60 W<br /> B. 30 W<br /> C. 15 W<br /> D. 4 W<br /> <br /> 298. Which of the following is neither a basic physical law nor deliverable from one?<br /> A. Ohm’s law<br /> B. Coulomb’s law<br /> C. Kirchhoff’s first law<br /> D. Kirchhoff’s second law<br /> <br /> 299. Another term for superconductor.<br /> A. Generic conductor<br /> B. Ultraconductor<br /> C. Cryotron<br /> D. Cryogenic conductor<br /> <br /> 300. A circuit whose parameters change with voltage or current.<br /> A. Non-linear circuit<br /> B. Linear circuit<br /> C. Complex circuit<br /> D. Passive circuit<br /> <div> <br /> <br /> Click the download button below to download this practice set <i>with answers</i> in PDF format.<br /> <a href="http://sh.st/g0bYj" target="_blank"><img alt="Engineering Reviewer" border="0" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEj1-NjrpCxm6yjAbseWXzXAju2YTydqeOqudQCUdc7hgym5LtE20MCn25TSOjZjV02OCrkKMexBzS7VQClWlabKvR8YlX_gPz4idqAXShssWs9hSM6-Ym3HgwW1V7JJHMyE-X79QK0-KbTU/s1600/dl.png" /></a></div>

MCQs / Engineering Reviewer - Electrical Circuits Part 6

Engineering Reviewer - Electrical Circuits Multiple Choice Questions / Practice Test Electrical Circuits 251. A neon glow lamp used a...

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MCQs / Engineering Reviewer - Electrical Circuits Part 5

<table align="center" cellpadding="0" cellspacing="0" class="tr-caption-container" style="margin-left: auto; margin-right: auto; text-align: center;"><tbody> <tr><td><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEio2WBhu0ZU9NOtyvc0xKg_CpYRRFpIUlDFzrhv2t7U3N7W_82JMeVssBOki2XxG-hyTPuOYAzf5UWZo1xKVtnd6wePsWfKZ0H9p1a_vbmH9LtTBE3xhUubrL-EiFphWE4BaWPPM_YOVhuB/s1600/mcqs-electrical-circuits.jpg" imageanchor="1" style="margin-left: auto; margin-right: auto;"><img alt="MCQs on Electrical Circuits" border="0" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEio2WBhu0ZU9NOtyvc0xKg_CpYRRFpIUlDFzrhv2t7U3N7W_82JMeVssBOki2XxG-hyTPuOYAzf5UWZo1xKVtnd6wePsWfKZ0H9p1a_vbmH9LtTBE3xhUubrL-EiFphWE4BaWPPM_YOVhuB/s1600/mcqs-electrical-circuits.jpg" title="MCQs on Electrical Circuits" /></a></td></tr> <tr><td class="tr-caption" style="font-size: 12.8000001907349px;">Engineering Reviewer - Electrical Circuits</td></tr> </tbody></table> <b>Multiple Choice Questions / Practice Test</b><br /> <b>Electrical Circuits</b><br /> <br /> 201. The distance between the capacitor plates increases two times, then its capacitance<br /> A. Increases two times<br /> B. Increases four times<br /> C. Decreases two times<br /> D. Decreases four times<br /> <br /> 202. The ratio between the active power and the apparent power of a load in an ac circuit is called<br /> A. Quality factor<br /> B. Power factor<br /> C. Power ratio<br /> D. Power reactive<br /> <br /> 203. When the power factor of a circuit is zero,<br /> A. Power absorbed is maximum<br /> B. Power absorbed is minimum<br /> C. Power absorbed is zero<br /> D. The impedance is minimum<br /> <br /> 204. How many degrees of phase represents one full cycle?<br /> A. 360<br /> B. 180<br /> C. 270<br /> D. 90<br /> <br /> 205. Which of the following does not generally affect the value of a capacitor?<br /> A. The dielectric material used<br /> B. The surface area of the plates<br /> C. The thickness of the dielectric<br /> D. The voltage applied to the plate<br /> <br /> 206. What is the purpose of a load in an electric circuit?<br /> A. To increase the circuit current<br /> B. To decrease the circuit current<br /> C. To utilize electrical energy<br /> D. To make the circuit complete<br /> <br /> 207. The power factor of a certain circuit in which the voltage lags behind the current is 80 %. To increase the power to 100 %, it is necessary to add ___ to the circuit.<br /> A. Inductance<br /> B. Capacitance<br /> C. Resistance<br /> D. Impedance<br /> <br /> 208. Refers to the outward-curving distortion of the lines of force near the edges of two parallel metal plates that form a capacitor.<br /> A. Skin effect<br /> B. Night effect<br /> C. Edge effect<br /> D. Hall effect<br /> <br /> 209. If voltage across the plates of 2 F capacitor is increased by 4 V, then charge on the plates will<br /> A. Decrease by 2 C<br /> B. Increase by 2 C<br /> C. Decrease by 4 C<br /> D. Increase by 4 C<br /> <br /> 210. What does a capacitor store?<br /> A. Voltage<br /> B. Charge<br /> C. Current<br /> D. Power<br /> <div> <br /></div> <div> <div> 211. The mutual inductance between two coils is ___ the reluctance of magnetic path.</div> <div> A. Directly proportional to</div> <div> B. Inversely proportional to</div> <div> C. Independent to</div> <div> D. Equal to</div> <div> <br /></div> <div> 212. The result of rust in electrical (wire) connection is</div> <div> A. Inductance</div> <div> B. Conductance</div> <div> C. Impedance</div> <div> D. Resistance</div> <div> <br /></div> <div> 213. Which of the following is a disadvantage of a wire-wound resistor?</div> <div> A. It has reactance in radio-frequency circuits</div> <div> B. It cannot handle much power</div> <div> C. It draws a large amount of current</div> <div> D. It cannot handle high voltage</div> <div> <br /></div> <div> 214. The resistance of an insulator ___ when its temperature is increased.</div> <div> A. Decreases</div> <div> B. Remains the same</div> <div> C. Increases</div> <div> D. Varies</div> <div> <br /></div> <div> 215. The wavelength of an alternating waveform depends upon the ___ of the variation.</div> <div> A. Period</div> <div> B. Number</div> <div> C. Frequency</div> <div> D. Amplitude</div> <div> <br /></div> <div> 216. Delta to wye or wye to delta transformation technique is applied to a ___ network.</div> <div> A. One-terminal</div> <div> B. Two-terminal</div> <div> C. Three-terminal</div> <div> D. Complex</div> <div> <br /></div> <div> 217. For greater accuracy, the value of phase angle θ should be determined from</div> <div> A. Cos θ</div> <div> B. Tan θ</div> <div> C. Sin θ</div> <div> D. Sec θ</div> <div> <br /></div> <div> 218. Inductive reactance applies only to sine waves because it</div> <div> A. Increases with lower frequencies</div> <div> B. Increases with lower inductance</div> <div> C. Depends on the factor 2 π</div> <div> D. Decreases with higher frequencies</div> <div> <br /></div> <div> 219. What increases the resistance of wire at high frequencies?</div> <div> A. Temperature</div> <div> B. Voltage</div> <div> C. Skin effect</div> <div> D. Insulation</div> <div> <br /></div> <div> 220. An inductor carries 2 A dc. If its inductance is 100 μH, then what is its inductive reactance?</div> <div> A. Zero</div> <div> B. 1.3 kΩ</div> <div> C. 628 Ω</div> <div> D. -628 Ω</div> </div> <div> <br /></div> <div> <div> 221. Barium-strontium titanite dielectric material is also called</div> <div> A. Ceramic</div> <div> B. Polyster</div> <div> C. Electrolytic</div> <div> D. Bakelite</div> <div> <br /></div> <div> 222. In the 5-band method of capacitor color coding, the first band indicates</div> <div> A. Temperature coefficient</div> <div> B. Tolerance</div> <div> C. 1st digit</div> <div> D. Capacitance value</div> <div> <br /></div> <div> 223. What is the most convenient way of achieving large capacitance?</div> <div> A. By using multiplate construction</div> <div> B. By using air as dielectric</div> <div> C. By decreasing distance between plates</div> <div> D. By using dielectric of low permittivity</div> <div> <br /></div> <div> 224. A linear circuit is one whose parameters</div> <div> A. Change with change in voltage</div> <div> B. Change with change in current</div> <div> C. Do not change with voltage and current</div> <div> D. Change with change in voltage and current</div> <div> <br /></div> <div> 225. For a linear circuit, ___ voltage or current is used to calculate average power.</div> <div> A. Rms</div> <div> B. Peak</div> <div> C. Average</div> <div> D. Instantaneous</div> <div> <br /></div> <div> 226. When two coils of identical reactance are in parallel without mutual inductance, the reactance of the combination is ___ the reactance of each coil.</div> <div> A. One half</div> <div> B. Twice</div> <div> C. Four times</div> <div> D. One fourth</div> <div> <br /></div> <div> 227. Which of the following is also known as anti-resonant circuit?</div> <div> A. Parallel resonant circuit</div> <div> B. Series resonant circuit</div> <div> C. Tuned circuit</div> <div> D. Tank circuit</div> <div> <br /></div> <div> 228. In a complex number 5 + 10i, 10 is called ___ part.</div> <div> A. Imaginary</div> <div> B. Real</div> <div> C. Conjugate</div> <div> D. Integer</div> <div> <br /></div> <div> 229. The presence of an electric current is made known by</div> <div> A. Electric shock</div> <div> B. Effects produced</div> <div> C. Magnetic shock</div> <div> D. Flashing</div> <div> <br /></div> <div> 230. The reciprocal of a complex number is</div> <div> A. A complex number</div> <div> B. A real number</div> <div> C. An imaginary number</div> <div> D. A whole number</div> </div> <div> <br /></div> <div> <div> 231. Which of the following has negative temperature coefficient?</div> <div> A. Carbon</div> <div> B. Nickel</div> <div> C. Brass</div> <div> D. Constantan</div> <div> <br /></div> <div> 232. Which of the following is a common material used in wire-wound resistors?</div> <div> A. Manganin</div> <div> B. Carbon</div> <div> C. Bronze</div> <div> D. German silver wire</div> <div> <br /></div> <div> 233. If one resistance in a series connection is open, then</div> <div> A. The current is zero in all the other resistances</div> <div> B. The current is maximum in all the other resistances</div> <div> C. The voltage is zero across the open resistance</div> <div> D. The voltage is infinite across the open resistance</div> <div> <br /></div> <div> 234. What determines the magnitude of electric current?</div> <div> A. The rate at which electrons are produced</div> <div> B. The type of material used</div> <div> C. The current carrying capacity of the circuit</div> <div> D. The rate at which electrons pass a given point</div> <div> <br /></div> <div> 235. For a carbon composition resistor, typical resistance values range from</div> <div> A. 2.7 Ω to 22 MΩ</div> <div> B. 1000 Ω to 10000 Ω</div> <div> C. 10 Ω to 10 MΩ</div> <div> D. 2.7 Ω to 2.7 GΩ</div> </div> <div> <br /></div> <div> <div> 236. A lead conductor has a resistance of 25 Ω at 0 ˚C. Determine its resistance at -30 ˚C</div> <div> A. 22 Ω</div> <div> B. 24 Ω</div> <div> C. 12 Ω</div> <div> D. 11 Ω</div> <div> <br /></div> <div> 237.  An impedance given by 90∠-45˚ is a/an ___ impedance.</div> <div> A. Inductive</div> <div> B. Conductive</div> <div> C. Resistive</div> <div> D. Capacitive</div> <div> <br /></div> <div> 238. If a coil has a Q of 10, it means that</div> <div> A. The energy stored in the magnetic field of the coil is 10 times the energy wasted in its resistance</div> <div> B. The energy wasted in its resistance is 10 times the energy stored in the magnetic field of the coil</div> <div> C. It is a low Q coil</div> <div> D. It is a high Q coil</div> <div> <br /></div> <div> 239. What is the rms value of a square wave?</div> <div> A. Equals its peak value</div> <div> B. Equals its peak-to-peak value</div> <div> C. Peak divided by square root of two</div> <div> D. Peak divided by pi</div> <div> <br /></div> <div> 240. The rms value of a triangular or sawtooth waveform is ___ times its peak value.</div> <div> A. 0.577</div> <div> B. 0.500</div> <div> C. 0.25</div> <div> D. 0.707</div> <div> <br /></div> <div> 241. In a multiple capacitor, the plate area is</div> <div> A. Increased</div> <div> B. The same</div> <div> C. Decreased</div> <div> D. Variable</div> <div> <br /></div> <div> 242. What is the time constant for L of 240 mH in series with R of 20 Ω?</div> <div> A. 12 ms</div> <div> B. 4.8 s</div> <div> C. 83.3 s</div> <div> D. 12 s</div> <div> <br /></div> <div> 243. In an ac circuit, the power dissipated as heat depends on</div> <div> A. Impedance</div> <div> B. Capacitive reactance</div> <div> C. Resistance</div> <div> D. Inductive reactance</div> <div> <br /></div> <div> 244. Which of the following dielectric materials makes the lowest-capacitance capacitor?</div> <div> A. Paper</div> <div> B. Mica</div> <div> C. Air</div> <div> D. Electrolyte</div> <div> <br /></div> <div> 245. In adding or subtracting phasor quantities, ___ form is the most convenient.</div> <div> A. Polar</div> <div> B. Rectangular</div> <div> C. Trigonometric</div> <div> D. Exponential</div> <div> <br /></div> <div> 246. In dividing or multiplying phasor quantities, ___ form is used.</div> <div> A. Polar</div> <div> B. Rectangular</div> <div> C. Trigonometric</div> <div> D. Exponential</div> <div> <br /></div> <div> 247. The power factor of a circuit is equal to</div> <div> A. RZ</div> <div> B. X<span style="font-size: xx-small;">C</span>/Z</div> <div> C. X<span style="font-size: xx-small;">L</span>/Z</div> <div> D. R/Z</div> <div> <br /></div> <div> 248. The capacitance of a capacitor is ___ relative permittivity.</div> <div> A. Directly proportional to</div> <div> B. Inversely proportional to</div> <div> C. Equal to</div> <div> D. Inversely proportional to the square of</div> <div> <br /></div> <div> 249. If a multiplate capacitor has 10 plates, each of area 10 cm2, then</div> <div> A. 10 capacitors will be in parallel</div> <div> B. 10 capacitors will be in series</div> <div> C. 9 capacitors will be in parallel</div> <div> D. 9 capacitors will be in series</div> <div> <br /></div> <div> 250. Of the equivalent combination of units, which one is not equal to watt?</div> <div> A. (Ω^2)/V</div> <div> B. AV</div> <div> C. (A^2)Ω</div> <div> D. J/s</div> </div> <div> <br /> <br /> Click the download button below to download this practice set <i>with answers</i> in PDF format.<br /> <a href="http://sh.st/g0bW5" target="_blank"><img alt="Engineering Reviewer" border="0" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEj1-NjrpCxm6yjAbseWXzXAju2YTydqeOqudQCUdc7hgym5LtE20MCn25TSOjZjV02OCrkKMexBzS7VQClWlabKvR8YlX_gPz4idqAXShssWs9hSM6-Ym3HgwW1V7JJHMyE-X79QK0-KbTU/s1600/dl.png" /></a></div>

MCQs / Engineering Reviewer - Electrical Circuits Part 5

Engineering Reviewer - Electrical Circuits Multiple Choice Questions / Practice Test Electrical Circuits 201. The distance between th...

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MCQs / Engineering Reviewer - Electrical Circuits Part 4

<table align="center" cellpadding="0" cellspacing="0" class="tr-caption-container" style="margin-left: auto; margin-right: auto; text-align: center;"><tbody> <tr><td><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEio2WBhu0ZU9NOtyvc0xKg_CpYRRFpIUlDFzrhv2t7U3N7W_82JMeVssBOki2XxG-hyTPuOYAzf5UWZo1xKVtnd6wePsWfKZ0H9p1a_vbmH9LtTBE3xhUubrL-EiFphWE4BaWPPM_YOVhuB/s1600/mcqs-electrical-circuits.jpg" imageanchor="1" style="margin-left: auto; margin-right: auto;"><img alt="MCQs on Electrical Circuits" border="0" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEio2WBhu0ZU9NOtyvc0xKg_CpYRRFpIUlDFzrhv2t7U3N7W_82JMeVssBOki2XxG-hyTPuOYAzf5UWZo1xKVtnd6wePsWfKZ0H9p1a_vbmH9LtTBE3xhUubrL-EiFphWE4BaWPPM_YOVhuB/s1600/mcqs-electrical-circuits.jpg" title="MCQs on Electrical Circuits" /></a></td></tr> <tr><td class="tr-caption" style="font-size: 12.8000001907349px;">Engineering Reviewer - Electrical Circuits</td></tr> </tbody></table> <b>Multiple Choice Questions / Practice Test</b><br /> <b>Electrical Circuits</b><br /> <br /> 151. Metal tin becomes superconductor at approximately<br /> A. 6 K<br /> B. 3.7 K<br /> C. 5 K<br /> D. 4.7 K<br /> <br /> 152. In a complex resistance-reactance plane, X<span style="font-size: xx-small;">L</span> is represented<br /> A. By an axis opposite the R axis<br /> B. By an axis perpendicular to the X<span style="font-size: xx-small;">C</span> axis<br /> C. By an axis opposite the X<span style="font-size: xx-small;">C</span> axis<br /> D. By an axis parallel to the R axis<br /> <br /> 153. When the net reactance in a series coil-capacitor circuit is zero at frequency f, the nature of its reactance of frequency 2f is<br /> A. Inductive<br /> B. Capacitive<br /> C. Resistive<br /> D. Infinite<br /> <br /> 154. Which of the following is a way of decreasing mutual inductance?<br /> A. Moving the coils closer<br /> B. Moving the coils apart<br /> C. Decreasing the number of turns of either coil<br /> D. Increasing the number of turns of either coil<br /> <br /> 155. The charging of a capacitor through a resistance obeys<br /> A. Exponential law<br /> B. Logarithmic law<br /> C. Linear law<br /> D. Square law<br /> <br /> 156. The Q-factor of a parallel resonant circuit is also known as<br /> A. Voltage magnification factor<br /> B. Current magnification factor<br /> C. Gain magnification factor<br /> D. Resonance magnification factor<br /> <br /> 157. What is the specific resistance of a pure silicon?<br /> A. 55 Ω-mm<br /> B. 55 Ω-m<br /> C. 55 Ω-cm<br /> D. 55 kΩ-m<br /> <br /> 158. A capacitance of 0.05 μF equals<br /> A. 0.05 x 10^6 F<br /> B. 0.05 x 10^-6 F<br /> C. 0.05 x 10^-12 F<br /> D. 0.05 x 10^12 F<br /> <br /> 159. A 5 μF  capacitor charge to 5V has a stored charge equal to<br /> A. 1 μc<br /> B. 5 μc<br /> C. 25 μC<br /> D. 200 μc<br /> <br /> 160. The factor 0.707 for converting peak to rms applies only to<br /> A. Square waves<br /> B. Triangle waves<br /> C. Sawtooth waves<br /> D. Sine waves<br /> <br /> 161. When two in-phase sine waves that have identical frequency and amplitude are added together, then the result is a sine wave with ___ the amplitude of either.<br /> A. Half<br /> B. Twice<br /> C. Four times<br /> D. One-fourth<br /> <br /> 162. Liquids that are good conductors because of ionization are called<br /> A. Electrolytic<br /> B. Bases<br /> C. Acid<br /> D. Electrolytes<br /> <br /> 163. Tungsten filament of bulbs has a hot resistance higher than its cold resistance due to its temperature coefficient which is<br /> A. Positive<br /> B. Negative<br /> C. Zero<br /> D. Infinite<br /> <br /> 164. A term used to express the amount of electrical energy stored in electrostatic field.<br /> A. Joules<br /> B. Coulombs<br /> C. Watts<br /> D. Electron-volt<br /> <br /> 165. With double the number of turns by the same length and area, the inductance is<br /> A. The same<br /> B. Doubled<br /> C. Quartered<br /> D. Quadrupled<br /> <br /> 166. The temperature coefficient of resistance of electrolytes is<br /> A. Negative<br /> B. Positive<br /> C. Zero<br /> D. Infinite<br /> <br /> 167. What refers to the lowest voltage across any insulator that can cause current flow?<br /> A. Conduction voltage<br /> B. Critical voltage<br /> C. Breakdown voltage<br /> D. Voltage capacity<br /> <br /> 168. Capacitance increase with<br /> A. Larger plate area and less distance between plates<br /> B. Larger plate area and greater distance between plates<br /> C. Smaller plate area and less distance between plates<br /> D. Higher values of applied voltage<br /> <br /> 169. What is the resonant frequency of a circuit when L of 3 microhenrys and C of 40 picofarads are in series?<br /> A. 14.5 kHz<br /> B. 145 MHz<br /> C. 14.5 MHz<br /> D. 145 kHz<br /> <br /> 170. For a triangular and sawtooth waveform the rms voltage or current equals<br /> A. 0.707 times peak value<br /> B. 0.577 times peak value<br /> C. 0.577 times average value<br /> D. 0.707 times rms value<br /> <br /> 171. If two resistances of 9 Ω and 6 Ω are connected in parallel, the total resistance is<br /> A. 54 Ω<br /> B. 0.3 Ω<br /> C. 15 Ω<br /> D. 3.6 Ω<br /> <br /> 172. Refers specifically to steady state values of quantities in ac circuits which are complex numbers.<br /> A. Domain<br /> B. Scalar quantity<br /> C. Vector quantity<br /> D. Phasor quantity<br /> <br /> 173. A capacitor is used to<br /> A. Block dc current<br /> B. Pass dc current<br /> C. Open voltage source<br /> D. Short the voltage source<br /> <br /> 174. The usual load of a dc circuit is a/an<br /> A. Resistor<br /> B. Capacitor<br /> C. Inductor<br /> D. Both inductor and capacitor<br /> <br /> 175. The second strip of an electronic resistor color-code represents<br /> A. The multiplier<br /> B. The second digit of the value<br /> C. The temperature<br /> D. The tolerance<br /> <br /> 176. Which of the following is a preferred resistor value?<br /> A. 520<br /> B. 47<br /> C. 43,000<br /> D. 54,321<br /> <br /> 177. A three-by-three, series-parallel matrix of resistors, all having the same ohmic value, would have a net resistance of<br /> A. One-third the value of a single resistor<br /> B. Three times the value of a single resistor<br /> C. The same value as a single resistor<br /> D. Nine times the value of a single resistor<br /> <br /> 178. In an ac wave, 30 degrees of phase is ___ of a cycle.<br /> A. ½<br /> B. 1/12<br /> C. 1/3<br /> D. 1/30<br /> <br /> 179. What is the value of a carbon composition resistor with the following color code: Brown, white, orange, red<br /> A. 190 Ω; 10 %<br /> B. 19 kΩ; 2 %<br /> C. 19 kΩ; 20 %<br /> D. 1.9 kΩ; 2 %<br /> <br /> 180. The electric field strength between capacitor plates has a unit of<br /> A. Volts per meter<br /> B. Volts per mil<br /> C. Amperes per meter<br /> D. Amperes per mil<br /> <br /> 181. For multi-plate capacitor, capacitance is proportional to<br /> A. Number of plates less one(n – 1)<br /> B. Number of plates plus one(n + 1)<br /> C. Number of plates less two(n - 2)<br /> D. Number of plates (n)<br /> <br /> 182. A capacitor consists of two<br /> A. Conductors only<br /> B. Dielectric only<br /> C. Conductors separated by a dielectric<br /> D. Dielectric separated by a conductor<br /> <br /> 183. How many coulombs are delivered by a storage battery in 25 hours if it is supplying current at the rate of 3 A?<br /> A. 2.592 x 10^5 C<br /> B. 2.592 x 10^3 C<br /> C. 2.592 x 10^8 C<br /> D. 2.592 x 10^12 C<br /> <br /> 184. When frequency of an ac wave decreases, the value of X<span style="font-size: xx-small;">L</span> in a coil<br /> A. Approaches zero<br /> B. Gets larger positively<br /> C. Gets larger negatively<br /> D. Stays constant<br /> <br /> 185. The temperature-resistance coefficient of pure gold is<br /> A. 0.0034<br /> B. 0.0037<br /> C. 0.0038<br /> D. 0.0039<br /> <br /> 186. The capacitor opposes any change in voltage across it by<br /> A. Passing a voltage proportional to the rate of change of current<br /> B. Acting as a short circuit at time equal to zero<br /> C. Passing a current proportional to the rate of change of voltage<br /> D. Acting as a short circuit at time equal to infinity<br /> <br /> 187. What is the most common non-sinusoidal waveform?<br /> A. Square wave<br /> B. Triangular wave<br /> C. Trapezoidal wave<br /> D. Sawtooth wave<br /> <br /> 188. Which of the following capacitors is suitable for dc filter circuits?<br /> A. Mica<br /> B. Ceramic<br /> C. Paper<br /> D. Electrolytic<br /> <br /> 189. A series RL circuit has R of 10 Ω and X<span style="font-size: xx-small;">L</span> of 5 Ω, its impedance in rectangular form is given by<br /> A. 10 + j 5 Ω<br /> B. 10 + j 10 Ω<br /> C. 10 – j 5 Ω<br /> D. 10 – j 10 Ω<br /> <br /> 190. What is the reciprocal of capacitance?<br /> A. Reluctance<br /> B. Susceptance<br /> C. Elastance<br /> D. Conductance<br /> <br /> 191. If the output resistance of a voltage source is 4 Ω, it internal resistance should be<br /> A. 4 Ω<br /> B. 8 Ω<br /> C. 2 Ω<br /> D. Infinite<br /> <br /> 192. The curve between current and frequency is termed as<br /> A. Voltage curve<br /> B. Gain curve<br /> C. Power curve<br /> D. Resonance curve<br /> <br /> 193. What is the total effective capacitance of two 0.25 μF capacitors connected in series?<br /> A. 0.125 μF<br /> B. 1.25 μF<br /> C. 0.50 μF<br /> D. 2.5 if<br /> <br /> 194. What can be used to estimate resonant frequency and to find reactance at any frequency for any value of capacitor or inductor?<br /> A. Smith chart<br /> B. Reactance chart<br /> C. Impedance chart<br /> D. Resonance chart<br /> <br /> 195. For a parallel AC circuit, ___ is used as a reference phasor.<br /> A. Voltage<br /> B. Power<br /> C. Current<br /> D. Resistance<br /> <br /> 196. For a series AC circuit, ___ is not used as a reference phasor.<br /> A. Voltage<br /> B. Impedance<br /> C. Current<br /> D. Conductance<br /> <br /> 197. If a certain circuit has a current that is lagging the voltage by 45˚, then it displays<br /> A. Pure inductive reactance<br /> B. Resistance and capacitance reactance<br /> C. Resistance and inductive reactance<br /> D. Pure capacitive reactance<br /> <br /> 198. What maximum voltage can be applied across the capacitor for very short period of time?<br /> A. Working voltage<br /> B. Surge voltage<br /> C. Stray voltage<br /> D. Peak voltage<br /> <br /> 199. What is expected when two 20 kΩ, 1 watt resistor in parallel are use instead of one 10 kΩ, 1 watt?<br /> A. Provides higher current<br /> B. Provides less power<br /> C. Provides more power<br /> D. Provides wider tolerance<br /> <br /> 200. Which of the following materials has the lowest dielectric strength?<br /> A. Glass<br /> B. Paper<br /> C. Mica<br /> D. Teflon<br /> <div> <br /> <br /> Click the download button below to download this practice set <i>with answers</i> in PDF format.<br /> <a href="http://adf.ly/1BiQ9c" target="_blank"><img alt="Engineering Reviewer" border="0" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEj1-NjrpCxm6yjAbseWXzXAju2YTydqeOqudQCUdc7hgym5LtE20MCn25TSOjZjV02OCrkKMexBzS7VQClWlabKvR8YlX_gPz4idqAXShssWs9hSM6-Ym3HgwW1V7JJHMyE-X79QK0-KbTU/s1600/dl.png" /></a></div>

MCQs / Engineering Reviewer - Electrical Circuits Part 4

Engineering Reviewer - Electrical Circuits Multiple Choice Questions / Practice Test Electrical Circuits 151. Metal tin becomes super...

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MCQs / Engineering Reviewer - Electrical Circuits Part 3

<table align="center" cellpadding="0" cellspacing="0" class="tr-caption-container" style="margin-left: auto; margin-right: auto; text-align: center;"><tbody> <tr><td><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEio2WBhu0ZU9NOtyvc0xKg_CpYRRFpIUlDFzrhv2t7U3N7W_82JMeVssBOki2XxG-hyTPuOYAzf5UWZo1xKVtnd6wePsWfKZ0H9p1a_vbmH9LtTBE3xhUubrL-EiFphWE4BaWPPM_YOVhuB/s1600/mcqs-electrical-circuits.jpg" imageanchor="1" style="margin-left: auto; margin-right: auto;"><img alt="MCQs on Electrical Circuits" border="0" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEio2WBhu0ZU9NOtyvc0xKg_CpYRRFpIUlDFzrhv2t7U3N7W_82JMeVssBOki2XxG-hyTPuOYAzf5UWZo1xKVtnd6wePsWfKZ0H9p1a_vbmH9LtTBE3xhUubrL-EiFphWE4BaWPPM_YOVhuB/s1600/mcqs-electrical-circuits.jpg" title="MCQs on Electrical Circuits" /></a></td></tr> <tr><td class="tr-caption" style="font-size: 12.8000001907349px;">Engineering Reviewer - Electrical Circuits</td></tr> </tbody></table> <b>Multiple Choice Questions / Practice Test</b><br /> <b>Electrical Circuits</b><br /> <br /> 101. The potential gradient in a cable is maximum in<br /> A. Conductor<br /> B. Outer sheath<br /> C. Insulation<br /> D. Uniformly all over<br /> <br /> 102. The Q-factor of a parallel resonant circuit is also known as<br /> A. Current magnification factor<br /> B. Voltage magnification factor<br /> C. Load factor<br /> D. Leakage factor<br /> <br /> 103. The Q-factor of a series resonant circuit is also known as<br /> A. Current magnification factor<br /> B. Voltage magnification factor<br /> C. Load factor<br /> D. Leakage factor<br /> <br /> 104. What is the form factor of a triangular wave?<br /> A. 1.16<br /> B. 1.11<br /> C. 1.73<br /> D. 1.41<br /> <br /> 105. In a rectangular wave, the form factor is<br /> A. 1.11<br /> B. 1.16<br /> C. 1.0<br /> D. 1.73<br /> <br /> 106. Which of the following dielectric materials makes the highest-capacitance capacitor?<br /> A. Air<br /> B. Barium-strontium titanite<br /> C. Mica<br /> D. Electrolyte<br /> <br /> 107. In a circuit, an active element is one which<br /> A. Supplies energy<br /> B. Receives energy<br /> C. Both supplies and receives energy<br /> D. Amplifies signal<br /> <br /> 108. An electric circuit contains<br /> A. Passive elements<br /> B. Active elements<br /> C. Both active and passive elements<br /> D. Reactive elements<br /> <br /> 109. What is the hot resistance of a 100 W, 220 V incandescent lamp?<br /> A. 2.2 Ω<br /> B. 22 Ω<br /> C. 484 Ω<br /> D. 4.84 Ω<br /> <br /> 110. Which statement is true about a passive circuit?<br /> A. A circuit with neither a source of current nor a source of potential difference<br /> B. A circuit with a voltage source<br /> C. A circuit with a current source<br /> D. A circuit with only resistance as a load<br /> <br /> 111. What is a closed path made of several branches of the network called?<br /> A. Junction<br /> B. Node<br /> C. Terminal<br /> D. Loop<br /> <br /> 112. The internal resistance of an ideal voltage source is<br /> A. Infinite<br /> B. Equal to the load resistance<br /> C. Zero<br /> D. To be determined<br /> <br /> 113. What is the conductance of a circuit having three 10 Ω resistors in parallel?<br /> A. 0.3 S<br /> B. 3.33 S<br /> C. 0.33 S<br /> D. 30 S<br /> <br /> 114. Electric energy refers to<br /> A. Volt divided by coulomb<br /> B. Volt-ampere<br /> C. Volt-coulomb<br /> D. Watt divided by time<br /> <br /> 115. A capacitor requires 12 μC of charge to raise its potential of 3 V. What is the capacitance of the capacitor?<br /> A. 36 μF<br /> B. 15 μF<br /> C. 0.25 μF<br /> D. 4 μF<br /> <br /> 116. A capacitor opposes change in<br /> A. Voltage<br /> B. Current<br /> C. Voltage and current<br /> D. Neither voltage nor current<br /> <br /> 117. What is the total resistance of a two equal valued resistors in series?<br /> A. The difference of both<br /> B. The product of both<br /> C. Twice as one<br /> D. The sum of their reciprocals<br /> <br /> 118. The ratio of maximum value to the effective value of an alternating quantity is called<br /> A. Form factor<br /> B. Peak factor<br /> C. Dynamic factor<br /> D. Leakage factor<br /> <br /> 119. For series capacitors, total charge is<br /> A. The sum of individual charges<br /> B. Equal to the charge of either capacitors<br /> C. Equal to the product of the charges<br /> D. The quotient of the charges<br /> <br /> 120. Series resonant circuit is sometimes known as<br /> A. Rejector circuit<br /> B. Acceptor circuit<br /> C. Inductive circuit<br /> D. Capacitive circuit<br /> <br /> 121. Parallel resonant circuit is sometimes called as<br /> A. Acceptor circuit<br /> B. Rejector circuit<br /> C. Inductive circuit<br /> D. Capacitive circuit<br /> <br /> 122. When two pure sine waves of the same frequency and the same amplitude which are exactly 180˚ out-of-phase are added together, the result is<br /> A. A wave with twice the amplitude<br /> B. A wave with half the amplitude<br /> C. Zero signal<br /> D. A wave with twice the frequency<br /> <br /> 123. If two complex conjugates are added, ___ components results.<br /> A. In-phase<br /> B. Quadrature<br /> C. Complex<br /> D. Out-of-phase<br /> <br /> 124. If an emf in circuit A produces a current in circuit B, then the same emf in circuit B produces the same current in circuit A. this theorem is known as<br /> A. Maximum power transfer theorem<br /> B. Millman’s theorem<br /> C. Reciprocity theorem<br /> D. Norton’s theorem<br /> <br /> 125. According to Gauss theorem, flux can be equated to<br /> A. Charge<br /> B. Field intensity<br /> C. Current<br /> D. Voltage<br /> <br /> 126. An open resistor when checked with an ohmmeter reads<br /> A. Zero<br /> B. Infinite<br /> C. High but within the tolerance<br /> D. Low but not zero<br /> <br /> 127. Norton’s theorem is ____ Thevenin’s theorem.<br /> A. The same as<br /> B. The converse of<br /> C. Older that<br /> D. More accurate than<br /> <br /> 128. What value of R is needed with a 0.05 μF C for an RC time constant of 0.02 s?<br /> A. 400 Ω<br /> B. 400 MΩ<br /> C. 400 GΩ<br /> D. 400 kΩ<br /> <br /> 129. Which of the following is the statement of Ohm’s law?<br /> A. Electric current is directly proportional to both voltage and resistance<br /> B. Electric current varies directly as the voltage and inversely as the resistance<br /> C. Electrical power is directly proportional to the resistance and inversely as the current squared<br /> D. Electrical power is directly proportional to both voltage squared and the resistance<br /> <br /> 130. The admittance of a parallel RLC circuit is found to be the ___ sum of conductance and susceptances.<br /> A. Algebraic<br /> B. Arithmetic<br /> C. Vector<br /> D. Phasor<br /> <br /> 131. A wire of one kilometre length has a resistance of 20 Ω. If the length is halved, then the new resistance is ___ the original resistance.<br /> A. Half<br /> B. Twice<br /> C. One-fourth<br /> D. Three times<br /> <br /> 132. A series-parallel combination of identical resistors will<br /> A. Increase the power rating compared with one resistor alone<br /> B. Increase the voltage rating compared with one resistor alone<br /> C. Reduce the voltage rating compared with resistor alone<br /> D. Result in an expensive circuit<br /> <br /> 133. The ___ of an alternating quantity is defined as the fractional part of a period or cycle through which the quantity has advanced from selected origin.<br /> A. Phase<br /> B. Frequency<br /> C. Amplitude<br /> D. Waveform<br /> <br /> 134. An inductive circuit of resistance 16.5 Ω and inductance of 0.14 H takes a current of 25 A. if the frequency is 50 Hz, find the supply voltage.<br /> A. 1501 V<br /> B. 1174 V<br /> C. 1877 V<br /> D. 991 V<br /> <br /> 135. Which of the following has a positive temperature coefficient?<br /> A. Mica<br /> B. Manganin<br /> C. Silicon<br /> D. Carbon<br /> <br /> 136. The ratio of the flux density to the electric field intensity in the dielectric is called<br /> A. Permittivity<br /> B. Field intensity<br /> C. Permeability<br /> D. Elasticity<br /> <br /> 137. It is impossible to change the voltage across a capacitor instantly, as this would produce ___ current.<br /> A. Infinite<br /> B. Zero<br /> C. Low<br /> D. High<br /> <br /> 138. Which of the following is not a factor affecting capacitance of a basic capacitor?<br /> A. Area of plates<br /> B. Number of plates<br /> C. Distance between plates<br /> D. Dielectric material used<br /> <br /> 139. When voltage is applied across a ceramic dielectric the electrostatic field produced is 50 times greater than air dielectric. The dielectric constant of ceramic therefore is<br /> A. 50<br /> B. 100<br /> C. 16.67<br /> D. 5<br /> <br /> 140. The reason why alternating current can induce voltage is<br /> A. It has high peak value<br /> B. It has a stronger magnetic field than direct current<br /> C. It has a constant magnetic field<br /> D. It has a varying magnetic field<br /> <br /> 141. When two unequal values of resistors are connected in parallel across a dc source, greater current flows through the<br /> A. Higher resistance<br /> B. Lower resistance<br /> C. Higher wattage resistance<br /> D. Lower wattage resistance<br /> <br /> 142. A real current source has<br /> A. Infinite internal resistance<br /> B. Zero internal resistance<br /> C. Large internal resistance<br /> D. Small internal resistance<br /> <br /> 143. What is the cross-sectional are of a conductor whose diameter is 0.001 inch?<br /> A. One micron<br /> B. One angstrom<br /> C. One steradian<br /> D. One circular mil<br /> <br /> 144. Which of the following describes the action of a capacitor?<br /> A. Stores electrical energy<br /> B. Opposes changes in current flow<br /> C. Creates a dc resistance<br /> D. Converts ac to dc<br /> <br /> 145. High resistance values are a consequence of the ___ of the film.<br /> A. Thickness<br /> B. Length<br /> C. Thinness<br /> D. Area<br /> <br /> 146. For parallel capacitors, total charge is<br /> A. The sum of individual charges<br /> B. Equal to the charge of either capacitors<br /> C. Equal to the product of the charges<br /> D. The quotient of the charges<br /> <br /> 147. Which waveform in which the rms value and the mean value are equal?<br /> A. Square wave<br /> B. Triangular wave<br /> C. Sine wave<br /> D. Sawtooth<br /> <br /> 148. In a series circuit with unequal resistances the<br /> A. Highest R has the highest V<br /> B. Lowest R has the highest V<br /> C. Lowest R has the highest I<br /> D. Highest R has the highest I<br /> <br /> 149. In a parallel bank with unequal branch resistances<br /> A. The highest R has the highest I<br /> B. The lowest R has the highest V<br /> C. The lowest R has the highest V<br /> D. The highest R has the highest V<br /> <br /> 150. A rheostat is a form of<br /> A. Variable resistor<br /> B. Variable capacitor<br /> C. Potentiometer<br /> D. Thermocouple<br /> <div> <br /> <br /> Click the download button below to download this practice set <i>with answers</i> in PDF format.<br /> <a href="http://sh.st/g0bfK" target="_blank"><img alt="Engineering Reviewer" border="0" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEj1-NjrpCxm6yjAbseWXzXAju2YTydqeOqudQCUdc7hgym5LtE20MCn25TSOjZjV02OCrkKMexBzS7VQClWlabKvR8YlX_gPz4idqAXShssWs9hSM6-Ym3HgwW1V7JJHMyE-X79QK0-KbTU/s1600/dl.png" /></a></div>

MCQs / Engineering Reviewer - Electrical Circuits Part 3

Engineering Reviewer - Electrical Circuits Multiple Choice Questions / Practice Test Electrical Circuits 101. The potential gradient ...

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MCQs / Engineering Reviewer - Electrical Circuits Part 2

<table align="center" cellpadding="0" cellspacing="0" class="tr-caption-container" style="margin-left: auto; margin-right: auto; text-align: center;"><tbody> <tr><td><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEio2WBhu0ZU9NOtyvc0xKg_CpYRRFpIUlDFzrhv2t7U3N7W_82JMeVssBOki2XxG-hyTPuOYAzf5UWZo1xKVtnd6wePsWfKZ0H9p1a_vbmH9LtTBE3xhUubrL-EiFphWE4BaWPPM_YOVhuB/s1600/mcqs-electrical-circuits.jpg" imageanchor="1" style="margin-left: auto; margin-right: auto;"><img alt="MCQs on Electrical Circuits" border="0" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEio2WBhu0ZU9NOtyvc0xKg_CpYRRFpIUlDFzrhv2t7U3N7W_82JMeVssBOki2XxG-hyTPuOYAzf5UWZo1xKVtnd6wePsWfKZ0H9p1a_vbmH9LtTBE3xhUubrL-EiFphWE4BaWPPM_YOVhuB/s1600/mcqs-electrical-circuits.jpg" title="MCQs on Electrical Circuits" /></a></td></tr> <tr><td class="tr-caption" style="font-size: 12.8000001907349px;">Engineering Reviewer - Electrical Circuits</td></tr> </tbody></table> <b>Multiple Choice Questions / Practice Test</b><br /> <b>Electrical Circuits</b><br /> <br /> 51. Effects of capacitance<br /> A. It opposes any change in the amount of voltage<br /> B. Voltage is lagged behind the current by a quarter cycle<br /> C. Electric energy is stored in the capacitor in the form of electrostatic field<br /> D. All of the above<br /> <br /> 52. Points to be considered in choosing a capacitor<br /> A. Working voltage<br /> B. Type of dielectric<br /> C. Capacitance<br /> D. All of the above<br /> <br /> 53. Permeability is otherwise known as<br /> A. Magnetic conductivity<br /> B. Magnetic susceptibility<br /> C. Electric conductivity<br /> D. Electric susceptibility<br /> <br /> 54. The impedance in the study of electronics is represented by resistance and<br /> A. Inductance<br /> B. Capacitance<br /> C. Inductance and capacitance<br /> D. Reactance<br /> <br /> 55. Loop currents should be assumed to flow in which direction<br /> A. Straight<br /> B. Clockwise<br /> C. Counter-clockwise<br /> D. Either B or C arbitrarily selected<br /> <br /> 56. What determines the direction of induced emf in a conductor or coil?<br /> A. Cork screw rule<br /> B. Fleming’s left hand rule<br /> C. Ampere’s circuital law<br /> D. Fleming’s right hand rule<br /> <br /> 57. The reason why electrical appliances are connected in parallel.<br /> A. It is a simple circuit<br /> B. This makes the operation of appliances independent with each other<br /> C. This results in reduced power consumption<br /> D. All of the above<br /> <br /> 58. Which of the following does not affect resistance?<br /> A. Resistivity<br /> B. Cross-sectional area<br /> C. Mass<br /> D. Length<br /> <br /> 59. Which of the following is not considered a physical factor affecting resistance?<br /> A. Length<br /> B. Material type<br /> C. Temperature<br /> D. Cross-sectional<br /> <br /> 60. A 0.09 microfarad capacitor is charged to 220 volts. How long in milliseconds will it discharged resistor has a resistance of 20,000 ohms?<br /> A. 1.5<br /> B. 2.5<br /> C. 1.25<br /> D. 0.5<br /> <br /> 61. A trigger circuit consisting of a capacitor of 0.01 μF is connected in series with a resistor. If the circuit requires 100 V<span style="font-size: xx-small;">dc</span> to operate, determine the value of the resistor when time constant is 0.009s.<br /> A. 900 Ω<br /> B. 900 kΩ<br /> C. 900 MΩ<br /> D. 900 GΩ<br /> <br /> 62. The graph between an alternating quantity and time is called<br /> A. Sine wave<br /> B. Curve<br /> C. Waveform<br /> D. A plot<br /> <br /> 63. Which of the following is the most popular waveform?<br /> A. Sinusoidal<br /> B. Square wave<br /> C. Triangular<br /> D. Sawtooth<br /> <br /> 64. Which of the following does not refer to electrical energy?<br /> A. Volt-ampere<br /> B. Joule<br /> C. Watt-second<br /> D. Volt-coulomb<br /> <br /> 65. What is the resonant frequency of a circuit when L of 25 microhenrys and C of 10 picofarads are in parallel?<br /> A. 10.1 kHz<br /> B. 10.1 MHz<br /> C. 101 MHz<br /> D. 101 kHz<br /> <br /> 66. And ideal current source has an internal conductance of _____ siemen(s)<br /> A. Infinite<br /> B. One<br /> C. Zero<br /> D. One million<br /> <br /> 67. A capacitance of 6 µµF means<br /> A. 6 pF<br /> B. 6 nF<br /> C. 6 fF<br /> D. 6 aF<br /> <br /> 68. The voltage cannot be exactly in phase with the current in a circuit that contains<br /> A. Only capacitance<br /> B. Only resistance<br /> C. Inductance and capacitance<br /> D. Inductance, capacitance and resistance<br /> <br /> 69. The charge in the capacitor is stored at the<br /> A. Terminals<br /> B. Plates<br /> C. Dielectric<br /> D. Air<br /> <br /> 70. The reactance curve is a plot of frequency versus _____ for a series RLC circuit<br /> A. Current<br /> B. Voltage<br /> C. Gain<br /> D. Impedance<br /> <br /> 71. For a series circuit, the higher the quality factor<br /> A. The greater the bandwidth<br /> B. The narrower the passband<br /> C. The broader the resonance curve<br /> D. The wider the passband<br /> <br /> 72. “Any resistance R in a branch of a network in which a current I is flowing can be replaced by a voltage equal to IR”. This states<br /> A. Compensation theorem<br /> B. Reciprocity theorem<br /> C. Millman’s theorem<br /> D. Superposition theorem<br /> <br /> 73. The internal resistance of an ideal current source is<br /> A. Infinite<br /> B. Zero<br /> C. Equal to the load resistance<br /> D. To be determined<br /> <br /> 74. If three 100-pF capacitors are connected in series, then the total capacitance is<br /> A. 300 pF<br /> B. 100 pF<br /> C. 50 pF<br /> D. 33.3 pF<br /> <br /> 75. An inductance of 1 mH is<br /> A. 0.001 H<br /> B. 0.01 H<br /> C. 0.0001 H<br /> D. 0.10 H<br /> <br /> 76. A capacitor is basically constructed of<br /> A. Two conductors separated by a dielectric<br /> B. Two dielectric separated by a conductor<br /> C. Conductors and dielectric<br /> D. Conductors and semiconductors<br /> <br /> 77. In an inductive coil, the rate of rise of current is maximum<br /> A. Near the final maximum value of current<br /> B. At mid-value of current<br /> C. At half-power points<br /> D. After one time constant<br /> <br /> 78. Two complex numbers or phasors are said to be conjugate if they<br /> A. Differ only in the algebraic sign of their quadratic components<br /> B. Differ only in the algebraic sign of their real components<br /> C. Are equal in their real and quadrature components including algebraic signs<br /> D. Are equal in their real components but differ in their quadrature components including algebraic signs.<br /> <br /> 79. In an ac circuit with a resistive branch and an inductive branch in parallel, the<br /> A. Voltage across the inductance leads the voltage across the resistance by 90°<br /> B. Resistive branch current is 90° out of phase with the inductive branch current<br /> C. Resistive and inductive branch currents have the same phase<br /> D. Resistive and inductive branch currents are 180° out-of-phase<br /> <br /> 80. In an ac circuit with X<span style="font-size: xx-small;">L</span> and R in series, the<br /> A. Voltages across R and X<span style="font-size: xx-small;">L</span> are in phase<br /> B. Voltage across R lags the voltage across X<span style="font-size: xx-small;">L</span> by 90°<br /> C. Voltages across R and X<span style="font-size: xx-small;">L</span> are 180° out-of-phase<br /> D. Voltage across R leads the voltage across X<span style="font-size: xx-small;">L</span> by 90°<br /> <br /> 81. Leakage resistance in a capacitor results into<br /> A. Internal heating<br /> B. Internal bleeding<br /> C. Shorter useful life<br /> D. Short-circuiting<br /> <br /> 82. Voltage resonance means<br /> A. Series resonance<br /> B. Parallel resonance<br /> C. Current magnification<br /> D. Gain magnification<br /> <br /> 83. The unit of elastance is<br /> A. Farad<br /> B. Daraf<br /> C. Siemen<br /> D. Henry<br /> <br /> 84. The farad is not equivalent to which of the following combination of units<br /> A. C(V^2)<br /> B. (C^2)/J<br /> C. C/V<br /> D. J/(V^2)<br /> <br /> 85. Which component opposes voltage change?<br /> A. Resistor<br /> B. Inductor<br /> C. Capacitor<br /> D. Transistor<br /> <br /> 86. What is the peak factor for alternating current or voltage varying sinusiodally?<br /> A. 1.4142<br /> B. 0.707<br /> C. 0.636<br /> D. 1.11<br /> <br /> 87. Which of the following is not a factor affecting dielectric strength?<br /> A. Mass<br /> B. Moisture content<br /> C. Temperature<br /> D. Thickness<br /> <br /> 88. The superposition theorem is used when the circuit contains<br /> A. Reactive elements<br /> B. Active elements<br /> C. Number of voltage sources<br /> D. Single voltage source<br /> <br /> 89. What refers to such work at very low temperatures, near absolute zero?<br /> A. Cryogenics<br /> B. Superconductivity<br /> C. Subsonic<br /> D. Thermionic<br /> <br /> 90. A factor that states how much the resistance changes for a change in temperature?<br /> A. Resistivity<br /> B. Specific resistance<br /> C. Coefficient of temperature change<br /> D. Temperature coefficient of resistance<br /> <br /> 91. An alloy composed of 84 % copper, 12 % manganese and 4 % nickel.<br /> A. Manganin<br /> B. Constantan<br /> C. Nichrome<br /> D. German silver wire<br /> <br /> 92. A law which states that when a constant electromotive force is applied to a circuit consisting of a resistor and capacitor connected in series, the time taken for the potential on the plates of the capacitor to rise to any given fraction of its final value depends only on the product of capacitance and resistance.<br /> A. Child’s law<br /> B. CR law<br /> C. Coulomb’s law<br /> D. Debye T3 law<br /> <br /> 93. At parallel resonance, the currents flowing through L and C are<br /> A. Infinite<br /> B. Zero<br /> C. Unequal<br /> D. Equal<br /> <br /> 94. In a rectangular wave, the peak factor is<br /> A. 1.16<br /> B. 1.73<br /> C. 1.11<br /> D. 1.0<br /> <br /> 95. In an RL series circuit,<br /> A. Current lags voltage by less than 90˚<br /> B. Current lags voltage by 180˚<br /> C. Current lags voltage by 90˚<br /> D. Current leads voltage by 90˚<br /> <br /> 96. In a pure capacitance,<br /> A. Current leads voltage by 90˚<br /> B. Current leads voltage by 180˚<br /> C. Current lags voltage by 90˚<br /> D. Current lags voltage by 180˚<br /> <br /> 97. The ohmic value of a resistor with negative temperature coefficient<br /> A. Increases with increasing temperature<br /> B. Increase with decreasing temperature<br /> C. Stays unchanged with temperature change<br /> D. Stays unaffected even with increasing temperature<br /> <br /> 98. Which of the statements below is not true?<br /> A. Current source is an active element<br /> B. Resistor is a linear element<br /> C. Voltage source is a passive element<br /> D. Diode is a non-linear element<br /> <br /> 99. Which of the following elements is active?<br /> A. Resistor<br /> B. Inductor<br /> C. Capacitor<br /> D. Ideal voltage source<br /> <br /> 100. What is the complex impedance of a circuit with an absolute resistance of 300 Ω?<br /> A. 0 + j 300 Ω<br /> B. 300 + j 90 Ω<br /> C. 0 – j 300 Ω<br /> D. 300 + j 0 Ω<br /> <div> <br /> <br /> Click the download button below to download this practice set <i>with answers</i> in PDF format.<br /> <a href="http://sh.st/g0bug" target="_blank"><img alt="Engineering Reviewer" border="0" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEj1-NjrpCxm6yjAbseWXzXAju2YTydqeOqudQCUdc7hgym5LtE20MCn25TSOjZjV02OCrkKMexBzS7VQClWlabKvR8YlX_gPz4idqAXShssWs9hSM6-Ym3HgwW1V7JJHMyE-X79QK0-KbTU/s1600/dl.png" /></a></div>

MCQs / Engineering Reviewer - Electrical Circuits Part 2

Engineering Reviewer - Electrical Circuits Multiple Choice Questions / Practice Test Electrical Circuits 51. Effects of capacitance ...

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MCQs / Engineering Reviewer - Electrical Circuits Part 1

<table align="center" cellpadding="0" cellspacing="0" class="tr-caption-container" style="margin-left: auto; margin-right: auto; text-align: center;"><tbody> <tr><td style="text-align: center;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEio2WBhu0ZU9NOtyvc0xKg_CpYRRFpIUlDFzrhv2t7U3N7W_82JMeVssBOki2XxG-hyTPuOYAzf5UWZo1xKVtnd6wePsWfKZ0H9p1a_vbmH9LtTBE3xhUubrL-EiFphWE4BaWPPM_YOVhuB/s1600/mcqs-electrical-circuits.jpg" imageanchor="1" style="margin-left: auto; margin-right: auto;"><img alt="MCQs on Electrical Circuits" border="0" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEio2WBhu0ZU9NOtyvc0xKg_CpYRRFpIUlDFzrhv2t7U3N7W_82JMeVssBOki2XxG-hyTPuOYAzf5UWZo1xKVtnd6wePsWfKZ0H9p1a_vbmH9LtTBE3xhUubrL-EiFphWE4BaWPPM_YOVhuB/s1600/mcqs-electrical-circuits.jpg" title="MCQs on Electrical Circuits" /></a></td></tr> <tr><td class="tr-caption" style="text-align: center;">Engineering Reviewer - Electrical Circuits</td></tr> </tbody></table> <b>Multiple Choice Questions / Practice Test</b><br /> <b>Electrical Circuits</b><br /> <br /> 1. Conventional flow assumes charges flow from<br /> A. Positive to negative<br /> B. Positive to positive<br /> C. Negative to positive<br /> D. Negative to negative<br /> <br /> 2. Electron flow assumes charges flow from<br /> A. Negative to positive<br /> B. Negative to negative<br /> C. Positive to negative<br /> D. Positive to positive<br /> <br /> 3. Series resonance occurs when<br /> A. XL = XC<br /> B. XL = R<br /> C. Z = R<br /> D. Both A and C<br /> <br /> 4. The symbol Q refers to<br /> A. Resonance quotient<br /> B. Quality factor<br /> C. Power quotient<br /> D. Qualification test<br /> <br /> 5. The ratio of W/VA in an ac circuit means<br /> A. Power factor<br /> B. Reactive factor<br /> C. Quality factor<br /> D. Load factor<br /> <br /> 6. What is the reciprocal of quality factor?<br /> A. Power factor<br /> B. Reactive factor<br /> C. Dissipation factor<br /> D. 1/Q factor<br /> <br /> 7. In liquids and gases, ionization current results from a flow of<br /> A. Positive or negative ions<br /> B. Free electrons<br /> C. Ions that are lighter in weight than electrons<br /> D. Protons<br /> <br /> 8. VL = VC in a series RLC circuit when<br /> A. The value of the impedance is minimum<br /> B. The power factor is zero<br /> C. The current leads the total voltage by 90˚<br /> D. The total voltage is zero<br /> <br /> 9. At what frequency will an inductor of 5mH have the same reactance as a capacitor of 0.1 μF?<br /> A. 7.12 kHz<br /> B. 7.12 Hz<br /> C. 7.12MHz<br /> D. 7.12 GHz<br /> <br /> 10. Property of an electric circuit that dissipates electric energy<br /> A. Reactance<br /> B. Impedance<br /> C. Resistance<br /> D. Conductance<br /> <br /> 11. What is the other name of relative permittivity?<br /> A. Dielectric strength<br /> B. Potential gradient<br /> C. Breakdown voltage<br /> D. Specific inductance capacity<br /> <br /> 12. In a series RLC circuit<br /> A. The current lags VL by 90˚<br /> B. The current leads VL by 90˚<br /> C. X<span style="font-size: xx-small;">L</span> leads X<span style="font-size: xx-small;">C</span> by 90˚<br /> D. Z = <span style="font-size: xx-small;">J</span>X<span style="font-size: xx-small;">L</span> at resonance<br /> <br /> 13. Resistor with colored bands in the body<br /> A. Wire-wound resistor<br /> B. Carbon-composition resistor<br /> C. Potentiometer<br /> D. Rheostat<br /> <br /> 14. In a resonant circuit, if Q ≥ 10 resonant frequency _______ bandwidth.<br /> A. Bisects<br /> B. Exceeds<br /> C. Is less than<br /> D. Is equal to<br /> <br /> 15. Which of the following conditions is not true for a series RLC circuit at resonance?<br /> A. Z = <span style="font-size: xx-small;">J</span>X<span style="font-size: xx-small;">L</span><br /> B. X<span style="font-size: xx-small;">L</span> = X<span style="font-size: xx-small;">C</span><br /> C. The power factor is one<br /> D. The magnitude of Z is √(R^2 + (X<span style="font-size: xx-small;">L</span>-X<span style="font-size: xx-small;">C</span>)^2)<br /> <br /> 16. The current is ____ times the maximum current at half-power points of a resonance curve.<br /> A. 0.707<br /> B. 1.414<br /> C. 0.5<br /> D. 0.632<br /> <br /> 17. A gang capacitor is a variable capacitor in which capacitance is varied by changing the<br /> A. Dielectric<br /> B. Number of plates<br /> C. Plate area<br /> D. Distance between plates<br /> <br /> 18. In an ac circuit with inductive reactance, the<br /> A. Phase angle of the circuit is always 45˚<br /> B. Voltage across the inductance must be 90˚ out-of-phase with the applied voltage<br /> C. Current through the inductance lags its induced voltage by 90˚<br /> D. Current through the inductance and voltage across it are180˚ out-of-phase<br /> <br /> 19. If three 9 mH inductors are connected in parallel without mutual inductance then the total inductance is<br /> A. 3 mH<br /> B. 9 mH<br /> C. 27 mH<br /> D. 18 mH<br /> <br /> 20. What is the specific resistance of a pure germanium?<br /> A. 55 Ω-cm<br /> B. 55 Ω-m<br /> C. 55 Ω-mm<br /> D. 55 kΩ-m<br /> <br /> 21. Two capacitors of capacitance 9 μF and 18 μF in series will have a total capacitance of<br /> A. 27 μF<br /> B. 162 μF<br /> C. 6 μF<br /> D. 180 μF<br /> <br /> 22. In a series RLC circuit<br /> A. Increasing the frequency decreases the resistance<br /> B. Increasing the frequency increases the resistance<br /> C. Both XL and XC change as frequency changes<br /> D. Impedance will always decrease<br /> <br /> 23. A series RLC circuit has a ______ power factor at its half-power points<br /> A. Unity<br /> B. Leading<br /> C. Lagging<br /> D. Either B or C<br /> <br /> 24. Kirchhoff’s laws (KCL and KVL) are applicable to<br /> A. DC circuits<br /> B. AC circuits<br /> C. DC as well as AC circuits<br /> D. Passive networks alone<br /> <br /> 25. A tank circuit is a<br /> A. Parallel LC circuit<br /> B. Series LC circuit<br /> C. A resonant circuit<br /> D. A non-resonant circuit<br /> <br /> 26. A capacitive load always has a ______ power facto<br /> A. Leading<br /> B. Lagging<br /> C. Zero<br /> D. Unity<br /> <br /> 27. What is the temperature coefficient of the resistance Eureka?<br /> A. Infinity<br /> B. Negative<br /> C. Almost zero<br /> D. Positive<br /> <br /> 28. As applied to a series RLC circuit, bandwidth means<br /> A. The frequency range for maximum power transfer<br /> B. The difference between the highest and lowest frequencies of the oscillator<br /> C. The separation of the half-power points<br /> D. The frequency at which X<span style="font-size: xx-small;">L</span> = X<span style="font-size: xx-small;">C</span><br /> <br /> 29. Which is considered as the effect of a dielectric material?<br /> A. Increasing capacitance<br /> B. Decreasing capacitance<br /> C. Reducing the working voltage<br /> D. Increasing the distance between the plates<br /> <br /> 30. The open-circuit voltage at the terminal of load RL is 60V.  Under the condition of maximum power transfer, the load voltage will be<br /> A. 60 V<br /> B. 15 V<br /> C. 20 V<br /> D. 30 V<br /> <br /> 31. If a capacitor is rated for 200V dc, what is its effective ac working voltage?<br /> A. 50 V<br /> B. 100 V<br /> C. 200 V<br /> D. 400 V<br /> <br /> 32. If resonant frequency is 10 kHz and quality factor is 50, then<br /> A. Bandwidth is 200 Hz<br /> B. XL = is 50,000 Ω<br /> C. R is 50 Ω<br /> D. XC = is 50,000 Ω<br /> <div> <br /></div> 33. Which statement is true?<br /> A. A series resonant circuit is of high impedance<br /> B. A parallel resonant circuit is of low impedance<br /> C. A series resonant circuit is inductive if it operates at a frequency higher than the resonant frequency<br /> D. A parallel resonant circuit is inductive if it operates at a frequency higher than the resonant frequency<br /> <br /> 34. What is considered as the most important value of a sine wave?<br /> A. Effective value<br /> B. Peak value<br /> C. Average value<br /> D.  Instantaneous value<br /> <br /> 35. An ac series circuit is composed of a resistance of 20 Ω, inductive reactance of 40 Ω, and a capacitive reactance of 15 Ω. If a current of 1 ampere is flowing, what is the applied voltage<br /> A. 320 V<br /> B. 32 V<br /> C. 220 V<br /> D. 22 V<br /> <br /> 36. An intermittent and non-symmetrical alternating current like that obtained from the secondary winding of an induction coil<br /> A. Faradic current<br /> B. Transient ac current<br /> C. Inductive current<br /> D. Capacitive current<br /> <br /> 37. The value of temperature coefficient (α) is dependent upon<br /> A. The nature of material and temperature<br /> B. The length of material<br /> C. The cross-sectional area of the material<br /> D. The volume of the material<br /> <br /> 38. At what frequency will the current in a series RLC circuit reach its maximum value for an applied voltage of 15 V with R = 500 Ω, L = 100 μH and C = 0.001 μF?<br /> A. 503 kHz<br /> B. 403 kHz<br /> C. 603 kHz<br /> D. 303 kHz<br /> <br /> 39. If two equal resistances connected in series across a certain supply are now connected in parallel across the same supply, the power produced will be _____ that of series connection<br /> A. One-half<br /> B. One-fourth<br /> C. Two times<br /> D. Four times<br /> <div> <br /></div> <div> 40. The voltage lags the current by π/2 cycle in a</div> <div> <div> A. Purely resistive circuit</div> <div> B. Purely inductive circuit</div> <div> C. Purely capacitive circuit</div> <div> D. Circuit containing resistance, capacitance and inductance</div> </div> <div> <br /></div> <div> <div> 41. What is the half-power bandwidth of a parallel resonant circuit which has a resonant frequency of 3.6 MHz and Q of 218?</div> <div> A. 1.65 kHz</div> <div> B. 16.5 MHz</div> <div> C. 16.5 kHz</div> <div> D. 165 kHz</div> <div> <br /></div> <div> 42. Which one of the following elements serves as a protection against overload?</div> <div> A. Fuse</div> <div> B. Switch</div> <div> C. Resistor</div> <div> D. Relay</div> <div> <br /></div> <div> 43. Transient period is considered over after</div> <div> A. 5 τ</div> <div> B. 1 τ</div> <div> C. 100 τ</div> <div> D. 6 τ</div> <div> <br /></div> <div> 44. What rating of a resistor determines its ability to absorb heat?</div> <div> A. Wattage</div> <div> B. Ohmic</div> <div> C. Current</div> <div> D. Voltage</div> <div> <br /></div> <div> 45. An open inductor has</div> <div> A. Zero resistance and infinite inductance</div> <div> B. Infinite resistance and zero inductance</div> <div> C. Infinite resistance and infinite inductance</div> <div> D. Zero resistance and zero inductance</div> <div> <br /></div> <div> 46. What is the reading of an ohmmeter for a shorted capacitor?</div> <div> A. Zero</div> <div> B. Infinity</div> <div> C. k Ω</div> <div> D. M Ω</div> <div> <br /></div> <div> 47. What capacitance exists not through design but simply because two conducting surfaces are relatively close to each other?</div> <div> A. Surge</div> <div> B. Stray</div> <div> C. Natural</div> <div> D. Normal</div> <div> <br /></div> <div> 48. The average value of a triangular or sawtooth wave is _____ times its peak value.</div> <div> A. 0.577</div> <div> B. 0.500</div> <div> C. 0.318</div> <div> D. 0.637</div> <div> <br /></div> <div> 49. A series RLC circuit consists of a 10 Ω resistor in series with L = 10 μH, and C = 100 μF. Determine a new value of I, for which the resonant frequency is one –half the original value.</div> <div> A. 40 μH</div> <div> B. 40 mH</div> <div> C. 40 pH</div> <div> D. 40 nH</div> <div> <br /></div> <div> 50. What is the peak factor of a triangular wave?</div> <div> A. 1.16</div> <div> B. 1.73</div> <div> C. 1.41</div> <div> D. 1.11</div> </div> <div> <br /> <br /> Click the download button below to download this practice set <i>with answers</i> in PDF format.<br /> <a href="http://sh.st/g0beg" target="_blank"><img alt="Engineering Reviewer" border="0" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEj1-NjrpCxm6yjAbseWXzXAju2YTydqeOqudQCUdc7hgym5LtE20MCn25TSOjZjV02OCrkKMexBzS7VQClWlabKvR8YlX_gPz4idqAXShssWs9hSM6-Ym3HgwW1V7JJHMyE-X79QK0-KbTU/s1600/dl.png" /></a></div>

MCQs / Engineering Reviewer - Electrical Circuits Part 1

Engineering Reviewer - Electrical Circuits Multiple Choice Questions / Practice Test Electrical Circuits 1. Conventional flow assumes...

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