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| ECE Board Exam Reviewer |
ECE Board Exam Reviewer
1. ECE Board Exam March 1996
What is a group of circuits that provides timing and signals to all operation in the computer?
A. Output unit
B. Memory unit
C. Control unit
D. Input unit
2. ECE Board Exam March 1996
Where does voltage generated in a DC generator depend?
A. Field resistance and flux
B. Field and armature currents
C. Flux and speed
D. Speed and field resistance
3. ECE Board Exam March 1996
__________ is the most influential factor in the switching speed of saturated bipolar transistor
A. Charge stored
B. Collector current
C. HFE
D. Base current
4. ECE Board Exam March 1996
What is a pi-network?
A. A Power Incidence Network
B. A network consisting of one inductor and two capacitors or two inductors and one capacitor
C. A network consisting entirely of four inductors or four capacitors
D. An antenna matching network that is isolated form ground
5. ECE Board Exam March 1996
__________ is the property of a material which opposes creation of magnetic flux?
A. Resistance
B. Permeance
C. Reluctance
D. Conductance
6. ECE Board Exam March 1996
The purpose of cells connected in parallel is to
A. increase internal resistance
B. increase voltage output
C. decrease current capacity
D. increase current capacity
7. ECE Board Exam March 1996
What does SI magnetic flux refer?
A. Weber
B. Flux
C. Maxwell
D. Lines
8. ECE Board Exam March 1996
__________ is a type of linear regulator used in applications requiring efficient utilization of the primary power source.
A. A series regulator
B. A shunt regulator
C. A constant current source
D. A shunt current source
9. ECE Board Exam March 1996
When a switch is closed, it has a total resistance of
A. 1000 ohms at room temperature
B. unstable
C. infinity
D. zero
10. ECE Board Exam March 1996
How many turns are needed to produce a magnetizing force of 5000 A.t. for a coil of 50 amperes?
A. 1,000 turns
B. 5,000 turns
C. 100 turns
D. 500 turns
11. ECE Board Exam March 1996
When an SCR is triggered or on condition, its electrical characteristics are similar to what other solid-state device (as measured between its cathode and anode)?
A. The junction diode
B. The varactor diode
C. The tunnel diode
D. The hot-carrier diode
12. ECE Board Exam March 1996
What special type of diode is capable of both amplification and oscillation?
A. Point contact diode
B. Junction diode
C. Zener diode
D. Tunnel diode
13. ECE Board Exam March 1996
A static memory generally contains
A. electrons
B. positive ions
C. row decoders
D. holes
14. ECE Board Exam March 1996
Which is the majority carrier in an N-type semiconductor?
A. Electrons
B. Positive ions
C. Negative ions
D. Holes
15. ECE Board Exam March 1996
Steel is hard to magnetize because of its _______.
A. high retentivity
B. low permeability
C. high permeability
D. high density
16. ECE Board Exam March 1996
When you increase the resistance in a circuit, the flows of electrons will ______
A. flow faster
B. be constant
C. be decreased
D. be stopped
17. ECE Board Exam March 1996
Current in a chemical cell refers to the movement of ________
A. negative ions only
B. negative and positive ions
C. positive ions only
D. negative hole charge
18. ECE Board Exam March 1996
What is the effect of light in a photodiode?
A. Reverse current
B. Limits flow of current
C. Forwards current
D. Renders unstable current
19. ECE Board Exam March 1996
What is the effect in terms of bandwidth when the Q of a single-tune stage is doubled?
A. Doubled
B. The same
C. Halved
D. Four times
20. ECE Board Exam March 1996
___________ is the dc motor control senses.
A. Resistance
B. Counter emf
C. Field voltage
D. Armature current
21. ECE Board Exam March 1996
What is the range of voltage rating available in zener diodes?
A. 2.4 volts to 200 volts
B. 1.2 volts to 7 volts
C. 3 volts to 2000 volts
D. 1.2 volts to 5.6 volts
22. ECE Board Exam March 1996
Find which type of network provides the greatest harmonic suppression.
A. Pi-network
B. Pi-L-network
C. Inverse-Pi-network
D. L-network
23. ECE Board Exam March 1996
What type of transformer that is used to protect technicians and operators from deadly electrical shock?
A. Absorber transformer
B. Step-down transformer
C. Step-up transformer
D. Isolation transformer
24. ECE Board Exam March 1996
What is residual magnetism?
A. The external magnetic field when the current is flowing through the exciting coil.
B. The flux density, which exist in the iron core when the magnetic field intensity is reduced to zero.
C. The flux density, which exist in the iron core when the magnetic field intensity is at its maximum value.
D. The flux density when the magnetic core is saturated.
25. ECE Board Exam March 1996
When batteries have cells connected in series the effect is
A. reduced output voltage
B. increased current supply
C. increased voltage supply
D. reduced internal resistance
26. ECE Board Exam March 1996
How many OP-AMPS does window comparator require?
A. 2
B. 4
C. 3
D. 1
27. ECE Board Exam March 1996
What is the memory element used in clocked sequential logic circuit?
A. Gates
B. Flip-flop
C. Static-RAM
D. Read-only memory
28. ECE Board Exam March 1996
Semiconductors which are considered to be “low power” or “small signal” usually have power dissipation ratings of
A. 1 watt or less
B. 5 watts or less
C. exactly 1 watt
D. 10 watt or less
29. ECE Board Exam March 1996
________ for a transistor to be cut-off
A. Maximum current flows from emitter to collector
B. The transistor is at its operating point
C. No current flows from emitter to collector
D. There is no base current
30. ECE Board Exam March 1996
A __________ is an instruction in a source language that is to be replaced by a defined sequence of instructions in the same source language
A. statement
B. source code
C. mnemonic
D. macro-instruction
31. ECE Board Exam March 1996
Common-base (CB) amplifier has ______ compared to common-emitter and common collector amplifiers.
A. a higher input resistance
B. a larger current gain
C. a lower input resistance
D. a larger voltage gain
32. ECE Board Exam March 1996
_________ currents are wasteful currents which flow in cores of transformers and produces heat.
A. Residual
B. Eddy
C. Sneak
D. Magnetizing
33. ECE Board Exam March 1996
Which of the following photocell is most sensitive to?
A. Radio waves
B. Sound waves
C. Light waves
D. Heat waves
34. ECE Board Exam March 1996
What is the resonant frequency of a circuit when L of 1 microhenry and C of 10 picofarads are in series?
A. 15.9 MHz
B. 50.3 MHz
C. 15.9 MHz
D. 50.3 kHz
35. ECE Board Exam March 1996
What is the law that determines polarity of an induced voltage?
A. Norton’s Law
B. Thevenin’s Law
C. Lenz Law
D. Faraday’s Law
36. ECE Board Exam March 1996
The science of physical phenomena at very low temperatures, approaching absolute zero is called ____________
A. Crytanalysis
B. Cybernetics
C. Temperature inversion
D. Cryogenics
37. ECE Board Exam March 1996
If a dry cell has an internal resistance of 0.50 ohm and an emf of 2 volts, find power delivered in a one ohm resistor?
A. 1.33 watts
B. 1.66 watts
C. 3.66 watts
D. 1.77 watts
38. ECE Board Exam March 1996
What happens in the resistance of copper wired when its temperature is raised?
A. Decreased
B. Steady
C. Increase
D. Zero
39. ECE Board Exam March 1996
Refers to the part of computer that performs mathematical operations
A. CPU
B. Flip-flop
C. Assembly Language
D. ALU
40. ECE Board Exam March 1996
________ is called a memory device which holds fixed set of data in a circuit.
A. RAM
B. Register
C. Logic
D. ROM
41. ECE Board Exam March 1996
When a voltage of 100 V at 50 Hz is applied to a choking coil A, the current taken is 8A and the power is 120 W, when applied to a coil B, the current is 10 A and the power is 120 W. What power will be taken when 100 V is applied to the two coils connected in series?
A. 4737 W
B. 140 W
C. 70 W
D. 1454 W
42. ECE Board Exam March 1996
The current needed to operate a soldering iron which has a rating of 600 watts at 110 volts is
A. 5.455 A
B. 66,000 A
C. 18,200 A
D. 182 A
43. ECE Board Exam March 1996
An interval required to address and read out memory word
A. Propagation delay
B. Pulse duration
C. Settling time
D. Access time
44. ECE Board Exam March 1996
When a logic circuit rejects an unwanted signal, this is termed as ________
A. logic levels
B. noise margin
C. power consumption
D. propagation delay
45. ECE Board Exam March 1996
What is responsible for the phenomenon when voltages across reactances in series can often be larger than the voltage applied to them?
A. Capacitance
B. Resistance
C. Conductance
D. Resonance
46. ECE Board Exam March 1996
How many symbols do hexadecimal digital number system used?
A. 16
B. 4
C. 8
D. 32
47. ECE Board Exam March 1996
What is the equivalent of decimal 47 in binary?
A. 111011
B. 111101
C. 110111
D. 101111
48. ECE Board Exam March 1996
What is the logic circuit having two or more inputs but only one output with high output if any or all inputs are high, with low output only when all inputs are low?
A. AND gate
B. OR gate
C. NOR gate
D. NAND gate
49. ECE Board Exam March 1996
Determine which is not a dynamic test instrument
A. Oscilloscope
B. Logic monitor
C. Logic
D. Logic
50. ECE Board Exam March 1996
How much voltage regulation does commercial power supply have?
A. 10% and above
B. Within 1%
C. 15% and above
D. 10%
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