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| ECE Board Exam Reviewer |
ECE Board Exam Reviewer
51. ECE Board Exam March 1996
________ is called an electronic transfer from one stage to the next.
A. Coupling
B. Swamping
C. Doping
D. Mixing
52. ECE Board Exam March 1996
_______ capability is analogous to permeance.
A. Admittance
B. Conductance
C. Reluctance
D. Resistance
53. ECE Board Exam March 1996
Which is a common use for point-contact diode?
A. As a constant current source
B. As a constant voltage source
C. As an RF detector
D. As a high voltage rectifier
54. ECE Board Exam March 1996
Which of the following is not a secondary type cell?
A. Lithium
B. Lead-acid
C. Silver cadmium
D. Silver-zinc
55. ECE Board Exam March 1996
What do you call the piece of equipment in an oscilloscope used to indicate pulse condition in a digital logic circuit?
A. Logic probe
B. Probe
C. Electroscope
D. Galvanometer
56. ECE Board Exam March 1996
How many bits, binary pattern represent the decimal numbers 0 to 9 in binary coded decimal?
A. 4
B. 1
C. 2
D. 8
57. ECE Board Exam March 1996
Which is the principal characteristic of a varactor diode?
A. It has a very high PIV
B. It has a negative resistance region
C. Its internal capacitance varies with the applied voltage
D. It has a constant voltage under conditions of varying current
58. ECE Board Exam March 1996
What is the law whereby the attraction or repulsion between two magnetic poles is directly proportional to their strength?
A. Coulomb’s law
B. Newton’s law
C. Coulomb’s first law
D. Norton’s law
59. ECE Board Exam March 1996
Efficient oscillators are those that are class ________.
A. AB
B. B
C. C
D. A
60. ECE Board Exam March 1996
_______ refers to a circuit that stores pulses and produces an output pulse when specified number of pulses is stored.
A. Counter
B. Register
C. Flip-flop
D. Buffer
61. ECE Board Exam March 1996
How many lithium cells in series are needed for a 12 V battery?
A. 12 cells
B. 4 cells
C. 8 cells
D. 10 cells
62. ECE Board Exam March 1996
_________ is a linear electronic voltage regulator
A. A regulator that has a ramp voltage at its output
B. A regulator in which the control device is switched on or off, with the duty cycle proportional to the line or load conditions
C. A regulator in which the pass transistor switches from the “off” state to the “on” state
D. A regulator in which the conduction of a control element is varied in direct proportion to the voltage or load current.
63. ECE Board Exam March 1996
The particles that make up the lattice in ionic crystal
A. Molecules
B. Ions
C. Electrons
D. Neutron
64. ECE Board Exam March 1996
Parallel cells have the same voltage as one cell but have _______.
A. unstable resistance
B. less current capacity
C. fluctuating power output
D. more current capacity
65. ECE Board Exam March 1996
A digital word consisting of only four bits is called a
A. dibit
B. quad
C. pixel
D. nibble
66. ECE Board Exam March 1996
The reason for the thin layer of varnish over the copper coil pattern is to prevent
A. oxidizing
B. flux
C. corrosion
D. dioxide
67. ECE Board Exam March 1996
_________ is the output voltage of a carbon-zinc cell.
A. 3.5 V
B. 2.5 V
C. 1.5 V
D. 0.5 V
68. ECE Board Exam March 1996
Speed of a logic circuit is normally expressed as ________
A. logic levels
B. speed immunity
C. propagation delay
D. power consumption
69. ECE Board Exam March 1996
_______ is the term used to express the ratio of the change in the dc collector current to a change in base current in a bipolar transistor.
A. Gamma
B. Beta
C. Alpha
D. Delta
70. ECE Board Exam March 1996
_______ refers to a program that translates and then immediately executes statements in a high level language.
A. Interpreter
B. Synchronous
C. Interface
D. Operating system
71. ECE Board Exam March 1996
__________ is the property of magnetic materials which retain magnetism after magnetizing force is withdrawn.
A. Reluctivity
B. Resistivity
C. Retentivity
D. Conductivity
72. ECE Board Exam March 1996
A ________ is a junction field effect transistor with a Schottky barrier instead of a normal semiconductor junction.
A. biFET
B. MOSFET
C. MESFET
D. JUGFET
73. ECE Board Exam March 1996
Term used for response in an electrical circuit.
A. The frequency at which power factor is at a minimum
B. The highest frequency that will pass current
C. The frequency at which capacitive reactance equals inductive reactance
D. The lowest frequency that will pass current
74. ECE Board Exam March 1996
_________ is the progressive decay with time in the amplitude of the free oscillation in a circuit.
A. Decrement
B. Pulse decay time
C. Damping
D. Dancing
75. ECE Board Exam March 1996
What do you call a circuit that changes pure binary code into ASCII?
A. Decoder
B. Encoder
C. Demultiplexer
D. Code converter
76. ECE Board Exam March 1996
Which of the following statement is incorrect?
A. Open transistor has three (3) terminals
B. Transistors have three (3) terminals
C. Potentiometer has three (3) terminals
D. Typical power rating of carbon-composition resistors ranged from 0.001 W to 0.1 W
77. ECE Board Exam March 1996
Which statement is not true?
A. The internal resistance of a cell limits the amount of output current
B. Two electrodes of the same metal provide the highest voltage output
C. Secondary cell can be recharged
D. The negative terminal of a chemical cell has a charge of excess electrons
78. ECE Board Exam March 1996
What type of circuit whose parameters are constant which do not change with voltage of current?
A. Lumped circuit
B. Tuned circuit
C. Reactive circuit
D. Linear circuit
79. ECE Board Exam March 1996
__________ is gaseous tube which uses a pool of liquid mercury as its cathode.
A. Thyratron
B. Phanotron
C. Klystron
D. Ignition
80. ECE Board Exam March 1996
What do you call an electromagnet with its core in a form of magnetic ring?
A. Polarization
B. Irradiation
C. Toroid
D. Doping
81. ECE Board Exam March 1996
_________ is the procedure by which an atom is given a net charge by adding or taking away of electron.
A. Polarization
B. Irradiation
C. Ionization
D. Doping
82. ECE Board Exam March 1996
What do you call an electronic component that is a non-linear resistor and its resistance is function of the voltage across it?
A. Triac
B. IC
C. Varistor
D. Thyristor
83. ECE Board Exam March 1996
Find the half-power bandwidth of a resonant circuit which has a resonant frequency of 1.8 MHz and a Q of 95.
A. 189 Hz
B. 1.89 kHz
C. 58.7 kHz
D. 18.9 kHz
84. ECE Board Exam March 1996
A dynamic memory will store information
A. as long as power is applied to the memory
B. as long as power is applied and the memory is refreshed periodically
C. even when power is not applied to the memory
D. when power is applied at regular intervals
85. ECE Board Exam March 1996
The energy of an oscillator can be source by _________
A. coupling a small coil close to the tube
B. capacitance of inductive coupling from tuned circuit
C. inserting resistor in the grid circuit
D. connecting capacitor across the supply
86. ECE Board Exam March 1996
Refers to that part of computer that interprets and executes instructions
A. ACC
B. ALU
C. CPU
D. Compiler
87. ECE Board Exam March 1996
What is the gain of a vacuum tube having the following parameter amplification factor is 80, external plate-load resistance of 30,000 ohms and the tubes internal plate resistance is 10,000 ohms?
A. 60
B. 20
C. 30
D. 40
88. ECE Board Exam March 1996
__________is the region in a transistor that is heavily doped
A. Collector
B. Ground
C. Base
D. Emitter
89. ECE Board Exam March 1996
Which class of amplifier has the highest linearity and least distortion
A. Class A
B. Class AB
C. Class C
D. Class B
90. ECE Board Exam March 1996
_________ is the unit of reluctance.
A. Gauss
B. Weber
C. Maxwells
D. At/Wb
91. ECE Board Exam March 1996
Find the value of voltage regulation having a dc voltage of 67 V without load and with full load current drawn the output voltage drops to 42 V.
A. 59.5 %
B. 15.9 %
C. 62.6 %
D. 32.5 %
92. ECE Board Exam March 1996
What is the reason why more cells can be stored in a given area with dynamic cells?
A. They consume less power
B. They are smaller
C. They are larger
D. They travel faster
93. ECE Board Exam March 1996
Which of the following is a characteristic of cascaded amplifier?
A. Double each amplifier’s gain
B. Each amplifiers gain is increased
C. Increased overall gain
D. Total gain is decreased
94. ECE Board Exam March 1996
How do you determine if diode is defective?
A. Diode resistance is either very low or very high on either direction
B. High current
C. Very low current
D. High voltage
95. ECE Board Exam March 1996
Avalanche breakdown is primarily dependent on the phenomenon of
A. doping
B. collision
C. recombination
D. ionization
96. ECE Board Exam March 1996
What network facility is used to interconnect distinct networks physically?
A. Relays
B. Routers
C. Repeaters
D. Bridges
97. ECE Board Exam March 1996
Diagram showing procedures which are followed and actions taken is called
A. functional block diagram
B. circuit diagram
C. flow chart
D. schematic diagram
98. ECE Board Exam March 1996
Find the dielectric constant of air
A. Approximately 1
B. Approximately 0
C. Approximately 2
D. Approximately 4
99. ECE Board Exam March 1996
__________ refers to the term remote sensing with regard to a linear voltage regulator.
A. The feedback connection to the error amplifier is made directly to the load
B. The load connection is made outside the feedback loop
C. The error amplifier compares the input voltage to the reference voltage
D. Sensing is accomplished by wireless inductive loops
100. ECE Board Exam March 1996
Transition region refers to ________ with regard to transistor.
A. the area of maximum N-type charge
B. the area maximum P-type
C. the point where wire leads are connected to the P or N type material
D. an area of low charge density around P-N junction
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