Multiple Choice Questions Topic Outline
- MCQs in Semiconductor Fundamentals
- MCQs in Transistor Components
- MCQs in Circuit Analysis and Design
- MCQs in Special Services (Photo Electric, Photo voltaic)
The Series
Following is the list of multiple choice questions in this brand new series:
Continue Practice Exam Test Questions Part 2 of the Series
51. The time taken by the diode to operate in the reversed condition from forward conduction.
- A. Maximum power time
- B. Reverse recovery time
- C. Lifetime
- D. Time allocation
52. Approximately, the atomic weight of germanium is
- A. 32
- B. 28.09
- C. 72.7
- D. 16
53. Atomic weight of silicon at 300 K is
- A. 28.09
- B. 72.7
- C. 5.32
- D. 16
54. An LED and phototransistor is equivalent to a/an
- A. Thermocouple
- B. FET
- C. Optocoupler
- D. Regulator
55. Optocoupler is otherwise known as
- A. Laser
- B. Photodiodes
- C. Optoisolator
- D. Photoconductive cell
56. When the emitter junction is forward biased while the collector junction is reverse biased, the transistor is at ________ region.
- A. Cut-off
- B. Saturation
- C. Active
- D. Breakdown
57. When both emitter and collector junction are forward biased, the transistor is said to be at _________ region.
- A. Active
- B. Cut-off
- C. Breakdown
- D. Saturation
58. An equivalent circuit of a diode in which it is represented as a switch in series with a barrier potential.
- A. First approximation
- B. Second approximation
- C. Third approximation
- D. Fourth approximation
59. Which of the following is the equivalent circuit for a diode for third approximation?
- A. A switch only
- B. A switch in series with a battery in series with a resistance
- C. A switch in series with battery
- D. A switch in series with a resistance
60. A silicon crystal is a/an ___________ of a semiconductor if every atom in the crystal is a silicon atom.
- A. Extrinsic
- B. Intrinsic
- C. P-type
- D. N-type
61. With pnp voltage divider bias, you must use
- A. Ground
- B. Negative power supplies
- C. Positive power supplies
- D. Resistors
62. 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.
- A. 0.236 V, 3.2 V
- B. 4.764 V, 0.236 V
- C. 0.036 V, 4.964 V
- D. 3.21 V, 1.79 V
63. A half-wave signal has a period of
- A. 16.7 ms
- B. 8.3 ms
- C. 16.7 µs
- D. 8.3 µs
64. A full-wave signal has a period of
- A. 16.7 µs
- B. 8.3 µs
- C. 8.3 ms
- D. 16.7 ms
65. When doping increases, ________ of a semiconductor decreases.
- A. Impurity
- B. Conductivity
- C. Bulk resistance
- D. Minority carrier
66. Which of the following has the least noise level?
- A. FET
- B. BJT
- C. Triode
- D. Tetrode
67. Which of the following has the highest input impedance
- A. FET
- B. BJT
- C. MOSFET
- D. Crystal diode
68. The frequency of a half-wave signal is
- A. Twice the line frequency
- B. Equal to the line frequency
- C. One-half of the line frequency
- D. One-fourth the line frequency
69. For a full-wave rectifier, the output frequency
- A. Equals one-half the input frequency
- B. Equals the line frequency
- C. Equals two times the input
- D. Is three times the line frequency
70. The averaged dc voltage of a half wave rectifier circuit is _________ of the value of the peak input voltage.
- A. 63.6%
- B. 31.8%
- C. 4.8%
- D. 6.2%
71. The average dc voltage of a full wave rectifier circuit is __________ of the value of the peak input voltage.
- A. 31.8%
- B. 48.1%
- C. 63.6%
- D. 1%
72. Typical leakage current in a pn junction is in the order of
- A. µA
- B. mA
- C. nA
- D. pA
73. The resistance of a forward biased pn junction is in the order of
- A. Ω
- B. mΩ
- C. µΩ
- D. kΩ
74. The removal by electronic means of one extremity of an input waveform is called ________.
- A. Filtering
- B. Clamping
- C. Amplifying
- D. Clipping
75. Which of the choices below does not describe a clipper circuit?
- A. Limiter
- B. Amplitude selector
- C. Slicer
- D. Baseline stabilizer
76. The varactor diode is also called as
- A. Voltage-variable capacitance
- B. Varicap
- C. Epicap
- D. All of the above
77. What diode has no depletion layer
- A. Varactor
- B. Varistor
- C. Schottky diode
- D. Shockley diode
78. Varistors are used for line filtering to eliminate spikes and dips and is also called
- A. Transient regulator
- B. Transient limiter
- C. Transient filter
- D. Transient suppressor
79. Defined as random motion of holes and free electrons due to thermal agitation
- A. Fission
- B. Fusion
- C. Diffusion
- D. Ionization
80. The temperature coefficient of resistance of a semiconductor is
- A. Positive
- B. Negative
- C. Zero
- D. Infinity
81. 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
- A. Class A
- B. Class B
- C. Class AB
- D. Class C
82. A large signal amplifier which is biased so that current is non zero for less than one-half cycle.
- A. Class AB
- B. Class C
- C. Class A
- D. Class B
83. A class ____ amplifier stage operates with a small forward bias of the transistor so that some collector current flows at all times
- A. A
- B. B
- C. AB
- D. C
84. What factor is shown on a data sheet that tells how much you have to reduce the power of a device?
- A. Power factor
- B. Derating factor
- C. Reactive factor
- D. Reduction factor
85. The time it takes to turn off a forward-biased diode is called the
- A. Forward recovery time
- B. Reverse recovery time
- C. Recombination
- D. Turn-off time
86. A heavily doped semiconductor has
- A. High resistance
- B. No effect on the semiconductor characteristics
- C. More heat dissipation
- D. Low resistance
87. Gallium arsenide, aluminum arsenide and gallium phosphide are classified as
- A. Elementary semiconductor
- B. Secondary semiconductor
- C. Intrinsic material made by doping
- D. Insulators
88. A lightly doped semiconductor has
- A. Low resistance
- B. High resistance
- C. No effect on a semiconductor
- D. More heat dissipated behaviors
89. The property or ability of a material to support charge flow or electron flow
- A. Resistance
- B. Conductance
- C. Resistivity
- D. Permeance
90. What is also known as photodiffusion effect?
- A. Dember effect
- B. Skin effect
- C. Destriau effect
- D. Night effect
91. An effect that occurs within the entire bulk of a semiconductor material rather than in a localized region or junction
- A. Silicon effect
- B. Dember effect
- C. Bulk effect
- D. Destriau effect
92. The creation voltage in a conductor or semiconductor by illumination of one surface
- A. Dember effect
- B. Skin effect
- C. Destriau effect
- D. Night effect
93. What device uses a material catwhisker as its anode and is classified as a hot-carrier diode?
- A. PIN
- B. Point-contact diode
- C. Shockley diode
- D. Crystal diode
94. What is the typical operating current of an LED?
- A. 50 mA
- B. 10 mA
- C. 20 mA
- D. 5 mA
95. At absolute zero temperature, a semiconductor behaves as a/an
- A. Good conductor
- B. Superconductor
- C. Insulator
- D. Variable resistor
96. Avalanche breakdown in a semiconductor takes place
- A. When forward current exceeds a certain value
- B. When potential barrier is reduced to zero
- C. When reverse bias exceeds a certain value
- D. When forward bias exceeds a certain value
97. A cold-cathode glow-discharge diode having a copper anode and a large cathode of sodium or other material.
- A. Tunnel diode
- B. BARITT diode
- C. Anotron
- D. READ diode
98. 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.
- A. IMPATT
- B. TRAPAT
- C. BARITT diode
- D. Esaki diode
99. What electronic circuit converts AC to DC where the DC output peak value can be greater than the AC input peak value?
- A. Voltage multiplier
- B. Rectifier
- C. Clamper
- D. Clipper
100. Which of the item below does not mean a VARACTOR diode?
- A. VOLTACAPS
- B. VARICAPS
- C. Voltage variable capacitors
- D. Variable resistance diode
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