Multiple Choice Questions Topic Outline
- MCQs in Amplifiers
- MCQs in Oscillators
- MCQs in Rectifier
- MCQs in Filters
- MCQs in Voltage Regulation
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. A type of oscillator wherein the frequency is determined by the charge and discharge of resistor-capacitor networks used in conjunction with amplifiers or similar devices.
- A. Sine wave oscillator
- B. Beta generating circuit
- C. Relaxation oscillator
- D. Simply an oscillator
52. The driver transformer has center- tapped secondary to provide
- A. Forward bias to transistors of push-pull circuit
- B. Two signals 180 degrees out of phase to transistors of push-pull circuit
- C. Impedance matching
- D. Two signals in phase with each other
53. What is the advantage of RC coupling scheme?
- A. Good impedance matching
- B. Economy
- C. High efficiency
- D. Simplicity
54. A type of filter which is having a single continuous transmission band with neither the upper nor the lower cut-off frequencies being zero or infinite is called
- A. Band stop filter
- B. Low pass filter
- C. High pass filter
- D. Band pass filter
55. An instrument use to measure ones location in terms of coordinates
- A. GPS
- B. ILS
- C. FANS
- D. GSM
56. Transformer coupling is used for _________ amplification.
- A. Current
- B. Power
- C. Voltage
- D. Signal
57. What is the typical value of coupling capacitor Cc in RC coupling?
- A. About 100 pF
- B. About 0.1µF
- C. About 10 µF
- D. About 0.01µF
58. An electronic transfer from one stage to the next is termed as ________
- A. Doping
- B. Mixing
- C. Coupling
- D. Connecting
59. An amplifier configuration where the input signal is led to the emitter terminal and the output from the collector terminal is called
- A. Common base
- B. Common emitter
- C. Clipper
- D. Common collector
60. If the noise factor of an ideal amplifier expressed in dB, then it is
- A. 0
- B. 0.1
- C. 1
- D. 10
61. A feedback circuit is ________ frequency
- A. Independent of
- B. Strongly dependent on
- C. Moderately dependent on
- D. Relatively dependent on
62. What is the basic purpose of applying negative feedback to an amplifier?
- A. To increase gain
- B. To reduce distortion
- C. To keep the temperature within limits
- D. To increase input signal
63. The capacitors are considered __________ in the dc equivalent circuit of a transistor amplifier.
- A. Short
- B. Partially short
- C. Open
- D. Partially open
64. Which frequency produces the highest noise factor?
- A. 10 kHz
- B. 500 Hz
- C. 1 kHz
- D. 100 Hz
65. Power amplifiers handle __________ signals.
- A. Very small
- B. Small
- C. Large
- D. Very large
66. The operating point is generally located at _________ of dc load line in class A operation
- A. The middle
- B. Saturation point
- C. Cut off point
- D. End point
67. Which of the following describes a common collector amplifier?
- A. Low voltage gain
- B. Low current gain
- C. Low power gain
- D. Low input resistance
68. The general characteristics of a common base amplifier are
- A. High voltage gain, low current gain, high power gain and very low input resistance
- B. High voltage, high current gain, high power gain and low input resistance
- C. Low voltage gain, high current gain, very high power gain and low input resistance
- D. None of the choices
69. To amplify dc signals, multistage amplifier uses what coupling?
- A. RC
- B. Direct
- C. Transformer
- D. Resistor
70. What oscillator is used on order to produce frequencies in the microwave region?
- A. Wien bridge
- B. Hartley
- C. Klystron
- D. Crystal
71. Practically, the voltage gain of an amplifier is expressed
- A. In volts unit
- B. In dB unit
- C. As an absolute value
- D. As a whole number
72. What coupling provides maximum voltage gain?
- A. RC
- B. Direct
- C. Transformer
- D. Resistor
73. The gain of an amplifier __________ when negative feedback is added.
- A. Increases
- B. Remains unchanged
- C. Reduces
- D. Becomes infinite
74. Feedback factor is always
- A. Less than 1
- B. Equal to 1
- C. More than 1
- D. Zero
75. What class of operation is used for general amplification where no distortion can be tolerated?
- A. Class A
- B. Class B
- C. Class AB
- D. Class C
76. What class of operation is used either where the signal needs to be cut in half, such as in pulse detector or noise detectors or where push-pull operation of two stages is required?
- A. Class A
- B. Class B
- C. Class AB
- D. Class C
77. What class of operation is used where a portion of a signal only is required, such as the synchronizing pulse separator of a television receiver?
- A. Class A
- B. Class B
- C. Class AB
- D. Class C
78. What class of operation has little use in general purpose amplifiers, but is used in high frequency oscillators?
- A. Class A
- B. Class AB
- C. Class B
- D. Class C
79. Why is transformer coupling provides high frequency?
- A. DC resistance is low
- B. Collector voltage is stepped up
- C. Collector voltage is stepped down
- D. AC resistance is high
80. For constant- K high-pass filter cut-off frequency (in Hz) is given by
- A.
- B.
- C.
- D.
81. Class C operation can have ________ percent efficiency.
- A. 100%
- B. 78.5%
- C. 50%
- D. 70%
82. The efficiency of class AB operation has a maximum of between ________ percent.
- A. 90 to 100%
- B. 60 to 80%
- C. 50 to 78.5%
- D. 40.5 to 60%
83. Transformer coupling is generally employed when load resistance is
- A. Large
- B. Very large
- C. Small
- D. Zero
84. A dc voltage supply provides 60V when the output is unloaded. When connected to a load the output drops to 56V. Calculate the value of the voltage regulation.
- A. 8.1%
- B. 7.1%
- C. 5%
- D. 12%
85. The __________ the voltage regulation, the better the operation of the voltage supply circuit.
- A. Smaller
- B. Bigger
- C. Moderate
- D. Biggest
86. In transistor amplifiers, what transformer is used for impedance matching?
- A. Step up
- B. Power
- C. Step down
- D. Isolation
87. If an amplifier has a power gain of 100, then its dB gain is
- A. 10
- B. 40
- C. 20
- D. 100
88. In order to have more voltage gain from a transformer amplifier the transistor used should have
- A. Thin collector
- B. Thin base
- C. Wide emitter
- D. Thin emitter
89. The final stage of an amplifier uses _______ coupling.
- A. Direct
- B. RC
- C. Transformer
- D. Impedance
90. The largest theoretical voltage gain obtained with a common collector amplifier is
- A. 100
- B. 10
- C. Unity
- D. Infinite
91. Increasing the overall Beta is an advantage of
- A. Clap oscillator
- B. Crystal oscillator
- C. Darlington pair
- D. CE amplifier
92. The frequency of oscillation is __________ L and C in an LC oscillator.
- A. Inversely proportional to square root of
- B. Directly proportional to
- C. Independent of the values of
- D. Proportional to square of
93. An oscillator employs _________ feedback.
- A. Positive
- B. Negative
- C. Both positive and negative
- D. Neither positive nor negative
94. What is the reason why RC coupling is not used to amplify extremely low frequencies?
- A. There is considerable power loss
- B. Electrical size of coupling capacitor becomes very large
- C. There is a hum in the output
- D. Electrical size of coupling capacitor becomes very small
95. Given three amplifiers with a gain of 10 and are connected in cascade. How much is the overall gain?
- A. 24
- B. 10,000
- C. 30
- D. 20
96. A pair of filter common on high fidelity system which separate audio frequency band signals into two separate groups, where one is fed to the tweeter and the other to the woofer is called
- A. Equalizer
- B. Synthesizer
- C. Cross over network
- D. Hybrid
97. The frequency response of transformer coupling is
- A. Good
- B. Excellent
- C. Poor
- D. Very good
98. The simplest variable frequency sinusoidal oscillator is the
- A. Complicated Colpitts circuit
- B. Crystal circuit
- C. Armstrong circuit
- D. Phase shift circuit
99. Which of the following is provided by a CB transistor amplifier?
- A. Voltage gain
- B. Power gain
- C. Current gain
- D. Gain stability
100. In the initial stages of a multistage amplifier, ________ coupling is used.
- A. Link
- B. RC
- C. Transformer
- D. Impedance
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