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MCQs

Total Questions : 163 | Page 7 of 17 pages
Question 61. The most important consideration in power amplifier is ___________
  1.    Biasing the circuit
  2.    Collector efficiency
  3.    To keep the transformer cool
  4.    None of the above
 Discuss Question
Answer: Option B. -> Collector efficiency
Question 62. What turn ratio (Np/Ns) of transformer is required to match 4 Ω speaker to a transistor having an output impedance of 8000 O?
  1.    2
  2.    7
  3.    3
  4.    None of the above
 Discuss Question
Answer: Option B. -> 7
Question 63. The size of a power transistor is made considerably large to ___________
  1.    Provide easy handling
  2.    Dissipate heat
  3.    Facilitate connections
  4.    None of the above
 Discuss Question
Answer: Option B. -> Dissipate heat
Question 64. If the power rating of a transistor is 1W and collector current is 100mA, then maximum allowable collector voltage is ___________
  1.    1V
  2.    100V
  3.    20V
  4.    10V
 Discuss Question
Answer: Option D. -> 10V
Question 65. The output stage of a multistage amplifier is also called ___________
  1.    Mixer stage
  2.    Power stage
  3.    Detector stage
  4.    F stage
 Discuss Question
Answer: Option B. -> Power stage
Question 66. Power amplifiers handle ___________ signals compare to voltage amplifiers
  1.    Small
  2.    Very small
  3.    Large
  4.    None of the above
 Discuss Question
Answer: Option C. -> Large
Question 67. For the same a.c. power output as above, what should be the minimum power rating of transistor for class B operation?
  1.    10 W
  2.    4 W
  3.    8 W
  4.    None of the above
 Discuss Question
Answer: Option B. -> 4 W
Question 68. The pulsating d.c. applied to power amplifier causes ___________
  1.    Burning of transistor
  2.    Hum in the circuit
  3.    Excessive forward voltage
  4.    None of the above
 Discuss Question
Answer: Option B. -> Hum in the circuit
Question 69. What will be the collector efficiency of a power amplifier having zero signal power dissipation of 5 watts and a.c. power output of 2 watts?
  1.    20%
  2.    80%
  3.    40%
  4.    50%
 Discuss Question
Answer: Option C. -> 40%
Question 70. A transformer coupled class A power amplifier has a load of 100 Ω on the secondary. If the turn ratio is 10:1, what is the value of load appearing on the primary?
  1.    5 kΩ
  2.    20 kΩ
  3.    100 kΩ
  4.    10 kΩ
 Discuss Question
Answer: Option D. -> 10 kΩ

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