Power Amplifiers Questions and Answers

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Q31
Which of the following describe(s) a power amplifier?
  • A It can handle large power.
  • B It can handle large current.
  • C It does not provide much voltage gain.
  • D All of the above
Answer: Option D
Q32
Categorize the power efficiency of each class of amplifier, from worst to best.
  • A A, B, AB, D
  • B A, AB, D, B
  • C A, AB, B, D
Answer: Option C
Q33
In a class AB amplifier, if the VBE drops are not matched to the diode drops or if the diodes are not in thermal equilibrium with the transistors, this can result in
  • A a current mirror.
  • B diode separation.
  • C crossover distortion.
  • D thermal runaway.
Answer: Option D
Q34
The least efficient amplifier among all classes is
  • A class B.
  • B class A.
  • C class AB.
  • D class C.
Answer: Option B
Q35
In practice, the efficiency of a capacitively coupled class A amplifier is about ________%.
  • A 25
  • B 40
  • C 70
  • D 10
Answer: Option D
Q36
A class A amplifier has a voltage gain of 30 and a current gain of 25. What is the power gain?
  • A 30
  • B 25
  • C 1.2
  • D 750
Answer: Option D
Q37
Which of the following transistors has been quite popular as the driver device for class D amplification?
  • A BJT
  • B FET
  • C UJT
  • D MOSFET
Answer: Option D
Q38
Which of the following is (are) the disadvantage(s) of a class B complementary-symmetry circuit?
  • A It needs two separate voltage sources.
  • B There is crossover distortion in the output signal.
  • C It does not provide exact switching of one transistor off and the other on at the zero-voltage condition.
  • D All of the above
Answer: Option D
Q39
Which of the power amplifiers has the lowest overall efficiency?
  • A Class A
  • B Class B or AB
  • C Class C
  • D Class D
Answer: Option A
Q40
Calculate the efficiency of a class B amplifier for a supply voltage of VCC = 20 V with peak output voltage of VL(p) = 18 V. Assume RL = 16.
  • A 78.54%
  • B 75%
  • C 70.69%
  • D 50%
Answer: Option C

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