Power Amplifiers Questions and Answers

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Showing 10 of 55 questions
Q11
What is the maximum temperature rating for silicon power transistors?
  • A 50º to 80º
  • B 100º to 110º
  • C 150º to 200º
  • D 250º to 300º
Answer: Option C
Q12
What is the maximum efficiency of a class A circuit with a direct or series-fed load connection?
  • A 90%
  • B 78.5%
  • C 50%
  • D 25%
Answer: Option D
Q13
Which class of amplifier operates in the linear region for only a small part of the input cycle?
  • A A
  • B B
  • C C
  • D AB
Answer: Option C
Q14
The Q-point is at cutoff for class ________ operation.
  • A A
  • B B
  • C C
  • D AB
Answer: Option B
Q15
Determine what maximum dissipation will be allowed for a 70-W silicon transistor (rated at 25ºC) if derating is required above 25ºC by a derating factor of 0.6 W/ºC at a case temperature of 100º.
  • A 25 W
  • B 30 W
  • C 35 W
  • D 40 W
Answer: Option A
Q16
How many transistors must be used in a class B power amplifier to obtain the output for the full cycle of the signal?
  • A 0
  • B 1
  • C 2
  • D 3
Answer: Option C
Q17
What transformer turns ratio is required to match an 8- speaker load so that the effective load resistance seen at the primary is 12.8 k?
  • A 20:1
  • B 40:1
  • C 50:1
  • D 60:1
Answer: Option B
Q18
Which of the following is (are) power amplifiers?
  • A Class A
  • B Class B or AB
  • C Class C or D
  • D All of the above
Answer: Option D
Q19
Quiescent power is the power dissipation of a transistor
  • A with no signal input.
  • B with no load.
  • C under full load.
  • D along the dc load line.
Answer: Option A
Q20
Which of the power amplifiers is not intended primarily for large-signal or power amplification?
  • A Class A
  • B Class B or AB
  • C Class C
  • D Class D
Answer: Option C

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