Exercise: Power Amplifiers

Questions for: Power Amplifiers

What is the maximum efficiency of a class B circuit?
A:
90%
B:
78.5%
C:
50%
D:
25%
Answer: B
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A class C amplifier has a tank circuit in the output. The amplifier is conducting only 28°. The output voltage is
A:
0 V.
B:
a dc value equal to VCC.
C:
a sine wave.
D:
a square wave with a frequency determined by the tank.
Answer: C
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Determine VB1.

A:
0 V
B:
0.7 V
C:
9.3 V
D:
10.7 V
Answer: D
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nMOS and pMOS transistors can be used for class B.
A:
True
B:
False
C:
D:
Answer: A
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The class ________ amplifier is biased below cutoff.
A:
A
B:
AB
C:
B
D:
C
Answer: D
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