Exercise: Power Amplifiers

Questions for: Power Amplifiers

A ________ power amplifier is limited to use at one fixed frequency.
A:
class A
B:
class B or AB
C:
class C
D:
class D
Answer: C
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In class B operation, the current drawn from a single power supply has the form of ________ rectified signal.
A:
a full-wave
B:
a half-wave
C:
both a full-wave and a half-wave
D:
None of the above
Answer: A
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A heat sink provides ________ thermal resistance between case and air.
A:
a high
B:
a low
C:
the same
D:
None of the above
Answer: B
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A form of class A amplifier having maximum efficiency of ________ uses a transformer to couple the output signal to the load.
A:
90%
B:
78.5%
C:
50%
D:
25%
Answer: C
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In a class A transformer-coupled power amplifier, ________ winding resistance of the transformer determine(s) the dc load line for the circuit.
A:
the ac
B:
the dc
C:
both the ac and dc
D:
neither the ac nor dc
Answer: B
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