Exercise: Power Amplifiers

Questions for: Power Amplifiers

You have an oscilloscope across RL and it shows a zero signal voltage. The problem might be that

A:
C3 is open.
B:
BE1 is open.
C:
BE2 is open.
D:
R1 is open.
Answer: A
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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: D
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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: C
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In class B operation, at what fraction of VCC should the level of VL(p) be to achieve the maximum power dissipated by the output transistor?
A:
0.5
B:
0.636
C:
0.707
D:
1
Answer: B
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Which of the following instruments allows more precise measurement of the harmonic components of a distorted signal?
A:
Digital multimeter
B:
Spectrum analyzer
C:
Oscilloscope
D:
Wave analyzer
Answer: D
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