Class A output Stage MCQ’s

This set of Electronic Devices & Circuits Multiple Choice Questions & Answers (MCQs) focuses on “Class A output Stage”.

1. The maximum efficiency of resistance loaded class A power amplifier is ____________
a) 5%
b) 35%
c) 25%
d) 50%

2. The maximum efficiency of transformer coupled class A power amplifier is ____________
a) 50%
b) 25%
c) 30%
d) 5%

3. A class A power amplifier uses ______________
a) Two transistors
b) One transistor
c) Three transistors
d) Four transistors

4. Power amplifiers handle ____________ signals compare to voltage amplifiers
a) small
b) large
c) very small
d) equal

5. A power amplifier has comparatively ____________ β.
a) Small
b) Large
c) Very large
d) Same

6. When no signal is applied, the approximate collector efficiency of class A power amplifier is ____________
a) 25%
b) 10%
c) 0%
d) 50%

7. In class A operation, the operating point is generally located ____________ of the d.c. load line.
a) At cut off point
b) At the middle
c) At saturation point
d) In active region

8. A class A power amplifier is sometimes called ____________ amplifier
a) Reciprocating
b) Single – ended
c) Symmetrical
d) Differential

9. The maximum a.c. power output from a class A power amplifier is 10 W. What should be the minimum power rating of the transistor used?
a) 20W
b) 5 W
c) 25W
d) 50W

10. The most costly coupling is ____________ coupling
a) Transformer
b) Impedance
c) RC
d) Direct

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