Class B Output Stage MCQ’s

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

1. A 2-transistor class B power amplifier is commonly called ________ amplifier
a) Dual
b) Single ended
c) Push-pull
d) Differential

2. When a transistor is in cut off________
a) Maximum voltage appears across transistor
b) Maximum voltage appears across load
c) Maximum current flows
d) Least current flows

3. The maximum collector efficiency of class B operation is ________
a) 50%
b) 25%
c) 30%
d) 5%

4. The output stage of a multistage amplifier usually employs ________
a) Push-pull amplifier
b) Preamplifier
c) Class A power amplifier
d) Class B power amplifier

5. The maximum a.c. power output from a class B power amplifier is 10 W.
What should be the minimum power rating of the transistor used?
a) 10W
b) 15W
c) 4W
d) 20W

6. The disadvantage of impedance matching is that it ________
a) Gives distorted output
b) Gives low power output
c) Requires a transformer
d) None of the mentioned

7. The size of a power transistor is made considerably large to ________
a) Provide easy handling
b) Dissipate heat
c) Facilitate connections
d) Larger Gain

8. The push-pull circuit must use ________ operation.
a) Class A
b) Class B
c) Class C
d) Class AB

9. The Power amplifiers generally use transformer coupling because the transformer permits ________
a) Cooling of the circuit
b) Impedance Matching
c) Distortion less Output
d) Good Frequency Response

10. The most important consideration in power amplifier is ________
a) Biasing the circuit
b) Impedance Matching
c) Collector Efficiency
d) To keep the transformer cool

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