1. Which of the following amplifier class have highest linearity and lowest distortion?
a) Class A
b) Class B
c) Class C
d) Class B push-pull
Answer
Answer: a [Reason:] Class A amplifier have highest linearity and lowest distortion.
2. Which of the following letter is not used to represent a class?
a) D
b) B
c) C
d) E
Answer
Answer: d [Reason:] There is no amplifier called Class E. There are only A, B, C, D, G, H, S.
3. Which of the following letter is not used to represent a class?
a) I
b) H
c) G
d) S
Answer
Answer: a [Reason:] There is no amplifier called Class I. There are only A, B, C, D, G, H, S are present.
4. Which of the following class has poorest linearity
a) Class A
b) Class B
c) Class C
d) Class AB
Answer
Answer: c [Reason:] Class C amplifier have poorest linearity since I only take < 180-degree oscillation.
5. Which of the following amplifier cannot be used for audio frequency amplification?
a) Class A
b) Class C
c) Class AB
d) Class B push-pull
Answer
Answer: b [Reason:] Class C amplifier cannot be used for audio frequency amplifiers because of its high distortion.
6. Which of the following amplifier is less efficient than others?
a) Class C
b) Class B
c) Class A
d) Class AB
Answer
Answer: c [Reason:] Class A is less efficient than other type it is the primitive type.
7. Which of the following amplifier is designed to operate in digital pulses?
a) Class D
b) Class C
c) Class AB
d) Class B
Answer
Answer: a [Reason:] Class D amplifiers are designed to operate on digital filters while C, AB, B can only amplify analog signal.
8. Which of the following class have a theoretical efficiency of 50%?
a) Class A
b) Class C
c) Class AB
d) Class D
Answer
Answer: a [Reason:] Class A amplifier have theoretical efficiency of 50%. 50% of the energy supplied is a waste.
9. Which of the following class have a theoretical efficiency of 78.5%?
a) Class A
b) Class D
c) Class C
d) Class B
Answer
Answer: d [Reason:] Class B amplifier have a theoretical efficiency of 78.5% which higher than Class A while Class D theoretically have efficiency of 100%.
10. Which of the following amplifier is most suited for making tuning circuits?
a) Class A
b) Class B
c) Class C
d) Class D
Answer
Answer: c [Reason:] Class C is most suitable amplifier type for tuning circuit and radio frequency amplification. It employs filtering and hence the final signal is completely acceptable. Class C amplifiers are quite efficient than other types.
