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Amplifiers – 1 – 2

6. The overall bandwidth of two identical voltage amplifiers connected in cascade will :

(a) remain the same as that of a single stage
(b) be worse than that of a single stage
(c) be better than that of a single stage
(d)
 be better if stage gain is low and worse if stage gain is high

ANSWER

EXPLANATION

7. Negative feedback in an amplifier :

(a) reduces the voltage gain
(b) increases the voltage gain
(c) does not affect the voltage gain
(d) 
converts the amplifier into an oscillator

ANSWER

EXPLANATION

8. In a voltage shunt negative feedback amplifier system, the input resistance Ri and the output resistance Ro of the basic amplifier are modified as follows :

(a) Ri is decreased and Ro increased
(b) both Ri and Ro are decreased
(c) both Ri and Ro are increased
(d) Ri is increased and Ro is decreased

ANSWER

EXPLANATION

9. A radio frequency signal contains three frequency components, 870 KHz, 875 KHz and 880 KHz. The signal needs to be amplified. The amplifier used should be :

(a) audio frequency amplifier
(b) wide band amplifier
(c) tuned voltage amplifier
(d) push-pull amplifier

ANSWER

EXPLANATION

10. The type of power amplifier which exhibits crossover distortion in its output is :

(a) Class A
(b) Class B
(c) Class AB
(d) 
Class C

ANSWER

EXPLANATION

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