Amplifiers – 2 – 1

51. It is most necessary to control signal-to-noise ratio at ……..

(a) initial stage
(b) driver stage
(c) output stage
(d) detector stage

ANSWER
Answer : (a)

EXPLANATION
No answer description available for this question. Let us discuss.

52. In order to obtain good gain stability in a negative voltage feedback amplifier (Av = voltage gain without feedback ; mv = feedback fraction), ………….

(a) Av mv = 1
(b) Av mv >> 1
(c) Av mv < 1
(d) none of the above

ANSWER
Answer : (b)

EXPLANATION
No answer description available for this question. Let us discuss.

53. Emitter follower is also known as ………

(a) grounded emitter circuit
(b) grounded base circuit
(c) grounded collector circuit
(d) none of the above

ANSWER
Answer : (c)

EXPLANATION
No answer description available for this question. Let us discuss.

54. The bandwidth of an audio amplifier extends from 20Hz to :

(a) 2000 Hz
(b) 10000 Hz
(c) 20000 Hz
(d) 100,000 Hz

ANSWER
Answer : (c)

EXPLANATION
No answer description available for this question. Let us discuss.

55. Which of the following contributes to harmonics distortion in amplifiers :

(a) Positive feedback
(b) Presence of noise
(c) Defective active device
(d) Non-linearity in active device

ANSWER
Answer : (d)

EXPLANATION
No answer description available for this question. Let us discuss.

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