Amplifiers – Exercise – 2

Amplifiers » Exercise – 2

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
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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
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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
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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
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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
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