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# Amplifiers – 1 – 8

36. If voltage gain without feedback and feedback fraction are Av and mv respectively, then gain with negative voltage feedback is ……..

(a) Av/(1-Avmv)
(b) Av/(1+Avmv)
(c) (1+Avmv)/Av
(d) (1 + Av mv) Av

Explanation
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37. The output impedance of an emitter follower is ……..

(a) high
(b) very high
(c) almost zero
(d) low

Explanation
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38. The approximate voltage gain of an amplifier with negative voltage feedback (feedback fraction being mv) is ………

(a) 1/mv
(b) mv
(c) 1 /(1 + mv)
(d) 1 – mv

Explanation
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39. If Av and Afb are the voltage gains of an amplifier without feedback and with negative feedback respectively, then feedback fraction is …….

(a) (1/Av) – (1/Afb)
(b) (1/Av) + (1/Afb)
(c) (Av/Afb) + (1/Av)
(d) (1/Afb) – (1/Av)

Explanation
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40. In the expression for voltage gain with negative voltage feedback, the term 1 + Am mv is known as ……..

(a) gain factor
(b) feedback factor
(c) sacrifice factor
(d) none of the above