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# Amplifiers – 1 – 9

41. If the output impedance of an amplifier is Zout without feedback, then with negative voltage feedback, its value will be ………..

(a) Zout/(1+Avmv)
(b) Zout (1+Avmv)
(c) (1+Avmv)/Zout
(d) Zout (1-Avmv)

Explanation
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42. If the input impedance of an amplifier is Zin without feedback, then with negative voltage feedback, its value will be ………..

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

Explanation
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43. Feedback circuit ……… frequency.

(a) is independent of
(b) is strongly dependent on
(c) is moderately dependent on
(d) none of the above

Explanation
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44. The basic purpose of applying negative voltage feedback is to ………

(a) increase voltage gain
(b) reduce distortion
(c) keep the temperature within limits
(d) none of the above

Explanation
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45. If the voltage gain of an amplifier without feedback is 20 and with negative voltage feedback it is 12, then feedback fraction is ……..

(a) 5/3
(b) 3/5
(c) 1/5
(d) 0.033