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Feedback Amplifiers – 1 – 2

6. Negative feedback in an amplifier :

(a) lowers its lower 3 dB frequency
(b) raises its upper 3 dB frequency
(c) increases its bandwidth
(d) all of the above

ANSWER

EXPLANATION

7. Regarding negative feedback in amplifiers which statement is WRONG ?

(a) it widens the separation between 3 dB frequencies
(b) it increases the gain-bandwidth product
(c) it improves gain stability
(d) it reduces distortion

ANSWER

EXPLANATION

8. Negative feedback reduces distortion in an amplifier only when it :

(a) comes as part of input signal
(b) is part of its output
(c) is generated within the amplifier
(d) exceeds a certain safe level

ANSWER

EXPLANATION

9. The shunt-derived series-fed feedback in an amplifier :

(a) increases its output impedance
(b) decreases its output impedance
(c) increases its input impedance
(d) both (b) and (c)

ANSWER

EXPLANATION

10. The gain of a negative feedback amplifier is 40 dB. If the attenuation of the feedback path is 50 dB, then the gain of the amplifier without feedback is :

(a) 78.92
(b) 146.32
(c) 215.51
(d) 317.23

ANSWER

EXPLANATION

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