Feedback Amplifiers – 1 – 1

1. The advantage of using negative feedback in an amplifier is that its gain can be made practically independent of :

(a) temperature changes
(b) age of components
(c) frequency
(d) all of the above

ANSWER
Answer : (d)

EXPLANATION
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2. Feedback in an amplifier always helps to :

(a) control its output
(b) increase its gain
(c) decrease its input impedance
(d) stabilize its gain

ANSWER
Answer : (a)

EXPLANATION
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3. The only drawback of using negative feedback in amplifiers is that it involves :

(a) gain sacrifice
(b) gain stability
(c) temperature sensitivity
(d) frequency dependence

ANSWER
Answer : (a)

EXPLANATION
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4. Closed-loop gain of a feedback amplifier is the gain obtained when :

(a) its output terminals are closed
(b) negative feedback is applied
(c) feedback loop is closed
(d) feedback factor exceeds unity

ANSWER
Answer : (c)

EXPLANATION
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5. A large sacrifice factor in a negative feedback amplifiers leads to :

(a) inferior performance
(b) increased output impedance
(c) characteristics impossible to achieve without feedback
(d) precise control over output

ANSWER
Answer : (c)

EXPLANATION
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