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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

EXPLANATION

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

EXPLANATION

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

EXPLANATION

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

EXPLANATION

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

EXPLANATION

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