Feedback Amplifiers » Exercise – 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
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
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
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
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
Related Posts
Amplifiers » Exercise - 122. The gain of an amplifier without feedback is 100 db. If a negative feedback of 3 db is applied, the gain of the amplifier will become ........ (a) 101.5 db (b) 300 db (c) 103 db (d) 97 db- Feedback Amplifiers » Exercise - 110. 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
- Amplifiers » Exercise - 131. When current feedback (negative) is applied to an amplifier, its output impedance ...... (a) is increased (b) is decreased (c) remains the same (d) none of the above
- Feedback Amplifiers » Exercise - 12. Feedback in an amplifier always helps to : (a) control its output (b) increase its gain (c) decrease its input impedance (d) stabilize its gain
- Feedback Amplifiers » Exercise - 14. 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