22. 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 dbSubject Name : Electronics Engineering Exam Name : IIT GATE, UPSC ESE, RRB, SSC, DMRC, NMRC, BSNL, DRDO, ISRO, BARC, NIELIT Posts Name : Assistant Engineer, Management Trainee, Junior Engineer, Technical Assistant Electronics & Communication Engineering Books
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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- 5555555555 41. The midrange open-loop gain of an op-amp is 135 dB. With negative feedback this gain is reduced to 72 dB. The closed-loop gain is ________. (a) 135 dB. (b) 72 dB. (c) 207 dB. (d) 63 dB.
- Amplifiers » Exercise - 262. An amplifiers power is changed from 10 watts to 20 watts. The equivalent AB gain will be : (a) 2 dB (b) 3 dB (c) 6 dB (d) 10 dB
- Amplifiers » Exercise - 133. If voltage feedback (negative) is applied to an amplifier, its output impedance ........ (a) remains the same (b) is increased (c) is decreased (d) none of the above
- 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