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
Tags: feedback, amplifiers, gain, amplifier, db, negative, electronics, engineering
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
Tags: db, amplifiers, gain, amplifier, feedback, negative, electronics, engineering
Amplifiers » Exercise - 145. If the voltage gain of an amplifier without feedback is 20 and with negative voltage feedback it is 12, then feedback fraction is ........ (a) 5/3 (b) 3/5 (c) 1/5 (d) 0.033
Tags: feedback, amplifiers, gain, amplifier, negative, electronics, engineering
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
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Amplifiers » Exercise - 123. If the feedback fraction of an amplifier is 0.01, then voltage gain with negative voltage feedback is approximately ....... (a) 500 (b) 100 (c) 1000 (d) 5000
Tags: amplifiers, feedback, amplifier, gain, negative, electronics, engineering