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
Amplifiers » Exercise - 127. When current feedback (negative) is applied to an amplifier, its input impedance ......... (a) is decreased (b) is increased (c) remains the same (d) none of the above
Amplifiers » Exercise - 120. The value of negative feedback fraction is always .......... (a) less than 1 (b) more than 1 (c) equal to 1 (d) none of the above
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 - 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