Electronic Devices and Circuits - Engineering

Q1:

An amplifier without feedback has a voltage gain of 50, input resistance of 1 kΩ and output resistance of 2.5 kΩ. The input resistance of the current shunt -ve feedback amplifier using the above amplifier with a feedback factor of 0.2 is

A 1/11 kΩ

B 1/5 kΩ

C 5 kW

D 11 kW

ANS:A - 1/11 kΩ

Input Resistance with feedback for current shunt, .