List of top Electronics and Communication Engineering Questions on Amplifiers asked in AP PGECET

An amplifier without feedback has a voltage gain of 50, input resistance of 1 k\(\Omega\) and output resistance of 2.5 k\(\Omega\). The input resistance of the current-shunt negative feedback amplifier using the above amplifier with a feedback factor of 0.2, is
What is the role of input capacitance in the transistor amplifying circuit?
A two-stage RC-coupled amplifier has stage-1 lower cutoff frequency \(f_{L1} = 100\text{ Hz}\) and stage-2 lower cutoff frequency \(f_{L2} = 1\text{ kHz}\). The overall lower cutoff frequency of the amplifier is approximately:
Three identical amplifiers with each one having a voltage gain of 50, input resistance of 1 kΩ and output resistance of 250 Ω are cascaded. The open circuit voltage gain of the combined amplifier is
An amplifier has \( A_v = 1000 \pm 100 \). Determine the feedback needed to keep the gain within \( \pm 10\% \).