Question

At 3dB cut-off frequency the voltage gain will be __________

(a) 100% of maximum gain

(b) 70.7% of maximum gain

(c) 80.7% of maximum gain

(d) 47.5% of maximum gain

The question was posed to me by my college director while I was bunking the class.

This key question is from General Frequency Consideration in portion Transistor Biasing and Low Frequencies of Analog Circuits

Answer 1

Right option is (b) 70.7% of maximum gain

Explanation: 3dB cut-off frequency is the frequency at which the power becomes half of its maximum value. That is the voltage gain becomes 0.707 times maximum voltage gain.