Question

What is the total voltage gain of a cascading transistor amplifier if input of first stage is 10V and the output of the second stage is 25V?

(a) 0.4

(b) 4

(c) 40

(d) 2.5

The question was asked during an interview.

Asked question is from Cascading Transistor Amplifiers topic in chapter Low Frequency Transistor Amplifier Circuit of Electronic Devices & Circuits

Answer 1

The correct answer is (d) 2.5

The best I can explain: The total gain of a cascading transistor amplifier is the ration of the output of second stage amplifier to the input of first stage amplifier. Where, Voutput = 25V and Vinput = 10V.

AV = Voutput / Vinput = 25V / 10V = 2.5