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Analog Electronics - Engineering

Q1:

In deriving ac equivalent circuit for an amplifier circuit we short circuit

A all resistors

B all transistors

C all inductors

D all capacitors

ANS:D - all capacitors

For AC voltages, capacitor reactance is low and dependence on frequency, it will vary.

But, mostly for AC analysis, we treat capacitor reactance is very less. So, the capacitor behaves as a short circuit.