When an n-p-n junction transistor is used as an amplifier in common emitter mode, (a) the base emitter junction is reverse biased. (b) the input impedance is high and the output impedance is low. (c) input signal is applied between the base and emitter and the output is obtained between collector and emitter. (d) the input voltage and the output voltage are in phase.

Answer: (c). (a) False: base-emitter junction is forward biased. (b) False: CE input impedance is low and output impedance is high. (c) True: input is between base and emitter, output between collector and emitter. (d) False: output is 180° out of phase with input. So the answer is (c).

When an n-p-n junction transistor is used as an amplifier in common… | MHT CET 2025 (20 Apr, Shift 1)

Q26MHT CET 2025 · 20 APR · SHIFT 1Easy

Junction Transistor

When an n-p-n junction transistor is used as an amplifier in common emitter mode,

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Answer: (c)

(a) False: base-emitter junction is forward biased.
(b) False: CE input impedance is low and output impedance is high.
(c) True: input is between base and emitter, output between collector and emitter.
(d) False: output is $180^\circ$ out of phase with input.
So the answer is (c).

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