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

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

When n-p-n junction transistor is used as an amplifier in common… | MHT CET 2024 (11 May, Shift 2)

Q36MHT CET 2024 · 11 MAY · SHIFT 2Easy

Junction Transistor

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

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Answer: (c)

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

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