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MHT CET202520 Apr 2025Morning ShiftPhysicsSemiconductorsActual

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

Options

  1. Athe base emitter junction is reverse biased.
  2. Bthe input impedance is high and the output impedance is low.
  3. Cinput signal is applied between the base and emitter and the output is obtained between collector and emitter.
  4. Dthe input voltage and the output voltage are in phase.

Correct answer

C. input signal is applied between the base and emitter and the output is obtained between collector and emitter.

Step-by-step solution

Biasing configuration requires the base-emitter junction to be forward biased and collector-base junction reverse biased for amplification, rendering option A incorrect. Impedance characteristics show moderate input impedance and higher output impedance in common emitter configuration, contradicting option B's claim of high input and low output impedance. Terminal configuration uses the emitter as common to both input and output circuits, with input applied between base and emitter, and output taken between collect

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