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If a BJT is to be used as an amplifier, then it must operate in___________

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If a BJT is to be used as an amplifier, then it must operate in___________

(a) Cut-off mode

(b) Active mode

(c) Saturation mode

(d) All of the mentioned

The question was asked in an online interview.

I'm obligated to ask this question of BJTs Device Strucutres and Physical Operations in portion Bipolar Junction Triodes (BJTs) of Electronic Devices & Circuits

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Right choice is (b) Active mode

Explanation: A BJT operates as an amplifiers in active mode and as a switch in cut-off or saturation mode.

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