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In cut off mode

(a) The base-emitter junction is forward biased and emitter-collector junction is reversed biased

(b) The base-emitter junction is forward biased and emitter-collector junction is forward biased

(c) The base-emitter junction is reversed biased and emitter-collector junction is reversed biased

(d) The base-emitter junction is reversed biased and emitter-collector junction is forward biased

The question was posed to me during an interview for a job.

I need to ask this question from BJTs Device Strucutres and Physical Operations topic in section Bipolar Junction Triodes (BJTs) of Electronic Devices & Circuits

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The correct choice is (c) The base-emitter junction is reversed biased and emitter-collector junction is reversed biased

Explanation: In cut-off mode there is no current flowing through the BJT hence both junctions must be reversed biased else if either of them is forward biased then the current will flow.

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