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Question

In the cutoff region the collector-base junction is _____ biased and the base-emitter junction is _____ biased for a transistor.

A
reverse, forward
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B
forward, reverse
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C
reverse, reverse
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D
forward, forward
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Solution

The correct option is C reverse, reverse
Answer: C
In this region both junctions of the transistor are reverse biased. Hence transistor in cut off does not conduct any currents expect for small reverse saturation currents that flow across junctions. In cutoff condition emitter current is zero and the collector current consists of small reverse saturation currents. The transistor when used as switch is operated in cutoff on condition and saturation regions which corresponds to switch off an on condition respectively.

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