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The base emitter voltage in a cut off region is _________(a) greater than 0.7V(b) equal to 0.7V(c) less than 0.7V(d) cannot be predictedI got this question in an interview for job.I need to ask this question from Transistor Switching Times in chapter Transistor Characteristics of Electronic Devices & Circuits

Answer»

Correct choice is (C) LESS than 0.7V

Easiest explanation: From the cut off characteristics, the base EMITTER voltage (VBE) in a cut off region is less than 0.7V. The cut off region can be considered as ‘off MODE’. Here, VBE < 0.7 and IC=0. For a PNP transistor, the emitter potential MUST be negative with respect to the base.



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