Question

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 predicted

I got this question in unit test.

This question is from Transistor as a Switch in chapter Transistor Characteristics of Electronic Devices & Circuits

Answer 1

Right answer is (c) less than 0.7V

For 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.