Question

Diode acts as a short circuit when switched from forward to reverse bias for some time due to______

(a) Accumulation of minority charge carriers when it’s in forward bias

(b) Accumulation of majority charge carriers   when it’s in forward bias

(c) Accumulation of minority charge carriers when it’s in reverse bias

(d) Accumulation of majority charge carrier when it’s in reverse bias

This question was addressed to me during an online exam.

The origin of the question is PN Diode Switching Times in division Semiconductor-Diode Characteristics of Electronic Devices & Circuits

Answer 1

The correct answer is (a) Accumulation of minority charge carriers when it’s in forward bias

Best explanation: When a diode is switched suddenly, it persists the conducting property for a short time in its reverse bias also. This leads to excess minority charge carrier settlement at potential barrier. Hence acts as a short circuit.