The regenerative process where the collector junction temperature increases the collector current and vice versa is called _______.

Question

Question

This question was previously asked in

RRB ALP Mechanic Radio & TV 23 Jan 2019 Official Paper (Shift 3)

Answer 1

The correct option is 4

Concept:

Thermal runaway is a situation in which an increase in temperature changes the conditions in a way that further causes the temperature to increase.
The minority current is a function of the junction temperature of the transistor.
As the junction temperature increases, the minority current also increases.
In BJTs the collector current dissipates a lot of heat, this increase in temperature causes increased flow of minority carriers from collector to base, further increasing the collector current.
This increase in collector current further raises the temperature, thus thermal runaway occurs ending in burnout of BJT.