Question

Thermal stability can be obtained by_________

(a) shifting operating point

(b) increasing power supply

(c) heat sink

(d) decreasing current at collector

The question was posed to me in class test.

The query is from Thermal Stability in division Transistor Biasing and Thermal Stabilization of Electronic Devices & Circuits

Answer 1

Correct answer is (c) heat sink

Explanation: As power transistors handle large currents, they always heat up during operation. Generally, power transistors are mounted in large metal case to provide a large area from which the heat generated by the device radiates.