MCQ Practice Question

Electronic Devices & Circuits BJT Biasing

Thermal runaway in a BJT refers to a potentially destructive process in which?

AIncreasing temperature can increase collector current and power dissipation, causing further heating
BThe transistor temperature always falls as current rises
CBase current becomes exactly zero at all temperatures
DThe collector-emitter voltage becomes an AC waveform only

Correct Answer: A. Increasing temperature can increase collector current and power dissipation, causing further heating

Explanation: Temperature-dependent increases in leakage/current can raise power dissipation, causing additional heating and potentially a regenerative failure process if bias is not stabilized.

Reference: Standard transistor electronics: thermal stability