Question 79Electricity & Electronics - 1st Asst/Chief

The correct answer is B) Install a heat sink. Thermal runaway in a transistor occurs when the increase in temperature causes an increase in the collector current, which in turn causes further heating, leading to a destructive cycle. To prevent this, a heat sink can be installed to dissipate the heat generated by the transistor, thereby maintaining a stable operating temperature and preventing thermal runaway. The other options are incorrect because: A) Increasing the current through the collector-base junction would actually increase the heat generation, exacerbating the thermal runaway issue. C) Increasing the potential difference between the emitter and the base would not directly address the heat dissipation problem. D) Shifting the "Q" point to increase collector current would also increase heat generation, leading to thermal runaway.