Question

The base-emitter voltage of a BJT…………with temperature.
(A) increases
(B) decreases
(C) remains constant
(D) is indeterminate

Answer 1

Hint: The parameters of the transistor get affected by the temperature change. So using the information that the temperature can produce variation in the base-emitter voltage and temperature relates directly with the transistor's flowing current, so with the help of this important information, the determination of the correct answer becomes easy.


Complete step by step answer
The BJT is known as bipolar junction transistor; it is the three-layer semiconductor device consisting of either two n and one p-type layer of material or two p and one n-type layers of material. Based on these arrangements, the bipolar junction transistor is divided into types; one is NPN, and the other is PNP. These are the most common transistors used in the linear amplifier circuits (Here linear means the output is proportional to input), and as a switch, these can also be used.

The base-emitter voltage of the bipolar junction transistor varies when the change in temperature occurs. The temperature variation is related directly to the current. If the transistor temperature rises, it will raise the collector current because the amount of current flowing in the intrinsic semiconductor rises due to increase in temperature, and the base-emitter voltage decreases.

Therefore, the base-emitter voltage of a BJT decreases with temperature, and option (B) is correct.


Note: The bipolar junction transistor is the special type of electronic device used for special purposes. So, remember the various parameters and characteristics of the bipolar junction transistor to relate them with the temperature variation and obtain the correct answer.