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Engineering Exams RRB-JE CMA (Chemical and Metallurgical Assistant) Technical Abilities 2025 22.04.25 Paper-2 Shift-1 Medium +1 -0.33
What does BJT stand for?
Correct Answer: C. Bipolar Junction Transistor
Explanation: BJT stands for Bipolar Junction Transistor. It is a three-terminal semiconductor device—comprising the emitter, base, and collector—that utilizes both electrons and electron holes as charge carriers. This dual-carrier nature is why it is termed "bipolar." Structurally, it consists of two p-n junctions formed by layering p-type and n-type materials in either NPN or PNP configurations. Functionally, a BJT acts as a current-controlled device where a small current at the base terminal regulates a significantly larger current between the collector and emitter, allowing it to serve as an effective amplifier or an electronic switch.
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