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Question 20233
JEE Physics · Easy

Semiconductors: BJT — Structure MCQ

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BJT — StructureEasyQuestion 20233

Question

A bipolar junction transistor (BJT) consists of:
  1. A
    One p-n junction
  2. B
    Two p-n junctions — either n-p-n or p-n-p
    Correct
  3. C
    One p-n junction and a capacitor
  4. D
    Three n-type regions

Correct answer

Two p-n junctions — either n-p-n or p-n-p

Explanation

BJT: n-p-n (emitter-base-collector) or p-n-p. Three regions: emitter (heavily doped), base (thin, lightly doped), collector (moderately doped). The two junctions are emitter-base and base-collector.

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