For transistor action, which of the following statements is correct? (a) Base, emitter and collector regions should have same size. (b) Both emitter junction as well as the collector junction are forwarded biased. (c) The base region must be very thin and lightly doped. (d) Base, emitter and collector regions should have same doping concentrations.

Answer: (c). (a) and (d) are wrong: the three regions differ in size and doping (emitter heavy, base light, collector moderate and largest). (b) is wrong: for transistor action the emitter junction is forward biased and the collector junction is reverse biased. (c) is right: a thin, lightly doped base lets most carriers reach the collector. So the answer is (c).

For transistor action, which of the following statements is correct? | NEET 2020 (Phase 1)

Q76NEET 2020 · PHASE 1Easy

Junction Transistor

For transistor action, which of the following statements is correct?

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Answer: (c)

(a) and (d) are wrong: the three regions differ in size and doping (emitter heavy, base light, collector moderate and largest).
(b) is wrong: for transistor action the emitter junction is forward biased and the collector junction is reverse biased.
(c) is right: a thin, lightly doped base lets most carriers reach the collector.
So the answer is (c).

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