An unknown transistor needs to be identified as a npn or pnp type. A… | JEE Main 2016 (9 Apr, Shift 1)

Q100JEE Main 2016 · 9 APR · SHIFT 1Difficult

Junction Transistor

An unknown transistor needs to be identified as a npn or pnp type. A multimeter, with + ve and − ve terminals, is used to measure resistance between different terminals of transistor. If terminal 2 is the base of the transistor then which of the following is correct for a pnp transistor?

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Answer: (a)

In a pnp transistor the base (terminal 2) is n-type; emitter and collector are p-type.
In an analog multimeter (resistance mode) the +ve terminal is connected to the negative of the internal cell, so it is at the lower potential.
+ve on 1, −ve on 2 puts the p-side (1) at lower potential than the n-base: the junction is reverse biased, so resistance is high.
So the answer is (a).

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Junction Transistor question from JEE Main 2016 (9 Apr, Shift 1)

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