JEE Main 2016 · 9 Apr · Shift 1 · Physics Q30

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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 ?

+ve terminal 1, −ve terminal 2, resistance high

+ve terminal 2, −ve terminal 1, resistance high

+ve terminal 3, −ve terminal 2, resistance high

+ve terminal 2, −ve terminal 3, resistance low

Answer and worked solution

Official answer: B

In a pnp transistor the base (terminal 2) is n-type. With +ve on the base and −ve on an emitter or collector (p-type), the junction is reverse biased and the resistance is high. That is (2).

Topics:Transistors

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JEE Main 2016 · 9 Apr · Shift 1, Physics question 30