question_answer

An unknown transistor needs to be identified as npn or pnp type. A multi meter, with +ve and -ve terminals, is used to measure resistance between different terminals transistor. If terminal 2 is the base of the transistor then which of the following is correct for a pnp transistor? [JEE ONLINE 09-04-2016]

A) +ve terminal 3, -ve terminal 2, resistance high

B) +ve terminal 2, -ve terminal 3, resistance low

C) +ve terminal 1, -ve terminal 2, resistance high

D) +ve terminal 2, -ve terminal 1, resistance high

Correct Answer: D

Solution :

[d]

when pn junction is forward biased resistance is law. When pn junction reverse biased resistance is high