A working transistor with its three legs marked , P Q and R is tested using a multimeter . No conduction is found between P and Q . By connecting the common (negative ) terminal of the multimeter to R and the other (positive) terminal to P or Q. some resistance is seen on the multimeter. Which of the following is true for the transistor ?

Options

A. It is an npn transistor with R as collector .
B. It is an npn transistor with R as base.
C. It is a pnp transistor with R as collector .
D. It is a pnp transistor with R as emitter.

Answer

B

Explanation

Since there no conduction is found between P and so P and Q are either both p - type or both n - type and P and Q are emitter and collector of transistor . When R is connected to the terminal and P or Q to positive terminal of multimeter then emitter base junction will conduct being forward biased or reverse biased.
`:.` It is npn transistor with R as base.