Question

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?

(a) It is an n-p-n transistor with R as collector.

(b) It is an n-p-n transistor with R as base.

(c) It is a p-n-p transistor with R as collector.

(d) It is a p-n-p transistor with R as emitter.

Answer 1

Correct Option (a) It is an n-p-n transistor with R as collector.

Explanation:

Since, no conduction is found when multimeter is connected across P and Q, it means either both P and Q are n-type or p-type.

So, it means B is base. When B is connected to common terminal and conduction is seen when other terminal is connected to P or Q, so it means transistor is n-p-n with R as base.