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?

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 a n-p-n transistor with R as base (B) It is a p-n-p transistor with R as collector (C) It is a p-n-p transistor with R as emitter (D) It is a n-p-n transistor with R as collector

Tardigrade Admin · Accepted Answer

Since no conduction is found when the multimeter is connected across P and Q it means either both P and Q are n-type or p-type. So, it means R is base. When R is connected to the common terminal and conduction is seen when another terminal is connected to P and Q, so it means transistor is in n-p-n configuration with R as the base.