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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

  1. AIt is an n-p-n transistor with R as base
  2. BIt is an p-n-p transistor with R as collector
  3. CIt is an p-n-p transistor with R as emitter
  4. DIt is an n-p-n transistor with R as collector

Correct answer

A. It is an n-p-n transistor with R as base

Step-by-step solution

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

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