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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?

  • Option 1)

    It is an npn transistor with R as collector.

  • Option 2)

    It is an npn transistor with R as base.

  • Option 3)

    It is an pnp transistor with R as collector.

  • Option 4)

    It is an pnp transistor with R as emitter. 

 

Answers (1)

As we have learnt,

 

Transistor -

Three layered semiconducting device .

NPN or PNP

- wherein

1.    Emitter is heavily doped

2.    collector is moderately doped .

3.    Base is lightly doped & very thin

 

 It is an npn tansistor with R as collector.

When multimeter is connected across P and Q there is no counductor. Hence both P & Q are n type of semiconductor. It is therefore clear that R is base. When common end is connected to R and other end is connected to P or Q, conduction is obtained. Hence it is npn with R as base 

 


Option 1)

It is an npn transistor with R as collector.

Option 2)

It is an npn transistor with R as base.

Option 3)

It is an pnp transistor with R as collector.

Option 4)

It is an pnp transistor with R as emitter. 

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Vakul

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