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?
It is an npn transistor with R as collector.
It is an npn transistor with R as base.
It is an pnp transistor with R as collector.
It is an pnp transistor with R as emitter.
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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