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- Need explanation for: 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) termi
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 learnt in
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
Since by connecting R to negative terminal and P or Q to positive terminal, there is some resistance and hence it is in forward biased mode.
Hence, R has to be -n type.
R is collector and the transistor is npn.
Correct option is 1.
Option 1)
It is an npn transistor with R as collector.
This is the correct option.
Option 2)
It is an npn transistor with R as base.
This is an incorrect option.
Option 3)
It is an pnp transistor with R as collector.
This is an incorrect option.
Option 4)
It is an pnp transistor with R as emitter.
This is an incorrect option.
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