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- I need help with An unknown transistor needs to be identified as a npn or pnp type. A multimeter, with +ve and −ve terminals, is used to measure resistance between different terminals of transistor. If terminal 2 is the base of the transistor t
An unknown transistor needs to be identified as a npn or pnp type. A multimeter, with +ve and −ve terminals, is used to measure resistance between different terminals of transistor. If terminal 2 is the base of the transistor then which of the following is correct for a pnp transistor ?
- Option 1)
+ve terminal 1, −ve terminal 2, resistance high
- Option 2)
+ve terminal 2, −ve terminal 1, resistance high
- Option 3)
+ve terminal 3, −ve terminal 2, resistance high
- Option 4)
+ve terminal 2, −ve terminal 3, resistance low
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
In a transistor, Emitter Base is forward Biased and for amplification purpose resistance should be high.
For pnp; Base should be at negative potential.
Correct option is 1.
Option 1)
+ve terminal 1, −ve terminal 2, resistance high
This is the correct option.
Option 2)
+ve terminal 2, −ve terminal 1, resistance high
This is an incorrect option.
Option 3)
+ve terminal 3, −ve terminal 2, resistance high
This is an incorrect option.
Option 4)
+ve terminal 2, −ve terminal 3, resistance low
This is an incorrect option.
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