1.

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 to P and Q, some resistance is seen on the multimeter. Which of the following is true for the transistor?

Answer»

<P> 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
It is an npn transistor with R as collector

Solution :When a multimeter is connected between `P` and `Q` and there is no CONDUCTION between `P` and `Q`, then `P` and `Q` are of same type of semiconductors, i.e. either both are of n-type or p-type. It means that emitter and collector of a transistor are `P` and `Q`. When R is connected to negative terminal of multimeter and positive terminal to `P` and `Q`, then emitter-base junction will conduct to some EXTENT due to reverse BIASING. The similar is the case of collector-base junction. Thus, the transistor is npn transistor with `R` as base.


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