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A working transitor with its three legs ...

A working transitor with its three legs marked `P, Q and R` is tested using a multimeter No conduction is found between `P, Q `by connecting the common (negative) terminal of the multimeter to `R`and the other (positive) terminal to or `Q` some resistance is seen on the multimeter . Which of the following is true for the transistor ?

A

It is an npn transistor with R as base

B

It is an pnp transistor with R as collector

C

It is an pnp transistor with R as emitter

D

It is an npn transistor with R as collector

Text Solution

Verified by Experts

The correct Answer is:
A
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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Knowledge Check

  • A working transitior with its three legs marked P, Q and R is tested using a multimeter No conduction is found between P, Q by connecting the common (negative) terminal of the multimeter to R and the ofther (positive) terminal to or Q some resistance is seen on the multimeter . Which of the following is true for the transistor ?

    A
    it is an npn transistor with `R` as base
    B
    it is a pop transistor with `R` as collector
    C
    it is a pop transistor with `R` as emitter
    D
    it is an npn transistor with `R` as collector

  • A working transistor with its three legs marked P,Q, and Ris tested using a multimeter to Rand the other (positive) terminal to P or Q . Some resistance is seen on the muiltimeter. Which of the following is true for the transistor ?

    A
    It is pnp transistor with R as emitter
    B
    It is npn transistor with R as collector
    C
    It is npn transistor with R as base
    D
    It is pnp transistor with R as collector

  • If p is true, q is false and r is false, then which of the following is true :

    A
    `(p vv q) implies r`
    B
    `p ^^ ~| (q vv r)`
    C
    `(p vv q) ^^ r`
    D
    `p implies ~| (q implies r)`

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