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Electronics and Communication Engineering - Electromagnetic Field Theory

Exercise : Electromagnetic Field Theory - Section 2
21.
The amount of photoelectric emission current depends on the frequency of incident light.
True
False
Answer: Option
Explanation:

It depends on intensity of incident light.

22.
When a p-n junction is forward biased
the width of depletion layer increases
the width of depletion layer decreases
the majority carriers move away from the junction
the current is very small
Answer: Option
Explanation:

Forward voltage decreases the width of depletion layer leading to low resistance.

23.
The carriers of n channel JFET are
free electrons and holes
holes
free electrons or holes
free electrons
Answer: Option
Explanation:

In n type semiconductors carriers are electrons.

24.
The depletion layer around p-n junction in JFET consists of
hole
electron
immobile charges
none of the above
Answer: Option
Explanation:

Depletion layer always has immobile charges.

25.
Junction temperature is always the same as room temperature.
True
False
Answer: Option
Explanation:

When the device is being used, junction temperature is higher than room temperature.

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