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Electronics and Communication Engineering - Electromagnetic Field Theory

Exercise : Electromagnetic Field Theory - Section 12
31.

Assertion (A): In n-p-n transistor conduction is mainly due to electrons.

Reason (R): In n type materials electrons are majority carriers.

Both A and R are true and R is correct explanation of A
Both A and R are true but R is not a correct explanation of A
A is true but R is false
A is false but R is true
Answer: Option
Explanation:
No answer description is available. Let's discuss.
32.
The factor n in the equation for calculating current for a silicon diode is
1
2
2.5
2 for low levels of current and 1 for high levels of current
Answer: Option
Explanation:
No answer description is available. Let's discuss.
33.
An LED is
an ohmic device
a display device
a voltage regulated device
all of the above
Answer: Option
Explanation:
No answer description is available. Let's discuss.
34.
An enhancement mode MOSFET is on when the gate voltage is
zero
positive
high
more threshold value
Answer: Option
Explanation:
No answer description is available. Let's discuss.
35.
For the n-type semiconductor with n = NP and P = , the hole concentration will fall below the intrinsic value because some of the holes
drop back to acceptor impurity states.
drop to donor impurity states
virtually leave the crystal
recombine with the electrons.
Answer: Option
Explanation:
No answer description is available. Let's discuss.
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