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Electronics and Communication Engineering - Electromagnetic Field Theory

Exercise : Electromagnetic Field Theory - Section 15
46.

Assertion (A): Intrinsic semiconductor is an insulator at 0 K.

Reason (R): Fermi level in intrinsic semiconductor is in the centre of forbidden energy band.

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.
47.
Typical values of h parameters at about 1 mA collector current for small signal audio amplifier in CE configuration are :
hie = 100 Ω, hre = 10-1, hfe = 50, hoe = 1 m mho
hie = 5 kΩ, hre = 10-4, hfe = 200, hoe = 20 m mho
hie = 5 kΩ, hre = 0, hfe = 50, hoe = 2 m mho
hie = 100 kΩ, hre = 10-2, hfe = 100, hoe = 10 m mho
Answer: Option
Explanation:
No answer description is available. Let's discuss.
48.
A CMOS amplifier when compared to an N-channel. MOSFET, has the advantage of
higher cut off frequency
higher voltage gain
higher current gain
lower current drain from the power supply, there by less dissipation
Answer: Option
Explanation:
No answer description is available. Let's discuss.
49.
Dynamic resistance of diode is
True
False
Answer: Option
Explanation:
No answer description is available. Let's discuss.
50.
The presence of some holes in an intrinsic semiconductor at room temperature is due to
valence electrons
doping
free electrons
thermal energy
Answer: Option
Explanation:
No answer description is available. Let's discuss.
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