Electronics and Communication Engineering - Exam Questions Papers
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21.
A uniform plane magnetic wave incident normally on a plane surface of a dielectric material is reflected and the percentage of reflected power is 75% What is VSWR?
Answer: Option
Explanation:
22.
Silicon is doped with boron to a concentration of 4 x 1017 atoms/cm3. Assuming the intrinsic carrier concentration of silicon to be 1.5 x 1010/cm3 and the value of
to be 25mV at 300K. Compared to undoped silicon, the Fermi level of doped silicon

Answer: Option
Explanation:
Use EF - Ev =
Since it is doped with acceptor impurity, Fermi level will shift down.
23.
The Fourier series of a real periodic function has only
- Cosine terms if it is even
- Sine terms if it is even
- Cosine terms if it is odd
- Sine terms if it is odd
Answer: Option
Explanation:
, then it has 0 and
HZ frequency component.
24.
A communication channel with AWGN operating at a signal to noise ratio SNR >> 1 and bandwidth B has capacity C1. If the SNR is doubled keeping B constant, the resulting capacity C2 is given by
Answer: Option
Explanation:
C = B log2[1 + SNR]
C = B log2[SNR]
C' = B log2[2SNR] = B log2 SNR + B log22
C' = C1 + B.
25.
Power gain of antenna equals directive gain in VHF and UHF range if and only if efficiency of the antenna is __________ .
Answer: Option
Explanation:
Directive gain and power gain are identical except that power gain takes into account the antenna losses. It may be written as
Gp = ηGd η => efficiency
If η = 1 , GP = Gd .
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