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Electronics and Communication Engineering - Communication Systems

Exercise : Communication Systems - Section 8
31.
In an FM signal, the modulating frequency is 2 kHz and maximum deviation is 10 kHz. The bandwidth requirement is
2 kHz
10 kHz
5 kHz
32 kHz
Answer: Option
Explanation:

Bandwidth = 2(10 + 5) j 30 kHz. This is an approximate value.

Exact value is 32 kHz.

32.
The effective length of antenna is different from actual length due to
top loading
end effects
both (a) and (b)
none of the above
Answer: Option
Explanation:

The effective length is more than actual length due to the effect of top loading and end effects.

33.
In a TV receiver there is no raster, no picture and no sound. The most likely defective stage is
power supply unit
video output circuit
horizontal oscillator
balun
Answer: Option
Explanation:

If power supply is working, raster will exist.

34.
Noise can be measured by
D.C. voltmeter
A.C. voltmeter
either of the above
none of the above
Answer: Option
Explanation:
No answer description is available. Let's discuss.
35.
A 100 + j 100 Ω load is to be matched to a line with Z0 = 300 Ω to give SWR = 1. The reactance of stub is
j 200 Ω
-j 200 Ω
j 100 Ω
-j 100 Ω
Answer: Option
Explanation:

ZL = 100 + j 100

Susceptance of stub = j 0.005 mho.

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