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Electronics and Communication Engineering - Communication Systems

Exercise : Communication Systems - Section 1
31.
In standing wave pattern on a transmission line
voltage and current nodes coincide
voltage and current antinodes coincide
voltage nodes and current antinodes as well as current nodes and voltage antinodes coincide
both (a) and (b)
Answer: Option
Explanation:

When standing wave is set up voltage maxima and current minima and voltage minima and current maxima coincide.

32.
If the bandwidth is increased by 2, the γFM γAM (where γ is the ratio of SNR of output to SNR at input, FM is frequency modulation and AM is amplitude modulation) is increased by a factor of
2
3
4
6
Answer: Option
Explanation:

Doubling of frequency increase SNR in frequency modulation by 4. It has no effect in AM.

33.
In the figure , the output y(t) will be
Answer: Option
Explanation:

34.
A carrier wave carries information.
True
False
Answer: Option
Explanation:

Carrier does not have any information.

35.
Frequency shift keying is used mostly in
telegraphy
telephony
satellite communication
radio transmission
Answer: Option
Explanation:

Frequency shift keying (FSK) is a system of frequency modulation used in telegraphy.

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