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Electronics and Communication Engineering - Communication Systems

Exercise : Communication Systems - Section 21
46.
Which SNR denotes excellent picture quality in TV?
50 dB
30 dB
15 dB
5 dB
Answer: Option
Explanation:
No answer description is available. Let's discuss.
47.
In amplitude modulation
the amplitude of carrier varies in accordance with the amplitude of the modulating signal.
the modulating frequency lies in the audio range
the amplitude of the carrier remains constant
the amplitude of the carrier varies in accordance with the frequency of the modulating signal.
Answer: Option
Explanation:
No answer description is available. Let's discuss.
48.
At f = 7 GHz, a 120 cm dish antenna gives a gain of about
50
500
5000
50000
Answer: Option
Explanation:
No answer description is available. Let's discuss.
49.
PIL colour picture tube has the main advantage that
it is cheap
it ensures purity in colour
it is self convergent
both (a) and (b)
Answer: Option
Explanation:
No answer description is available. Let's discuss.
50.
What is the frequency of the modulated carrier wave?
1000 Hz
2000 Hz
1000 kHz
2000 kHz
Answer: Option
Explanation:
No answer description is available. Let's discuss.
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