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Electronics and Communication Engineering - Communication Systems

Exercise : Communication Systems - Section 17
21.
In push button type telephone set, pressing a button generates
one frequency
two high frequencies
two low frequencies
one low frequency and one high frequency
Answer: Option
Explanation:
No answer description is available. Let's discuss.
22.
If sound wave has an intensity of 10 Pa. The dB level is about
1.139 dB
11.39 dB
113.9 dB
1139 dB
Answer: Option
Explanation:
No answer description is available. Let's discuss.
23.
The intermediate frequencies in VCR are
video 38.9 MHz and audio 33.4 MHz
38.9 MHz for both video and audio
33.4 MHz for both video and audio
33.4 MHz for video and 38.9 MHz for audio
Answer: Option
Explanation:
No answer description is available. Let's discuss.
24.

Assertion (A): In TV scanning is done from left to right and top to bottom.

Reason (R): Interlaced scanning is useful in eliminating flicker

Both A and R are correct and R is correct explanation of A
Both A and R are correct but R is not correct explanation of A
A is correct but R is wrong
A is wrong but R is correct
Answer: Option
Explanation:
No answer description is available. Let's discuss.
25.
The unit of loudness is
phon
sone
decibel
mel
Answer: Option
Explanation:
No answer description is available. Let's discuss.
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