IndiaBIX

Electronics and Communication Engineering - Communication Systems

Exercise : Communication Systems - Section 12
21.
In a system using QASK and 4 bits to form a symbol, the required bandwidth is
same as BPSK
half of that in BPSK
one-fourth of that in BPSK
none of the above
Answer: Option
Explanation:
No answer description is available. Let's discuss.
22.
Each of the following statements regarding frequency modulation is true except
amplitude of the modulated wave remains the same as that of carrier wave
the amount of variation of deviation from the original carrier frequency is determined by the frequency of the modulating signal
the rate at which the frequency of modulated wave varies is determined by the frequency of the modulating signal
frequency of modulated wave increases as the signal voltage increases and vice-versa
Answer: Option
Explanation:
No answer description is available. Let's discuss.
23.

Assertion (A): Radio transmission is by sky waves

Reason (R): Waves having frequencies higher than 30 MHz penetrate the atmosphere and do not return to earth.

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.
24.
During playback the take up reel is
in clockwise motion
in anticlockwise motion
either clockwise or anticlockwise motion
none of the above
Answer: Option
Explanation:
No answer description is available. Let's discuss.
25.
To avoid objectionable noise in a microwave TV link, the SNR should be about
50 or more
10 or more
25 or more
200 or more
Answer: Option
Explanation:
No answer description is available. Let's discuss.
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