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Electronics and Communication Engineering - Communication Systems

Exercise : Communication Systems - Section 11
46.
The smallest change in sound intensity that can be detected by human ear is __________ dB.
1
3
10
20
Answer: Option
Explanation:
No answer description is available. Let's discuss.
47.
Low frequency boost can be easily compensated by
attenuating the frequencies from 0 to 1.25 MHz
using an appropriate de-emphasis circuit in the receiver
using an appropriate pre-emphasis circuit in the transmitter
none
Answer: Option
Explanation:
No answer description is available. Let's discuss.
48.
An MTI compares a set of received echos with those received during the previous sweep.
True
False
Answer: Option
Explanation:
No answer description is available. Let's discuss.
49.
If e = 10 sin(108 t + 3 sin 104 t) then the deviation is
4.77 kHz
47.7 kHz
477 kHz
4770 kHz
Answer: Option
Explanation:
No answer description is available. Let's discuss.
50.
When a complex signals is used to frequency modulate a carrier, the resulting sideband distribution is
symmetrical about the carrier
not necessarily symmetrical about the carrier
decided by the predominant sidebands
none of the above
Answer: Option
Explanation:
No answer description is available. Let's discuss.
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