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Electronics and Communication Engineering - Communication Systems

Exercise : Communication Systems - Section 19
11.
On modulating a carrier of frequency fc by an audio signal fs, the following components has resulted:
fc, fc + fs and fc - fs
What is this type of modulation likely to be?
Amplitude modulation (DSB)
Single sideband modulation
Frequency modulation only
Amplitude modulation or frequency modulation
Answer: Option
Explanation:
No answer description is available. Let's discuss.
12.
Strength of space wave is not dependent on distance.
True
False
Answer: Option
Explanation:
No answer description is available. Let's discuss.
13.
Which of the following is not necessarily the advantage of SSB over double sideband, full carrier AM?
The signal is more noise resistant
More channel space is available
Transmitter circuits must be more stable, given better reception
Considerably less power is required for the same signal strength
Answer: Option
Explanation:
No answer description is available. Let's discuss.
14.
A signal m(t) = 5 cos 2p 100 t frequency modulates a carrier. The resulting FM signal is
10 cos {(2p 105 t) + 15 sin (2p 100 t)}
The approximate bandwidth of the FM would be
0.1 kHz
6 kHz
3.2 kHz
100 kHz
Answer: Option
Explanation:
No answer description is available. Let's discuss.
15.
Some possible functions of AGC in a TV receiver are
  1. To increase gain for weak signals
  2. To decrease gain for strong signals
  3. To change the contrast when we switch from one channel to other
  4. To reduce flutter
Which of the above are correct?
1, 2, 3, 4
1, 2, 4
1, 2, 3
2, 3, 4
Answer: Option
Explanation:
No answer description is available. Let's discuss.
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