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Electronics and Communication Engineering - Communication Systems

Exercise : Communication Systems - Section 2
6.
It is found that in a telephone system 60 subscribers initiate calls during a 30 minute interval and the total duration of all the calls is 100 minutes. The load is
2
3 erlang
3.333 erlang
0.333 erlang
Answer: Option
Explanation:

.

7.
E and H fields are perpendicular to each other.
True
False
Answer: Option
Explanation:

Radio waves have very high speed equal to that of light but speed of sound waves is very low.

8.
Consider the following:
  1. A TV receiver antenna should pick up the TV signal and develop maximum voltage from the available strength of signal
  2. It should reject unwanted signals
  3. It should not suffer from co-channel interference
  4. It should have a very narrowband
The correct statements are
1 and 2 only
1, 2 and 3 only
1, 2, 3, 4
2, 3 only
Answer: Option
Explanation:

The band should not be narrow.

9.
If transmission bandwidth is doubled in FM, SNR is
doubled
raised four times
decreased four times
halved
Answer: Option
Explanation:

SNR changes in the ratio of square of change in bandwidth.

10.
Directivity means
maximum directive gain
zero directive gain
minimum directive gain
none of the above
Answer: Option
Explanation:

Directivity means maximum directive gain.

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