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Electronics and Communication Engineering - Communication Systems

Exercise : Communication Systems - Section 18
16.
Which of the following statement is correct?
Pre-emphasis circuits are used in AM transmitters
FM reception is noise free as compared to AM
A limiter state is also used in AM receivers
Discriminator is used for the detection of AM signals
Answer: Option
Explanation:
No answer description is available. Let's discuss.
17.
Which of the following is true as regards telephone systems?
A larger facility carrying a larger load operates less efficiently than a smaller capacity
A larger facility carrying a lesser load operates more efficiently than a smaller capacity
A larger facility carrying a larger load operates more efficiently than a smaller capacity
A smaller capacity carrying a larger load operates more efficiently than a larger capacity
Answer: Option
Explanation:
No answer description is available. Let's discuss.
18.
SSB can be generated by
filter method
phase shift method
weaver's method
none of the above
Answer: Option
Explanation:
No answer description is available. Let's discuss.
19.
Which one of the following cannot be used to remove the unwanted sideband in SSB?
Balanced modulator
Phase shift method
Filter system
Third method
Answer: Option
Explanation:
No answer description is available. Let's discuss.
20.
For FM, which of the following statement is not true?
The bandwidth increases as modulation index is increased
The total power remains constant with respect to modulation index
The carrier never becomes zero
All of the above
Answer: Option
Explanation:
No answer description is available. Let's discuss.
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