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Electronics and Communication Engineering - Communication Systems

Exercise : Communication Systems - Section 24
16.
In case of low level amplitude modulation system, the amplifiers following the modulated stage must be
class C amplifiers
linear devices
non-linear devices
harmonic devices
Answer: Option
Explanation:
No answer description is available. Let's discuss.
17.
Under ordinary circumstances, impulse noise can be reduced in
FM only
AM only
both AM and FM
none of the above
Answer: Option
Explanation:
No answer description is available. Let's discuss.
18.
In case of frequency modulation, modulating voltage remains constant if the modulating frequency is lowered, then
amplitude of distant sidebands decreases
amplitude of distant sidebands increases
amplitude of distant sidebands remains constant
amplitude of distant sidebands first increases, then decreases
Answer: Option
Explanation:
No answer description is available. Let's discuss.
19.
If sampling is done at the rate of 10 kHz. The bandwidth required is
35 kHz
70 kHz
10 kHz
1280 kHz
Answer: Option
Explanation:
No answer description is available. Let's discuss.
20.
It is found that a ship to ship communication suffers from fading. This can be avoided by using
space diversity
frequency diversity
broad band antenna
directional antenna
Answer: Option
Explanation:
No answer description is available. Let's discuss.
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