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Electronics and Communication Engineering - Communication Systems

Exercise : Communication Systems - Section 21
11.
In a modulator it is found that the amplitude spectrum consists a component at fc, the carrier frequency and one component each at fc - fs and fc + fs where fs is the modulating signal frequency. Then the modulator used is
AM
AM or MBFM with modulation index 0.5
FM
PAM
Answer: Option
Explanation:
No answer description is available. Let's discuss.
12.
Frequency shift keying is used mostly in
telephony
telegraphy
radio transmission
none of the above
Answer: Option
Explanation:
No answer description is available. Let's discuss.
13.
Troposphere is the portion of atmosphere
nearest to ground
between 50 to 90 km above ground
between 110 to 220 km above ground
between 250 to 350 km above ground
Answer: Option
Explanation:
No answer description is available. Let's discuss.
14.
Earth's curvature affects the effective height of antenna.
True
False
Answer: Option
Explanation:
No answer description is available. Let's discuss.
15.
In PCM, the quantization noise depends on
sampling rate
signal power
number of quantization level
signal energy
Answer: Option
Explanation:
No answer description is available. Let's discuss.
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