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Electronics and Communication Engineering - Communication Systems

Exercise : Communication Systems - Section 23
1.
If the target cross-section is changing, the best scanning system for accurate tracking is
lobe switching
monopulse
sequential lobing
conical scanning
Answer: Option
Explanation:
No answer description is available. Let's discuss.
2.
If e = 10 sin(108 t + 3 sin 104 t) then the modulation index is
1
2
3
4
Answer: Option
Explanation:
No answer description is available. Let's discuss.
3.
Frequency modulation consists in
varying the frequency and amplitude of the carrier in accordance with the instantaneous value of modulating signal
varying the amplitude of the carrier in accordance with the instantaneous value of the modulating voltage
varying the frequency of the carrier voltage in accordance with the instantaneous value of the modulating voltage
vary the frequency of the carrier voltage
Answer: Option
Explanation:
No answer description is available. Let's discuss.
4.
Pulse modulation is often used in
microwave band
FL band
telegraphy
telephony
Answer: Option
Explanation:
No answer description is available. Let's discuss.
5.
Thermal noise has a power spectral density which is quite uniform upto frequencies in the order of
100 Hz
106 Hz
109 Hz
1013 Hz
Answer: Option
Explanation:
No answer description is available. Let's discuss.
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