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Electronics and Communication Engineering - Communication Systems

Exercise : Communication Systems - Section 11
11.
In the spectrum of an FM wave
When modulation index is large, carrier frequency disappears
carrier frequency cannot disappear
amplitude of any side band depends on modulation index
the total number of side bands depend on modulation index
Answer: Option
Explanation:
No answer description is available. Let's discuss.
12.
The reactance of bypass capacitor in a CE amplifier circuit should be
equal to the resistance in parallel with it
equal to 10% or less of the resistance in parallel with it
equal to 50% of the resistance in parallel with it
independent of the resistance in parallel with it
Answer: Option
Explanation:
No answer description is available. Let's discuss.
13.
In a radar system the solution to blind speed problem is to
use MTI
use monopoles
vary PRF
change Doppler frequency
Answer: Option
Explanation:
No answer description is available. Let's discuss.
14.
For a FM wave carrier modulating frequency is 10 kHz and bandwidth is 2 MHz. If the modulating signal amplitude is doubled, the bandwidth will be
0.5 MHz
1 MHz
2 MHz
4 MHz
Answer: Option
Explanation:
No answer description is available. Let's discuss.
15.
In band III of TV, distant reception (beyond line of sight range) is possible due to
tropospheric bending by refraction
reflection of waves
ionospheric scattering
none of the above
Answer: Option
Explanation:
No answer description is available. Let's discuss.
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