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Electronics and Communication Engineering - Communication Systems

Exercise : Communication Systems - Section 12
31.
Which of the following terms is not applicable to Yagi-Uda array?
High gain
Folded dipole
Parasitic elements
Good bandwidth
Answer: Option
Explanation:
No answer description is available. Let's discuss.
32.
If transmission path, in PCM, is very long then
repeater stations are used
pulse width may be increased
pulse amplitude is increased
pulse spacing is reduced
Answer: Option
Explanation:
No answer description is available. Let's discuss.
33.
In a single tone AM the power of carrier is P and modulation index is m. The powers of each of the two side bands are
Answer: Option
Explanation:
No answer description is available. Let's discuss.
34.
If F(ω) is Fourier transform of f(t), then the Fourier transform of f(t) cos ωct is
F(ω + ωc) + F(ω - ωc)
[F(ω + ωc) + F(ω - ωc)]
F(ω + ωc) - F(ω - ωc)
[F(ω + ωc) - F(ω - ωc)]
Answer: Option
Explanation:
No answer description is available. Let's discuss.
35.
In a TV receiver the raster is normal but there is no sound and quality of picture is poor. The defective part is
power supply
loudspeaker
AGC, video IF amplifier, RF amplifier
horizontal oscillator
Answer: Option
Explanation:
No answer description is available. Let's discuss.
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