Exercise: Communication Systems

Questions for: Communication Systems

If F(ω) is Fourier transform of f(t), then Fourier transform of f(t) cos2 ωct is
A:
F(ω) + [F(ω + 2ωc) + F(ω - 2ωc)]
B:
F(ω) + [F(ω + 2ωc) + F(ω - 2ωc)]
C:
F(ω) - [F(ω + 2ωc) + F(ω - 2ωc)]
D:
F(ω) - [F(ω + 2ωc) + F(ω - 2ωc)]
Answer: A
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In radio receivers, the value of IF is
A:
100 kHz
B:
225 kHz
C:
455 kHz
D:
850 kHz
Answer: C
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Which statement is incorrect for the signal x(t) = 5 sin (2p x 103t) sin (2p x 106t)?
A:
Upper side band frequency is 1001000
B:
Carrier amplitude is 5
C:
Lower sideband frequency is 990000
D:
x(t) is DSB-SC
Answer: C
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FM is named so because
A:
it restrains the frequency excursions of FM
B:
it increases the frequency excursions of FM
C:
it decreases the amplitude of FM signal
D:
it increases the amplitude of FM signal
Answer: A
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The PAM Signal can be detected by
A:
Band pass filter
B:
Band stop filter
C:
High pass filter
D:
Low pass filter
Answer: D
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