Exercise: Communication Systems

Questions for: Communication Systems

In figure the output v(t) is
A:
an amplitude modulated signal
B:
a frequency modulated signal
C:
a phase modulated signal
D:
none of the above
Answer: B
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In phase shift keying the input signal is
A:
st(t) = A cos ω0t and s2(t) = - A cos ω0t
B:
s1(t) = s2(t) = A cos ω0t
C:
s1(t) = A cos ω0t and s2(t) = A cos (ω0t + p/2)
D:
s1(t) = A cos ω0t and s2(t) = - A (cos ω0t + p/2)
Answer: A
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In radar display system PPI stands for
A:
Pulse Position Indicator
B:
Plan Position Indicator
C:
Phase Position Indicator
D:
Point Position Indicator
Answer: B
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Two sine waves of amplitude A1 and A2 are multiplied. The amplitude of the spectral component is
A:
B:
A1A2
C:
D:
(A1A2)1/2
Answer: A
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Zero mean Gaussian noise of variance N is applied to a half wave rectifier. The mean squared value of the rectified output will be
A:
0
B:
N/2
C:
N/2
D:
N
Answer: B
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