Exercise: Communication Systems

Questions for: Communication Systems

Assertion (A): A colour TV uses a SAW filter to give stable band pass response and high gain.

Reason (R): Devices using SAW principle are used in many systems.

A:
Both A and R are correct and R is correct explanation of A
B:
Both A and R are correct but R is not correct explanation of A
C:
A is correct but R is wrong
D:
A is wrong but R is correct
Answer: B

SAW means Surface Acoustic Wave. SAW filter is very commonly used in TV sets.

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For attenuation of low frequencies we should use
A:
shunt capacitance
B:
series capacitance
C:
shunt inductance
D:
series inductance
Answer: B

Series capacitance has high reactance for low frequencies.

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The simplest method of suppression of unwanted side band in AM is
A:
filter method
B:
phase shift method
C:
third method
D:
both (a) and (b)
Answer: A

Unwanted frequency is removed by filtering.

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The PSD and the power of a signal g(t) are respectively Sg(ω) and Pg, the PSD and the power of signal a.g(t) are respectively
A:
aS2g (ω) and a2Pg
B:
aSg2 (ω) and aPg
C:
aSg (ω) and a2Pg
D:
aSg (ω) and aPg
Answer: A
No answer description is available. Let's discuss.
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An angle modulated signal is given by s(t) = cos 2p (2 x 106t + 30 sin 150t + 40 cos 150t). The maximum frequency and phase deviations of s(t) are
A:
10.5 kHz, 140p rad
B:
6 kHz and 80p rad
C:
10.5 kHz, 100p rad
D:
7.5 kHz, 100p rad
Answer: D

s(t) = cos 2p(2 x 10+16t + 30 sin 150t + 40 cos 150t)

Phase deviation = 100 p

Frequency deviation = 7.5 kHz.

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