Exercise: Communication Systems

Questions for: Communication Systems

Assertion (A): Bandwidth of a TV signal is 5 MHz.

Reason (R): TV systems use vestigial side band transmission.

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
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A device with input x(t) and y(t) is characterized by y(t) = x2(t). An FM signal with frequency deviation of 90 kHz and modulating signal bandwidth of 5 kHz is applied to this device. The bandwidth of the output signal is
A:
370 kHz
B:
190 kHz
C:
380 kHz
D:
95 kHz
Answer: C

If we square the signal, bandwidth will becomes double.

B.W. for x(t) = 2(90 + 5) = 190 kHz

for x2(t) = 2 x 190 380 kHz.

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To separate channels in FDM receiver we have to use
A:
integration
B:
AND gate
C:
band pass filter
D:
differentiation
Answer: C

Band pass filter allows a band of frequencies to pass through and attenuates other frequencies.

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Assertion (A): The colour signal consists of only luminance signal

Reason (R): In India PAL colour signal system is used.

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: D

Colour signal consists of luminance and chrominance.

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Microwave link repeaters are typically 50 km apart in TV transmission due to
A:
atmosphere attenuation
B:
output power tube limitations
C:
attenuation of surface wave
D:
earth's curvature
Answer: D

Earth's curvature limits line of sight distance. Therefore, repeaters are needed.

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