Exercise: Communication Systems

Questions for: Communication Systems

Assertion (A): In SSB, carrier is suppressed by about 45 dB

Reason (R): SSB is standard form for radio communication

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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SSB stands for
A:
Single Side Band
B:
Suppressed Side Band
C:
Single Sound Band
D:
Single Sky Band
Answer: A
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TV receivers use flyback switched mode power supply because
A:
it can supply many voltage outputs
B:
it does not require a filter choke and is cheap
C:
it has very good regulation at all loads
D:
both (a) and (c)
Answer: B
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Modulation index of a AM wave is measured using oscilloscope. The display on the CRO is as shown in figure it can be concluded that
A:
the output wave is distorted
B:
the output wave is under modulated
C:
the modulation index is 100%
D:
the modulation index is 50%
Answer: A
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What is typical bandwidths of a 2-wire telephone line?
A:
300 Hz to 3.4 kHz
B:
20 Hz to 4 kHz
C:
dc to 4 kHz
D:
20 Hz to 20 kHz
Answer: A
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