Exercise: Communication Systems

Questions for: Communication Systems

If each short element of signal occupies 20 ms, the speed is
A:
20 bauds
B:
50 bauds
C:
bauds
D:
0.05 bauds
Answer: B

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To relay outdoor remotely located live programs, TV transmitter use
A:
microwave links
B:
coaxial cable link
C:
open wire link
D:
either (b) or (c)
Answer: A

Microwave links are used.

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In transistor radio receivers the number of IF amplifier stages are
A:
1
B:
2
C:
4
D:
6
Answer: B

Two IF amplifier stages are very commonly used.

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Which of the following types of noise assumes greater importance at high frequencies?
A:
Transit time noise
B:
Shot noise
C:
Impulse noise
D:
Random noise
Answer: A

At high frequencies time period of wave and transit time become comparable.

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For an ideal 3000 Hz channel, S/N ratio is
A:
3
B:
1.5
C:
4
D:
2
Answer: A

= 26000/3000 - 1 = 3.

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