Exercise: Communication Systems

Questions for: Communication Systems

A RADAR can be used to
A:
aim a gun at an aircraft
B:
to direct guided missiles
C:
to search submarines
D:
all of the above
Answer: D

Radar is used for all the three purposes.

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A video monitor is exactly similar to TV receiver.
A:
True
B:
False
C:
D:
Answer: B

Trinitron is a colour picture tube.

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Each kilometer of travel in electromagnetic radiation means a time delay of
A:
330 Ξs
B:
33 Ξs
C:
3.3 Ξs
D:
0.33 Ξs
Answer: C

Since velocity of em waves is 300 m/ms, each kilometer means time delay of 3.3 Ξs.

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In the television system in India, each frame is scanned
A:
100 times
B:
50 times
C:
20 times
D:
10 times
Answer: B

Each frame is divided into odd and even fields. Each field is scanned 25 times so that each frame is scanned 50 times.

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If transmitted power is 75 kW, the field strength at 30 km distance will be about
A:
10 V/m
B:
1 V/m
C:
50 mV/m
D:
2 mV/m
Answer: C

Using the derivation,

.

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