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Electronics and Communication Engineering - Communication Systems

Exercise : Communication Systems - Section 4
6.

Assertion (A): In India we use CCIR-B standard

Reason (R): Video signals are frequency modulated.

Both A and R are correct and R is correct explanation of A
Both A and R are correct but R is not correct explanation of A
A is correct but R is wrong
A is wrong but R is correct
Answer: Option
Explanation:

Video signals are amplitude modulated.

7.
CATV stands for
Common Antenna Television
Community Antenna Television
Cable Antenna Television
Channel Antenna Television
Answer: Option
Explanation:

In USA the first cable service was called community antenna television.

8.
Household tape recorders use
separate motor for each operation
only one motor for all operations
one motor for capstan and another for take up reel
a total of 3 motors
Answer: Option
Explanation:

For reasons of economy only one motor is used.

9.
A 400 W carrier is modulated to a depth of 75 percent. The total power in modulated wave will be
38.5 W
400 W
512.5 W
615.5 W
Answer: Option
Explanation:

Sideband frequencies will be fc ± fm.

10.
A geostationary satellite
is located at a height of 358, 00 km
appears stationary over earth's magnetic pole
is motionless in space but keeps spinning
orbits the earth within a 24 hour period
Answer: Option
Explanation:

It orbits the earth in a 24 hour period. Thus it appears to be stationed over one spot of the globe.

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