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Electronics and Communication Engineering - Communication Systems

Exercise : Communication Systems - Section 8
6.
Push pull amplifier is
class B
class A
class C
Class A or Class C
Answer: Option
Explanation:

It is a class B amplifier.

7.
The tape recorders used in homes have
common head and common amplifier system for recording and playback
different heads and amplifiers for recording and playback
same head but different amplifiers for recording and playback
different heads but same amplifier for recording and playback
Answer: Option
Explanation:

Common head and common amplifier is used.

8.
In a communication system, noise is most likely to affect the signal
at the receiver
at the transmitter
at the information source
in the channel
Answer: Option
Explanation:

Noise is mostly generated in channel.

9.
Each frequency in the modulating wave gives rise to four side bands.
True
False
Answer: Option
Explanation:

Each frequency gives two side bands.

10.

Assertion (A): CCIR-B system has 625 scanning lines per frame and 2 : 1 interlace.

Reason (R): The aspect ratio is 4 : 3

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:

.

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