Communication Systems
Assertion (A): In FM the frequency of the carrier is varied by the modulating voltageReason (R): FM and PM are two forms of angle modulation.

A is wrong but R is correct
Both A and R are correct but R is not correct explanation of A
A is correct but R is wrong
Both A and R are correct and R is correct explanation of A

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Communication Systems
DVD uses

Video head for recording and laser beam for playback
Laser beam for recording and video head for playback
Laser beam for both recording and playback
None of these

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Communication Systems
In Pulse Code Modulation system

Quantising noise can be overcome by companding
Large bandwidth is required
Quantising noise can be reduced by decreasing the number of standard levels
Suffers from the disadvantage of its incompatibly with TDM

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