Communication Systems
In case of low level amplitude modulation system, the amplifiers following the modulated stage must be

Harmonic devices
Linear devices
Non-linear devices
Class C amplifiers

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Communication Systems
DVD uses

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

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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.

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

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