Communication Systems
Leak type bias is used in plate modulated class C amplifier to

Increase the bandwidth
Prevent tuned circuit damping
Prevent excessive grid current
Prevent over modulation

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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.

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

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Communication Systems
In case of frequency modulation, modulating voltage remains constant if the modulating frequency is lowered, then

Amplitude of distant sidebands decreases
Amplitude of distant sidebands remains constant
Amplitude of distant sidebands increases
Amplitude of distant sidebands first increases, then decreases

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