Communication Systems
Fourier analysis indicate that a square wave can be represented as

A fundamental sine wave and even harmonics
Fundamental and subharmonic sine waves
A fundamental sine wave and harmonics
A fundamental sine wave and odd harmonics

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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 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

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

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Communication Systems
In Pulse Code Modulation system

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

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