Communication Systems
Circular polarization

None of these
Involves critical alignment of transmitting and receiving antenna
Is useful in reducing depolarization effect on received wave
Is useful in discrimination between reception of adjacent beams

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

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