Communication Systems
Circular polarization

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

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Communication Systems
DVD uses

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

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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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