Communication Systems
When the length of antenna is a whole wavelength

The radiation at right angles is maximum
The radiation is zero in all directions
The radiation at right angles is zero
The radiation is maximum in all directions

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Communication Systems
DVD uses

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

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Communication Systems
In Pulse Code Modulation system

Quantising noise can be overcome by companding
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

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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 decreases
Amplitude of distant sidebands first increases, then decreases

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