Communication Systems
To eliminate ghosts in the picture

Twist the transmission line
Use a longer transmission line
Connect a booster
Change the antenna orientation of location

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Communication Systems
DVD uses

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

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Communication Systems
Circular polarization

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

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