Communication Systems
PAM stands for

Pulse Analogue Modulation
Phase Analogue Modulation
Pulse Amplitude Modulation
Phase Amplitude Modulation

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

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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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