Communication Systems
A cordless telephone using separate frequencies for transmission in base and portable units is known as

Neither A nor B
Either A or B
Half duplex arrangement
Duplex arrangement

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

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