Communication Systems
Which of the following is an indirect way of generating FM?

Reactance bipolar transistor
Armstrong modulator
Reactance FET modulator
Varactor diode modulator

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Communication Systems
In Pulse Code Modulation system

Quantising noise can be reduced by decreasing the number of standard levels
Large bandwidth is required
Suffers from the disadvantage of its incompatibly with TDM
Quantising noise can be overcome by companding

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Communication Systems
Circular polarization

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

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