A) frequency varies with time
B) amplitude varies with time
C) both frequency and amplitude vary with time
D) both frequency and amplitude are constant
Correct Answer: A
Solution :
In frequency modulation, frequency of earner signal varies in accordance with the modulating signal. The amplitude of the carrier wave is fixed while its frequency is changing. When the instantaneous amplitude of the modulating voltage is large, the instantaneous carrier frequency is higher. It is lower when the modulating voltage is small.
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