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The amount of frequency deviation in FM signal depends on ________

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The amount of frequency deviation in FM signal depends on ________

(a) Modulating frequency

(b) Modulation Index

(c) Amplitude of the modulating signal

(d) Carrier frequency

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Right answer is (c) Amplitude of the modulating signal

Easy explanation: The amount of frequency deviation in the FM signal depends on amplitude of the modulating signal. So for any audio signal, as the loudness increases frequency deviation in carrier signal also increases. Frequency deviation helps in determining the bandwidth of FM signal.

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