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What is it called when an FM signal occupies no more spectrum space than AM signal?

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What is it called when an FM signal occupies no more spectrum space than AM signal?

(a) Amplitude modulated frequency wave

(b) Narrowband FM

(c) Shortband FM

(d) Equalband FM
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Correct option is (b) Narrowband FM

The explanation: A narrowband FM is in which the FM signal occupies the same spectrum space as of its equivalent AM signal. Common FM radios use the narrowband transmission to reduce spectrum space.
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