What is the modulation index for the FM to behave as a narrowband?

0.25

0.50

0.75

Correct Answer : 0.25

Explanation : When the modulation index is around 0.25 the modulation produces only single pairs of significant sidebands like that of AM. This occupies comparatively less spectrum space.

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Which of the following is true with respect to the bandwidth of a 2kHz audio signal and a 2kHz binary data?

Bandwidth is higher for binary data than audio signals

Bandwidth is higher for audio signals than binary data

Bandwidth remains the same for both

Bandwidth keeps increasing with time for the binary data

Correct Answer : Option (A) : Bandwidth is higher for binary data than audio signals

Explanation : Since binary data is transmitted in square waves or pulses, they are generally made up of numerous fundamental sine waves. This occupies a huge bandwidth as compared to audio signals which are analog in nature and usually comprise of a lesser number of sine waves.