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Question

When both the amplitude and the frequency of a sinusoidal message signal are doubled,the modulation index will be doubled in1. Amplitude modulation2. Frequency modulation3. Phase ModulationSelect the correct answer using the codes given below:

A
1,2 and 3
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B
2 and 3 only
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C
1 and 3 only
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D
2 only
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Solution

The correct option is C 1 and 3 only
Let,m(t)=Amcos(2πfmt)For AM,μAM=kaAmFor FM,βFM=kfAmfmFor FM,βPM=kpAmSo, when both Am and fm are doubled, μAM and βPM wil be doubled and βPM will remain be unchanged

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