‘X’ for an AM is the ratio of change in amplitude of the carrier wave to the amplitude of the original carrier wave. Identify ‘X’.

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1.	‘X’ for an AM is the ratio of change in amplitude of the carrier wave to the amplitude of the original carrier wave. Identify ‘X’.
A.	Automatic gain control
B.	Modulation index
C.	Phase index
D.	Amplitude index
Answer» C. Phase index

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