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Question:

A 100V carrier wave is made to vary between 160V and 40V by a modulating signal. What is the modulation index?

0.6

0.5

0.3

0.4

Solution:

The correct option is A 0.6
Given:
Modulated voltage Ac = 100
Range of modulated voltage
Ac + Am = 160
Ac - Am = 40
Ac = 100 and Am = 40
Hence, modulation index μ = Am/Ac = 0.6