Consider sinusoidal modulation in an AM system. Assuming no over-modulation, the modulation index (𝜇) when the maximum and minimum values of the envelope, respectively, are 3 V and 1 V is ________.

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UPPSC AE Electrical 2019 Official Paper II (Held on 13 Dec 2020)
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  1. 0.8
  2. 0.5
  3. 0.2
  4. 0.1

Answer (Detailed Solution Below)

Option 2 : 0.5
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Detailed Solution

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Concept:

A single tone modulated signal is given as:

Maximum envelope Amax : A(1+μ)

Minimum envelope Amin : A(1-μ)

The above can be written as:

Calculation:

Given:  Amax = 3 V and Amin = 1 V

The modulation index will be:

μ = 0.5

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