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Question 20231
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Principles of Communication: Amplitude Modulation MCQ

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Amplitude ModulationEasyQuestion 20231

Question

The modulation index μ of an AM signal is defined as:
  1. A
    μ = A_c / A_m
  2. B
    μ = A_m / A_c
    Correct
  3. C
    μ = (A_c + A_m) / 2
  4. D
    μ = A_m × A_c

Correct answer

μ = A_m / A_c

Explanation

μ = Am/Ac where Am is message amplitude and Ac is carrier amplitude. For undistorted AM, μ ≤ 1 (i.e., 0–100%).

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