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Question 20314
JEE Physics · Medium

Principles of Communication: Amplitude Modulation MCQ

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Amplitude ModulationMediumQuestion 20314

Question

In an AM transmitter, the modulation index must be kept ≤ 1 to avoid:
  1. A
    Over-heating
  2. B
    Over-modulation and distortion
    Correct
  3. C
    Under-power operation
  4. D
    Phase drift

Correct answer

Over-modulation and distortion

Explanation

μ > 1 means the carrier is turned off during part of the cycle → the envelope no longer faithfully follows the message → severe nonlinear distortion at the demodulator output.

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