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Question 20282
JEE Physics · Hard

Principles of Communication: Amplitude Modulation MCQ

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Amplitude ModulationHardQuestion 20282

Question

A 100% AM signal (μ = 1) transmits total power of 15 kW. The carrier power is:
  1. A
    7.5 kW
  2. B
    10 kW
    Correct
  3. C
    12 kW
  4. D
    5 kW

Correct answer

10 kW

Explanation

Pt = Pc(1 + μ²/2) → 15 = Pc(1 + 0.5) = 1.5Pc → Pc = 15/1.5 = 10 kW. Each sideband carries μ²Pc/4 = 2.5 kW, total sideband = 5 kW. Only 1/3 of total power carries information.

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