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Electrical Engineering QUESTION #2183
Question 1
In AM with modulation index $\mu = 0.5$, the efficiency (ratio of useful sideband power to total transmitted power) is:
  • $11.1\%$✔️
  • $25.0\%$
  • $33.3\%$
  • $20.0\%$
Correct Answer Explanation
$\eta = \frac{\mu^2/2}{1+\mu^2/2}\times100 = \frac{0.125}{1.125}\times100 \approx 11.1\%$. At $\mu=1$ (100% modulation), efficiency peaks at only $33.3\%$, illustrating DSB-FC inefficiency.