AM signal - Transmission efficiency & Synchronous detection

Q.  What is the maximum transmission efficiency of an AM signal?
- Published on 13 Oct 15

a. 64.44%
b. 33.33%
c. 56.66%
d. 75.55%

ANSWER: 33.33%
 
The transmission efficiency (η) of AM wave is defined as the percentage of total power contributed by side bands of the AM signal. The maximum transmission efficiency of an AM signal is 33.33%, i.e., only one third of the total transmitted power is carried by the side bands in an AM wave. The remaining two third of the total transmitted power gets wasted.

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