WorksheetsAmplitude modulation power calculations
Total questions: 7
Worksheet time: 4mins
An AM transmitter has a carrier power Pc=200 W and modulation index m=0.6. The total transmitted power is:
272 W
236 W
248 W
212 W
Which statement about AM power distribution is true?
Each sideband carries 2m2Pc power
Total sideband power is always greater than carrier power for m ≤ 1
Sidebands share power equally
Reducing m increases total transmitted power
Why is AM transmission considered inefficient in terms of power usage?
Because the carrier contains no information but consumes most of the power
Because sidebands have unequal power
Because m is always less than 1
Because bandwidth is too large
If the carrier is removed entirely, but both sidebands are transmitted, the resulting system is:
Standard AM
SSB
DSB-SC
FM
In standard AM, most of the transmitted power is in:
The Carrier
The upper sideband
The lower Sideband
Equally shared between sidebands and carrier
In AM, sideband power is proportional to:
m
m2
m3
m
If μ is too small (close to zero) in AM, which is the main drawback?
Power efficiency is low because most power is wasted in carrier
Bandwidth becomes too large
Sidebands dominate and cause interference
Phase distortion occurs
