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Arrange the following in the order of decreasing transmission power requirement:


Communication Systems MCQ Solution

Arrange the following in the order of decreasing transmission power requirement:

  • A. FM
  • B. AM
  • C. DSB-SC
  • D. VSB-SC
  • E. SSB-SC

Choose the correct answer:

  1. B, C, D, E, A
  2. B, C, E, D, A
  3. A, B, C, D, E
  4. E, D, C, B, A

Solution

Step 1: Compare AM and DSB-SC

  • AM transmits a carrier along with two sidebands.
  • A large portion of power is wasted in the carrier.
  • Therefore, AM requires more transmission power than DSB-SC.

Step 2: Compare DSB-SC, VSB-SC, and SSB-SC

  • DSB-SC transmits both sidebands.
  • VSB-SC transmits one complete sideband and a vestige of the other.
  • SSB-SC transmits only one sideband.

Hence:
DSB-SC > VSB-SC > SSB-SC

Step 3: Compare FM with Amplitude Modulation Schemes

  • FM has constant amplitude.
  • FM has more bandwidth.
  • Transmission power is independent of modulation index.
  • For the same coverage and noise performance, FM generally requires the more transmission power among the given options.

Step 4: Arrange in decreasing order of power requirement

FM > AM > DSB-SC > VSB-SC > SSB-SC >

Therefore, the correct order is:
A, B, C, D, E

Correct Option: 3

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