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Communication miscellaneous
  1. For the data given in Q. 52 what will be the new bandwidth, if modulating frequency is doubled?
    1. 170 kHz
    2. 190 kHz
    3. 180 kHz
    4. None of these
Correct Option: B

When modulating frequency is doubled, the new bandwidth BW’ is given by
BW′ = 2Δf + 2(2fm)
= 2 × 75 + 2(2 × 10) = 190 kHz


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