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Doctors Medicines MCQs Q&A

  1. 1, 2 and 3 only
  2. 1, 3 and 4 only
  3. 2 and 4 only
  4. 1, 2, 3 and 4
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Option 2 : 1, 3 and 4 only

The features of modulation are :

  • Modulation is the process of increasing the frequency of the signal to reduce the antenna height requirement. This is because the antenna height must equal to λ/4, for effective transmission. (Statement 3 is correct)
  • Modulation enables Multiplexing of several message signal on a given channel, which is helpful in the transmission of different frequency signals through a single channel. (Statement 1 is correct)
  • The Bandwidth requirement is increased when the message signal is modulated. This is primarily because the spectrum of the message signal is shifted by the presence of the carrier. (Statement 2 is not correct)
  • No signal mixing so it provides better reception of message signal.
  • It helps in transmitting message signals over long distances. (Statement 4 is correct)
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