Communication miscellaneous

Communication miscellaneous

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Communication

Communication miscellaneous
  1. In NBFM, the maximum modulation frequency is 3 kHz and maximum deviation is 5 kHz. The modulation index is—








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    For NBFM modulation index < 1

    Correct Option: C

    For NBFM modulation index < 1

  1. The threshold in FM depends on—








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    When the carrier to noise ratio is slightly less than unity, the frequency of spike generation is small, and each spike produces individual clicking sound in the receiver. But, when the carrier to noise ratio is further decreased so that the ratio is moderately less than unity, the spikes are generated rapidly and the clicks merge into sputtering sound. This phenomenon is known as threshold effect in FM. and the level of threshold depends upon the frequency deviation and power level of frequencies radiated at the receiver.

    Correct Option: C

    When the carrier to noise ratio is slightly less than unity, the frequency of spike generation is small, and each spike produces individual clicking sound in the receiver. But, when the carrier to noise ratio is further decreased so that the ratio is moderately less than unity, the spikes are generated rapidly and the clicks merge into sputtering sound. This phenomenon is known as threshold effect in FM. and the level of threshold depends upon the frequency deviation and power level of frequencies radiated at the receiver.

  1. FM broadcast band lies in—








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    NA

    Correct Option: A

    NA

  1. An increase in the modulation index leads increase in bandwidth in case of—








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    Refer synopsis

    Correct Option: B

    Refer synopsis

  1. Which of the following process is a linear modulation process?








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    NA

    Correct Option: C

    NA