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EEE :: Modulation and Demodulation

  1. In India, ___________ modulation is used for radio transmission

  2. A.

     Frequency

    B.

     Amplitude

    C.

     Phase

    D.

     None of the above


  3. When the modulating signal controls the frequency of the carrier, we get___________

  4. A.

     Phase modulation

    B.

     Amplitude modulation

    C.

     Frequency modulation

    D.

     May be any one of the above


  5. In an AM wave useful power is carrier by ___________

  6. A.

     Carrier

    B.

     Sidebands

    C.

     Both sidebands and carrier

    D.

     None of the above


  7. In a radio receiver, we generally use ___________ oscillator as a local oscillator

  8. A.

     Crystal

    B.

     Wien-bridge

    C.

     Phase-shift

    D.

     Hartley


  9. In radio transmission, the medium of transmission is ___________

  10. A.

     Space

    B.

     An antenna

    C.

     Cable

    D.

     None of the above


  11. In superhetrodyne receiver, the input at mixer stage is ___________

  12. A.

     IF and RF

    B.

     RF and AF

    C.

     IF and AF

    D.

     RF and local oscillator signal


  13. Overmodulation results in ___________

  14. A.

     Weakening of the signal

    B.

     Excessive carrier power

    C.

     Distortion

    D.

     None of the above


  15. The letters AVC stand for ___________

  16. A.

     Audio voltage control

    B.

     Abrupt voltage control

    C.

     Automatic volume control

    D.

     Automatic voltage control


  17. In a TRF radio receiver, the RF and detection stages are tuned to ___________

  18. A.

     Radio frequency

    B.

     IF

    C.

     Audio frequency

    D.

     None of the above


  19. The IF is 455 kHz. If the radio receiver is tuned to 855 kHz, the local oscillator frequency is ___________

  20. A.

     455 kHz

    B.

     1310 kHz

    C.

     1500 kHz

    D.

     1520 kHz