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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

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  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

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  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

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

  8. A.

     Crystal

    B.

     Wien-bridge

    C.

     Phase-shift

    D.

     Hartley

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

  10. A.

     Space

    B.

     An antenna

    C.

     Cable

    D.

     None of the above

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  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

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  13. Overmodulation results in ___________

  14. A.

     Weakening of the signal

    B.

     Excessive carrier power

    C.

     Distortion

    D.

     None of the above

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  15. The letters AVC stand for ___________

  16. A.

     Audio voltage control

    B.

     Abrupt voltage control

    C.

     Automatic volume control

    D.

     Automatic voltage control

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  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

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  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

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