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Modulation and Demodulation - section-1
  1. A 50 kW carrier is to be amplitude modulated to a level of 85%. What is the carrier power after modulation?

    2. A.

     50 kW
    B.

     5 kW
    C.

     8 kW
    D.

     25 kW

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  2. The major advantage of FM over AM is ___________

    3. A.

     Reception is less noisy
    B.

     Higher carrier frequency
    C.

     Smaller bandwidth
    D.

     Small frequency deviation

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  3. In an AM wave, the majority of the power is in ___________

    4. A.

     Lower sideband
    B.

     Upper sideband
    C.

     Carrier
    D.

     None of the above

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  4. As the modulation level is increased, the carrier power ___________

    5. A.

     Is increased
    B.

     Remains the same
    C.

     Is decreased
    D.

     None of the above

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  5. Modulation refers to a low-frequency signal controlling the ___________

    6. A.

     Amplitude of the carrier
    B.

     Frequency of the carrier
    C.

     Phase of the carrier
    D.

     May be any of the above

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  6. In a radio receiver, noise is generally developed at ___________

    7. A.

     IF stage
    B.

     Receiving antenna
    C.

     Audio stage
    D.

     RF stage

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  7. The diode detector in an AM radio receiver is usually found ___________

    8. A.

     Before the first RF stage
    B.

     After the first RF stage
    C.

     After several stages of amplification
    D.

     None of the above

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  8. The function of ferrite antenna is to ___________

    9. A.

     Reduce stray capacitance
    B.

     Stabilise d.c. bias
    C.

     Increase the Q of tuned circuit
    D.

     Reduce noise

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  9. If Amin = 40 and Amax = 60, what is the percentage of modulation?

    10. A.

     20%
    B.

     40%
    C.

     50%
    D.

     10%

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  10. The signal voltage induced in the aerial of a radio receiver is of the order of ___________

    11. A.

     mV
    B.

     µV
    C.

     V
    D.

     None of the above

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