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ECE :: Communication Systems

Communication Systems - Section 1
Communication Systems - Section 2
Communication Systems - Section 3
Communication Systems - Section 4
Communication Systems - Section 5
Communication Systems - Section 6
Communication Systems - Section 7
Communication Systems - Section 8
Communication Systems - Section 9
Communication Systems - Section 10
Communication Systems - Section 11
Communication Systems - Section 12
Communication Systems - Section 13
Communication Systems - Section 14
Communication Systems - Section 15
Communication Systems - Section 16
Communication Systems - Section 17
Communication Systems - Section 18
Communication Systems - Section 19
Communication Systems - Section 20
Communication Systems - Section 21
Communication Systems - Section 22
Communication Systems - Section 23
Communication Systems - Section 24
Communication Systems - Section 25
Communication Systems - section-26
Communication Systems - Section-27

  1. In FM, which one is correct?

    2. A.
    The total power is equal to carrier power at 100% modulation and diminish thereafter.
    B.
    The carrier disappears at 100% modulation
    C.
    The total power is times the carrier power at 100% modulation
    D.
    The total power of the carrier and sidebands is equal to the carrier power at any modulation index.

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  2. In FM, increased depth of modulation increases

    3. A.
    modulation
    B.
    modulation index
    C.
    bandwidth
    D.
    all of the above

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  3. Which of the following frequency is likely to be associated with AM radio broadcast?

    4. A.
    1000 kHz
    B.
    100 MHz
    C.
    500 MHz
    D.
    10 GHz

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  4. In which of the following schemes are several channels interleaved and transmitted together?

    5. A.
    TDM
    B.
    FDM
    C.
    group
    D.
    subgroup

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  5. The audio frequency range is

    6. A.
    5 Hz to 1 kHz
    B.
    50 Hz to 20 kHz
    C.
    16 Hz to 20 kHz
    D.
    0 Hz to 20 kHz

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  6. Which of the following is an indirect method of generating FM?

    7. A.
    Reactance BJT modulator
    B.
    Armstrong modulation
    C.
    Varactor diode modulation
    D.
    Reactive FM modulator

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  7. Figure of merit is always unity in

    8. A.
    AM
    B.
    SSB-SC
    C.
    FM
    D.
    All

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  8. Which of the following modulation is analog in nature?

    9. A.
    PCM
    B.
    DPCM
    C.
    DM
    D.
    PDM

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  9. In the spectrum of a FM wave

    10. A.
    the carrier frequency cannot disappear
    B.
    the carrier frequency disappears when the modulation index is large
    C.
    the amplitude of any sideband depends on the modulation index
    D.
    the total number of sidebands depends on the modulation index

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  10. The gap width in audio heads is about 0.01 mm.

    11. A.
    True
    B.
    False

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