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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. The main advantage of superheterodyne receiver is

    2. A.
    better tracking
    B.
    simple cut
    C.
    better alignment
    D.
    improvement in selectivity and sensitivity

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  2. PAL system was proposed first in

    3. A.
    USA
    B.
    Japan
    C.
    England
    D.
    Germany

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  3. MCVF telegraphy causes

    4. A.
    SSB techniques
    B.
    pulse modulation
    C.
    Out of bond signalling
    D.
    FM

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  4. Consider the following statements as regards noise

    1. If Gaussian noise is applied at input of a rectifier, the output is not gaussian
    2. The noise encountered on a telephone line consists of short, pulse type disturbances whose amplitude distribution is not Gaussian
    3. Shot noise results from random emission of electrons from a cathode
    4. Shot noise results from phenomenon associated with the flow of current across semi conductor junctions
    Which of the above are correct?

    5. A.
    1, 2, 3, only
    B.
    1, 2, 4 only
    C.
    1, 2, 3, 4
    D.
    2, 3 only

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  5. Noise can be reduced by increasing sampling rate

    6. A.
    true
    B.
    false
    C.
    can't say
    D.
    insufficient data

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  6. In tape recorder erase head is active during recording.

    7. A.
    True
    B.
    False

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  7. Which of the following microphones has maximum distortion?

    8. A.
    Ribbon
    B.
    Condenser
    C.
    Crystal
    D.
    Carbon

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  8. The relation between bandwidth B, modulating frequency fm and frequency deviation Δf for a sinusoidally modulated FM signal is

    9. A.
    B = Δf + fm
    B.
    B = 2(Δf + fm)
    C.
    B = fm - Δf/
    D.
    B = 2(fm - Δf)

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  9. FM broadcast is used in

    10. A.
    VHP range
    B.
    UHF range
    C.
    MF range
    D.
    both VHP and UHF range

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  10. The power requirement of a RADAR used in military operations is

    11. A.
    a few watts
    B.
    about 500 W
    C.
    about 2000 W
    D.
    a few megawatts

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