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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. A generator is feeding power to a transmission line of characteristic impedance Z0. The line is terminated in impedance ZL. Standing waves will be set up if

    2. A.
    ZL = Z0
    B.
    ZL < Z0
    C.
    ZL > Z0
    D.
    both (b) and (c)

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  2. In sound recording the degree of pre-emphasis is about 6 dB/ octave.

    3. A.
    True
    B.
    False

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  3. Space wave may be a direct wave or wave reflected from earth.

    4. A.
    True
    B.
    False

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  4. Radio broadcasts are generally

    5. A.
    amplitude modulation
    B.
    frequency modulation
    C.
    both amplitude and frequency modulation
    D.
    neither amplitude nor frequency modulation

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  5. If the frequency of a wave 20 Hz, the time period is

    6. A.
    20 secs
    B.
    2 secs
    C.
    0.2 secs
    D.
    0.05 secs

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  6. Which of the following is taken as reference antenna for directive gain?

    7. A.
    Half wave dipole
    B.
    Elementary doublet
    C.
    Isotropic
    D.
    Infinitesimal dipole

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  7. Push pull amplifier is

    8. A.
    voltage amplifier
    B.
    current amplifier
    C.
    power amplifier
    D.
    none of the above

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  8. When the channel is noisy, producing a conditional probability of error p = 0.5; the channel capacity and entropy function would be, respectively,

    9. A.
    1 and 1
    B.
    1 and 0.5
    C.
    0.5 and 1
    D.
    0 and 1

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  9. In CCIR-B system, the time between start of one H syn. pulse and next is

    10. A.
    64 μs
    B.
    6.4 μs
    C.
    640 μs
    D.
    0.64 μs

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  10. Counterpoise is used in coils having

    11. A.
    high resistivity
    B.
    low resistivity
    C.
    medium resistivity
    D.
    both (b) and (c)

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