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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 a single sideband suppressed carrier AM system, the modulation index is changed from 0 to 1, the power content of the signal

    2. A.
    will be quarter
    B.
    will be doubled
    C.
    will increase by 50 percent
    D.
    will increase by 25 percent

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  2. The primary colours are

    3. A.
    blue and green
    B.
    blue and red
    C.
    red and green
    D.
    blue, red and green

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  3. The most commonly used system of modulating for telegraphy is

    4. A.
    single tone modulation
    B.
    on-off keying
    C.
    frequency shift keying
    D.
    pulse code modulation

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  4. Which of the following antennas is not wide band?

    5. A.
    Marconi
    B.
    Helical
    C.
    Folded dipole
    D.
    Discone

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  5. While AM has __________ frequencies, FM has __________ number of sidebands.

    6. A.
    2, 3
    B.
    3, 3
    C.
    3, 5
    D.
    3, infinite

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  6. In VHS format diameter of head drum is about

    7. A.
    1 m
    B.
    20 cm
    C.
    6 cm
    D.
    1 cm

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  7. The correct sequence of subsystem in an FM receiver is

    8. A.
    mixer, RF amplifier, limiter, IF amplifier, discriminator, audio amplifier
    B.
    RF amplifier, mixer, IF amplifier, limiter, discriminator, audio amplifier
    C.
    RF amplifier, mixer, limiter, discriminator, IF amplifier, audio amplifier
    D.
    mixer, IF amplifier, limiter, audio amplifier, discriminator

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  8. A wave is frequency modulated with an index of 0.1 and its frequency is multiplied by 8 times, the modulation index is

    9. A.
    not changed
    B.
    decreased 8 times
    C.
    increased 4 times
    D.
    increased 8 times

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  9. Short circuited stubs are preferred to O.C stubs because

    10. A.
    O.C stubs are incapable of giving full range of reactances
    B.
    O.C stubs are liable to radiate
    C.
    O.C stubs are difficult to make and connect
    D.
    none of the above

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  10. When ωm is the modulation frequency in frequency modulation, the modulation index is proportional to

    11. A.
    ωm
    B.
    ω2m
    C.
    1/ωm
    D.
    1/ω2m

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