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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. Which of following digital modulation technique?

    2. A.
    ASK
    B.
    FSK
    C.
    PSK
    D.
    All

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  2. A discrete zero memory information source has 40 symbols and each symbol is equally likely. The minimum number of bits required to code the source with uniform length code and entropy of the source are

    3. A.
    5 and 5.03
    B.
    6 and 5.83
    C.
    5 and 6.64
    D.
    6 and 5.32

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  3. The standard intermediate frequency for FM ratio is

    4. A.
    10.7 MHz
    B.
    4.5 MHz
    C.
    75 kHz
    D.
    455 kHz

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  4. In an end fire array, the radiation pattern

    5. A.
    is in the plane of array
    B.
    is at right angles to array
    C.
    is at an angle to the plane of array
    D.
    either (b) or (c)

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  5. Armstrong FM transmitter uses

    6. A.
    LC oscillator
    B.
    crystal oscillator
    C.
    RC oscillator
    D.
    either (a) or (c)

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  6. An antenna having a length of and grounded at one end is called

    7. A.
    Marconi antenna
    B.
    Yagi antenna
    C.
    Turnstile antenna
    D.
    None of the above

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  7. The noise figure of individual stages of a two stage amplifier is 2.03 and 1.54 respectively. If gain of first stage is 62, the overall noise figure is

    8. A.
    2.03
    B.
    2.055
    C.
    3.05
    D.
    6.05

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  8. In figure (A) and (B)

    9. A.
    A represents PCM and B represents AM
    B.
    A represents FM and B represents AM
    C.
    A represents AM and B represents FM
    D.
    A represents PCM and B represents FM

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  9. A trinitron colour picture tube uses

    10. A.
    three electron guns
    B.
    one electron gun
    C.
    one electron gun with three separate in line cathodes
    D.
    none of the above

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  10. For a three stage cascaded amplifier, having gains of G1, G2 and G3 and noise figures of F1, F2, F3 the overall noise figure

    11. A.
    B.
    C.
    D.
    None of the above

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