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Exam Questions Paper - Section 15
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Exam Questions Paper - Section 22

  1. Signal x(t) is shown below:

    The values of `t' for which x(3t - 2) will be zero are:

    2. A.
    0,
    B.
    C.
    D.

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  2. Costa's receiver is used for

    3. A.
    Coherent detection of AM-SC signal
    B.
    Asynchronous detection of AM-SC signal
    C.
    Coherent detection of DSB-SC signal
    D.
    Asynchronous detection of DSB-SC signal

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  3. The maximum concentration of the element which can be dissolved in solid silicon at a given temperature is termed as

    4. A.
    Solid solubility
    B.
    Dissolution coefficient
    C.
    Solidification index
    D.
    Concentration index

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  4. What is the purpose of DMA facility in microprocessor based system?

    5. A.
    To increase the speed of data transfer between the mP and the I/O devices
    B.
    To increase the speed of data transfer between the mP and the memory
    C.
    To increase the speed of data transfer between the memory and the I/O devices
    D.
    To improve the reliability of the system

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  5. The fuse material used in electrical lines must have which one of the following properties?

    6. A.
    High resistivity
    B.
    Low conductivity
    C.
    High melting point
    D.
    Low melting point

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  6. With respect to transmission parameters, which one of the following is correct?

    7. A.
    A and B are dimensionless
    B.
    B and C are dimensionless
    C.
    A and D are dimensionless
    D.
    B and D are dimensionless

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  7. For detecting a sequence 1011 which is the correct state diagram representation.

    8. A.
    B.
    C.
    D.
    none of these

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  8. In the circuit, shown in figure, V0 = Vi. The values of 1, m, n are: (x represents don't care conditions)

    9. A.
    0, 1, 1
    B.
    ∞, x, x
    C.
    x, ∞, x
    D.
    0, x, ∞

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  9. In the design of a single mode step index optical fiber close to upper cut-off, the single mode operations is NOT preserved if

    10. A.
    radius as well as operating wavelength are halved
    B.
    radius as well as operating wavelength are doubled
    C.
    radius is halved and operating wavelength is doubled
    D.
    radius is doubled and operating wavelength is halved

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  10. For a message signal m(t) = cos (2pfmt) and the carrier frequency fc, which of the following represents a single side band (SSB) signal?

    11. A.
    cos (2pfmt) cos (2pfct)
    B.
    cos (2pfct)
    C.
    cos [2p(fc + fm) t]
    D.
    [1 + cos (2pfmt) cos (2pfct)]

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