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ECE :: Exam Questions Paper

  1. Which one of the following is a trivalent material?

  2. A.
    Antimony
    B.
    Phosphorus
    C.
    Arsenic
    D.
    Boron

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  3. In orthogonal BFSK. the energy of information bearing term is :

  4. A.
    the same as total transmitted energy
    B.
    one half of total transmitted energy
    C.
    one fourth of total transmitted energy
    D.
    None

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  5. The maximum positive and negative numbers which can be represented in 2's complement form using n bits are respectively

  6. A.
    +(2n + 1 - 1), - (2n - 1 - 1)
    B.
    +(2n + 1 - 1), - 2n - 1
    C.
    +2n - 1, - 2n - 1
    D.
    +2n + 1, - (2n - 1 + 1)

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  7. What is the chemical bonding in silicon semiconductor?

  8. A.
    Metallic
    B.
    Ionic
    C.
    Covalent
    D.
    van der Waals

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  9. The probability density function of the envelope of narrow band noise is :

  10. A.
    Uniform
    B.
    Gaussian
    C.
    Rayleigh
    D.
    None

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  11. If (10)x x (10)x = (100)x; (100)x x (100)x = (10000)x then x can take value :

  12. A.
    2
    B.
    5
    C.
    10
    D.
    all of these

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  13. Laplace transform of

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  15. In a uniformly doped BJT, assume that NE, NB and NC are the emitter, base and collector dopings in atoms/cm3, respectively. If the emitter injection efficiency of the BJT is close unity, which one of the following conditions is TRUE?

  16. A.
    NE = NB = NC
    B.
    NE >> NB and NB > NC
    C.
    NE = NB and NB < NC
    D.
    NE < NB < NC

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  17. Consider the following statements about ultrasonic flow meters:

    1. The measurement in insensitive to viscosity, pressure and temperature variations.
    2. It has bidirectional measuring capability and can be used for any pipe size.
    3. It has a relatively lower cost.
    4. It has good accuracy, fast response and wide frequency range.
    Which of the above statements is/are correct?

  18. A.
    1 only
    B.
    1 and 2 only
    C.
    1, 2 and 4
    D.
    3 and 4 only

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  19. The number of essential prime implicant for the logic expression
    F = ABC + C D A + CDA + ABC + BD

  20. A.
    3
    B.
    5
    C.
    4
    D.
    6

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