Home / ECE / Exam Questions Paper :: Section 19

ECE :: Exam Questions Paper

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

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

  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

  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)

  7. What is the chemical bonding in silicon semiconductor?

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

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

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

  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

  13. Laplace transform of


  14. 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?

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

  16. 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?

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

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

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