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ECE :: Exam Questions Paper

  1. Consider the following network function

    In order to make N(s) as rational network function, it is essential to include

  2. A.
    zero at origin
    B.
    zero at infinity
    C.
    pole at origin
    D.
    pole at infinity

  3. For the polynomial P(s) = s5 + s4 + 2s3 + 2s2 + 3s + 15 The number of roots which lie in the right half of the s plane is :

  4. A.
    4
    B.
    2
    C.
    3
    D.
    1

  5. Noise with double-sided power spectral density of K overall frequencies is passed through a RC low pass filter with 3 dB cut-off frequency of fc. The noise power at the filter output is

  6. A.
    K
    B.
    Kfc
    C.
    Kpfc
    D.

  7. The energy stored in a magnetic field is given by


  8. Which of the following describe the correct properties of an emitter follower circuit?

    1. It is a voltage series feedback circuit.
    2. It is a current series feedback circuit.
    3. Its voltage gain in less than unity.
    4. Its output impedance is very low.
    Select the correct answer from the codes given below:

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

  10. For pole-zero plot shown, the system is __________ .

  11. A.
    minimum phase
    B.
    maximum phase
    C.
    mixed phase
    D.
    none of these

  12. Which of the following equations results from the circuital form of Ampere's law?

  13. A.
    B.
    ∇ . B = 0
    C.
    ∇ . B = r
    D.

  14. Which one of the following is not LED material?

  15. A.
    GaAs
    B.
    GaP
    C.
    SiC
    D.
    SiO2

  16. Consider the following statements:

    1. A flip-flop is used to store 1-bit of information.
    2. Race-around condition occurs in a J-K flip-flop when both the inputs are 1.
    3. Master-slave configuration is used in flip-flops to store 2-bits of information
    4. A transparent latch consists of a D-type flip-flop.
    Which of the above statements is/are correct?

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

  18. A balanced modulator is used in the generation of which of the following?

  19. A.
    DSB-SC signal
    B.
    FM signal
    C.
    PM signal
    D.
    PAM signal