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ECE :: Exam Questions Paper

  1. The minimum energy of a photon required for intrinsic excitation is equal to

  2. A.
    energy of bottom of conduction band
    B.
    energy of top of valence band
    C.
    forbidden gap energy
    D.
    Fermi energy

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  3. The circuits with active pull up are preferred because of their stability for

  4. A.
    wired - AND operation
    B.
    wired - OR operation
    C.
    bus operated system
    D.
    reasonable dissipation and speed of operation

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  5. A scheme shown below is to generate a wide band FM modulate signal.

    Narrow band FM has carrier frequency = 400 KHz
    Deviation ratio = 0.2
    Wide band FM has carrier frequency = 100 MHz
    Deviation ratio = 6
    Local oscillator frequencies can be

  6. A.
    88 MHz, 112 MHz
    B.
    96 MHz, 104 MHz
    C.
    92 MHz, 108 MHz
    D.
    90 MHz, 110 MHz

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  7. How many maximum number of functions can be defined with two symbols which are Boolean in nature:

  8. A.
    4
    B.
    8
    C.
    2
    D.
    16

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  9. The characteristic equation of a control system is given as s4 + 4s3 + 4s2 + 3s + K = 0.
    What is the value of K for which this system is marginally stable?

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  11. The OP-AMP circuit shown above represents a

  12. A.
    high pass filter
    B.
    low pass filter
    C.
    band pass filter
    D.
    band reject filter

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  13. For a periodic signal with finite number of discontinuities in each period, at isolated points of discontinuity the series converges to __________ .

  14. A.
    difference value of signal on either side of discontinuity
    B.
    highest value of signal on either side of discontinuity
    C.
    average value of signal on either side of discontinuity
    D.
    sum of value of signal on either side of discontinuity

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  15. What is the approximate steady state current in the above circuit?

  16. A.
    50 A
    B.
    25 A
    C.
    5 A
    D.
    1 A

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  17. The following graph, the number of trees (P) and the number of cut-sets (Q) are

  18. A.
    P = 2, Q = 2
    B.
    P = 2, Q = 6
    C.
    P = 4, Q = 6
    D.
    P = 4, Q = 10

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  19. Which one of the following is used as the interface chip for data transmission between 8086 and a 16-bit ADC?

  20. A.
    8259
    B.
    8255
    C.
    8253
    D.
    8251

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