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ECE :: Exam Questions Paper

  1. It is very likely in __________ gate family that when one gate is driving number of gates in __________ , a gate having least voltage for saturation may consume large __________ leaving other gates inoperative and this phenomenon is called __________ .

  2. A.
    DTL, parallel, current, current - sinking
    B.
    DCTL, parallel, current, current-lagging
    C.
    ECL, series, voltage, voltage-deterioration
    D.
    DCTL, series, current, current-lagging

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  3. The unit step response of an under damped second system has steady state value of - 2. Which one of the following transfer functions has these properties?

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  5. For a system with transfer function

    The bandwidth of the system is (rad/sec)

  6. A.
    2.828
    B.
    5.2915
    C.
    5.088
    D.
    cannot be determined

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  7. Consider the following:

    1. Distortion
    2. Gain
    3. Bias stabilization
    4. Sensitivity
    5. Frequency response
    Which of these properties of the power amplifier one should concentrate upon while designing a good power amplifier circuit?

  8. A.
    1, 2 and 3
    B.
    1, 3 and 5
    C.
    2, 3 and 4
    D.
    4 and 5

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  9. In the silicon BJT circuit shown below, assume that the emitter area of transistor Q1 is half that of transistor Q2.

    The value of current I0 is approximately

  10. A.
    0.5 mA
    B.
    2 mA
    C.
    9.3 mA
    D.
    15 mA

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  11. A silicon wafer has 100 nm of oxide it and is inserted in a furnace at a temperature above 1000°C for further oxidation in dry oxygen. The oxidation rate

  12. A.
    is independent of current oxide thickness and temperature
    B.
    is independent of current oxide thickness but depends on temperature
    C.
    slows down as the oxide grows
    D.
    is zero as the existing oxide prevents further oxidation

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  13. When a vector has positive divergence, it indicates that the vector quantity has at that point and if the divergence is negative, it indicates __________ .

  14. A.
    source, sink
    B.
    sink, source
    C.
    positive value, negative value
    D.
    negative value, positive value

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  15. A function of one of more variables which conveys information on the nature of physical phenomenon is called

  16. A.
    Noise
    B.
    Interference
    C.
    System
    D.
    Signal

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  17. A current source with three basic transistors is shown. All transistors are similar. All are having finite current gain β

    Then I0 is

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  19. Which of the following represent a wave equation for a tightly stretched elastic string of length l and 'm', mass per unit?

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