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ECE :: Exam Questions Paper

  1. Which of the following uses 'transferred electron effect' for production of microwaves?

  2. A.
    Silicon
    B.
    Germanium
    C.
    Metal-semiconductor junction
    D.
    Gallium Arsenide

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  3. The figures shows the symbol of

  4. A.
    p channel depletion MOSFET
    B.
    p channel enhancement MOSFET
    C.
    complementary MOSFET
    D.
    p channel JFET

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  5. The spectral range of a band pass signal extends from 10 MHz to 10.4 MHz. What is the minimum sampling frequency required for reconstruction?

  6. A.
    20 MHz
    B.
    20.8 MHz
    C.
    20.4 MHz
    D.
    0.8 MHz

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  7. All poles and zeros of a driving point immittance function of an L-C network

  8. A.
    should lie on the jω axis
    B.
    should lie on the +ve real axis
    C.
    should lie on the - ve real axis
    D.
    can lie anywhere in s-plane

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  9. In 8085 microprocessor, the interrupt enable flip-flop is reset by

  10. A.
    DI instruction only
    B.
    system RESET only
    C.
    interrupt acknowledgment only
    D.
    all of the above

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  11. The transfer function of a linear-time invariant system is given as What is the steady-state value of the unit-impulse response?

  12. A.
    Zero
    B.
    One
    C.
    Two
    D.
    Infinite

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  13. When transistor is used as a switch __________ is defined as the interval which elapses between the transition of input waveform and the time when to transition to 90% of Ic(sat).

  14. A.
    storage time
    B.
    fall time
    C.
    turn-on time
    D.
    turn-off time

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  15. Which of the following is a circularly polarized antenna?

  16. A.
    Horn
    B.
    Dipole
    C.
    Helical
    D.
    Pyramidal

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  17. Transfer function of a certain system is

    Which one of the following will be the A, B matrix pair of state variable representation of this system?

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  19. As per Hall effect, if any specimen carrying a current I is applied in a transverse magnetic field B, then an electric field E is induced in the specimen in the direction.

  20. A.
    parallel to I
    B.
    perpendicular to B and parallel to I
    C.
    parallel to I and B
    D.
    perpendicular to both I and B

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