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ECE :: Exam Questions Paper

  1. The electric field of 2.5 x 107 V/m can give 1 eV energy to condition electron, then in a copper block what will be the mean free path of electron?

  2. A.
    5 x 10-8 m
    B.
    4 x 10-7 m
    C.
    0.4 m
    D.
    0.5 m

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  3. 25 persons are in a room. 15 of them play hockey, 17 of them play football and 10 of them play both hockey and football. Then the number of persons playing neither hockey nor football is:

  4. A.
    2
    B.
    17
    C.
    13
    D.
    3

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  5. For the circuit shown in the following figure I0-I3 are inputs to the 4:1 multiplexer R(MSB) and S are control bits

    The output Z can be represented by

  6. A.
    PQ + PQ S + Q R S
    B.
    P Q + PQ R + P Q S
    C.
    P Q R + P QR + PQRS + Q R S
    D.
    PQ R + PQR S + P Q R S + Q R S

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  7. The transfer function of a system is . For a unit-step input to the system the approximate setting time for 2% criterion is :

  8. A.
    100 sec
    B.
    4 sec
    C.
    1 sec
    D.
    0.01 sec

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  9. The Nyquist sampling interval, for the signal sine (700t) + sine (500t) is

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  11. The impulse response of an initially relaxed linear system is e-2tu(t) . To produce a response te-2tU(t), the input must be equal to __________ .

  12. A.
    e-2t U(t)
    B.
    e-lt U(t)
    C.
    e-1u(t)
    D.

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  13. The continuous time system with impulse response h(t) u(t) is stable, if __________ (n is even).

  14. A.
    a = 0
    B.
    a > 0
    C.
    a < 0
    D.
    none of these

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  15. Consider the following diagrams showing vector fields :
    The correct statements are

  16. A.
    For figure (a), ∇ . = 0, ∇ x = 0
    B.
    For figure (a), ∇ . = 0, ∇ x ≠ 0
    C.
    For figure (b), ∇ . = 0, ∇ x ≠ 0
    D.
    For figure (c), ∇ . = 0, ∇ x ≠ 0

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  17. In the signal flow graph of figure, y/x equals.

  18. A.
    3
    B.
    5/2
    C.
    2
    D.
    None of the above

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  19. Find resistance RB to bring transistor to threshold of saturation (VCB = 0), VBE = 0.7 V, a = 0.96

  20. A.
    1.5 KΩ
    B.
    15 KΩ
    C.
    10 KΩ
    D.
    1 KΩ

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