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ECE :: Signals and Systems

  1. The system with given pole-zero diagram is

  2. A.
    casual
    B.
    non-casual
    C.
    both sided
    D.
    not-possible

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  3. A pole zero pattern of a certain filter is shown in figure. This filter must be

  4. A.
    LPF
    B.
    BFP
    C.
    HPF
    D.
    APF

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  5. If transfer function of a system is H(z) = 6 + z-1 + z-2 then system is

  6. A.
    minimun phase
    B.
    maximum phase
    C.
    mixed phase
    D.
    none

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  7. The period of the function cos is

  8. A.
    B.
    8s
    C.
    4s
    D.

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  9. Let x(t) and y(t) with F.T. x(f) and y(f) respectively be related as shown in figure

    Then y(f) is

  10. A.
    B.
    C.
    -X(f/2)ej2pf
    D.
    -X(f/2)e- j2pf

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  11. Which one is a linear system?

  12. A.
    y[n] = x[n] x x[n - 1]
    B.
    y[n] = x[n] + x[n - 10]
    C.
    y[n] = x2[n]
    D.
    (a) and (c)

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  13. Laplace transform of a pulse function of magnitude E and duration from t = 0 to t = a is

  14. A.
    E / s
    B.
    C.
    D.

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  15. The continuous time system with impulse response h(t) = is stable, for n is even, when

  16. A.
    a = 0
    B.
    a > 0
    C.
    a < 0
    D.
    a ≤ 0

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  17. If I (s) , initial value of i(t) is

  18. A.
    5A
    B.
    12.5 A
    C.
    0.05 A
    D.
    1250 A

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  19. If then for this to be true x(t) is

  20. A.
    exp (j2p f/t)
    B.
    exp (-j2p f/t)
    C.
    exp (j2p ft)
    D.
    exp (-j2p f/t)

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