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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

  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

  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

  7. The period of the function cos is

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

  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

  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)

  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.

  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

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

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

  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)