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ECE :: Signals and Systems

  1. In a network V(s) = Z(s) I(s) where V(s), Z(s) and I(s) are Laplace transforms of v(t), z(t) and i(t). The voltage v(t) is

  2. A.
    v(t) = z(t) i(t)
    B.
    C.
    D.
    v(t) = z(t) + i(t)

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  3. For formation of state equations, resistance of the circuit

  4. A.
    should be in tree
    B.
    should be in cotree
    C.
    may be in tree or cotree
    D.
    none of the above

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  5. In a Communication system, noise is most likely to affect the signal.

  6. A.
    at the transmitter
    B.
    In the channel
    C.
    in Information source
    D.
    at the destination

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  7. As per mormal distribution the probability of an error between limits a and b is

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  9. If the sequence |xn|1/n converges, then the series converages absolutely is

  10. A.
    Ratio test
    B.
    Root test
    C.
    Convergence test
    D.
    Divergence test

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  11. If X(a) is the z transform of kxk, then the z transform of k xk is

  12. A.
    True
    B.
    False

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  13. The value of K in function f(x) = K(x - 1) for K = 1 < x < 4

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  15. A system is said to be static system, when present output depend upon

  16. A.
    present I/P
    B.
    presrent and past
    C.
    present and future
    D.
    past and future

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  17. The function f(t) = E[u(t - a) - u(t - b)] is

  18. A.
    a pulse function originating at t = a
    B.
    a step function orginating at t = 0
    C.
    an exponential function originating at t = a
    D.
    a pulse function originating at t = a and duration (b - a)

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  19. If two mutually exclusive events A and B can happen in m and n ways, then either A or B can happen in (m + n) ways.

  20. A.
    True
    B.
    False

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