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ECE :: Signals and Systems

  1. A voltage wave having 5% fifth harmonic content is applied to a series RC circuit. The percentage fifth harmonic content in the current wave will be

  2. A.
    5%
    B.
    more than 5%
    C.
    less than 5%
    D.
    equal or more than 5%

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  3. Assertion (A): If , the initial value of i(t) is 5A

    Reason (R): As per initial vaue theroem

  4. A.
    Both A and R are correct and R is correct explanation of A
    B.
    Both A and R are correct but R is not correct explanation of A
    C.
    A is true, R is false
    D.
    A is false, R is true

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  5. δ(t) is a

  6. A.
    energy signal
    B.
    power signal
    C.
    neither energy nor power
    D.
    none

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  7. The analog signal given below is sampled by 600 samples per second for m(t) = 3 sin 500 pt + 2 sin 700 pt then folding frequency is

  8. A.
    500 Hz
    B.
    700 Hz
    C.
    300 Hz
    D.
    1400 Hz

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  9. The signal defined by the equations f(t) = 0 for t < 0, f(t) = E for 0 ≤ ta and f(t) = 0 for t > a is

  10. A.
    a step function
    B.
    a pulse function
    C.
    a shifted step function originating at t = a
    D.
    none of the above

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  11. Inverse Laplace transform of is

  12. A.
    2 exp (- 2.5 t) cosh (0.5 t)
    B.
    exp (- 2 t) + exp (- 3 t)
    C.
    2 exp (- 2.5 t) sinh (0.5 t)
    D.
    2 exp (- 2.5 t) cos 0.5 t

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  13. Two function g1(t) and g2(t) with correlation of 6 has average power of 4 and 5 respectively. The power of g1(t) + g2(t) is

  14. A.
    9
    B.
    21
    C.
    3
    D.
    15

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  15. A box has 4 white and 3 red balls. Two balls are taken out in succession. What is the probability that both are white?

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  17. Z transform is a non-linear operation.

  18. A.
    True
    B.
    False

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  19. A signal g(t) = A then g(t) is a

  20. A.
    energy signal
    B.
    power signal
    C.
    neither energy nor power signal
    D.
    insufficient data

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