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EEE :: A.C Fundamentals, Circuits and Circuit Theory

  1. All the rules and laws of D.C. circuit also apply to A.C. circuit containing

  2. A.

     Capacitance only

    B.

     Inductance only

    C.

     Resistance only

    D.

     All above

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  3. The equation of 50 Hz current sine wave having r.m.s. value of 60 A is

  4. A.

     60 sin 25 t

    B.

     60 sin 50 t

    C.

     84.84 sin 3141

    D.

     42.42 sin 314 t

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  5. In a pure inductive circuit if the supply frequency is reduced to 1/2, the current will

  6. A.

     Be reduced by half

    B.

     Be doubled

    C.

     Be four times as high

    D.

     Be reduced to one fourth

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  7. In a pure capacitive circuit if the supply frequency is reduced to 1/2, the current will

  8. A.

     Be reduced by half

    B.

     Be doubled

    C.

     Be four times at high

    D.

     Be reduced to one fourth

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  9. A sine wave has a frequency of 50 Hz. Its angular frequency is __________ radian/second.

  10. A.

     100 n

    B.

     50 jt

    C.

     25 JT

    D.

     5 n

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  11. Skin effect occurs when a conductor carries current at _________ frequencies.

  12. A.

     Very low

    B.

     Low

    C.

     Medium

    D.

     High

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  13. In a parallel R-C circuit, the current always _________the applied voltage

  14. A.

     Lags

    B.

     Leads

    C.

     Remains in phase with

    D.

     None of the above

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  15. A pure capacitor connected across an A.C. voltage consumed 50 W. This is due to

  16. A.

     The capacitive reactance in ohms

    B.

     The current flowing in capacitor

    C.

     The size of the capacitor being quite big

    D.

     The statement is incorrect

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  17. Time constant of a capacitive circuit

  18. A.

     Increases with the decrease of capacitance and decrease of resistance

    B.

     Increases with the decrease of capacitance and increase of resistance

    C.

     Increases with the increase of capacitance and decrease of resistance

    D.

     Increase with increase of capacitance and increase of resistance

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  19. Capacitive reactance is more when

  20. A.

     Capacitance is less and frequency of supply is less

    B.

     Capacitance is less and frequency of supply is more

    C.

     Capacitance is more and frequency of supply is less

    D.

     Capacitance is more and frequency of supply is more

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