Home / EEE / A.C Fundamentals, Circuits and Circuit Theory :: section-1

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

  1. In a pure inductive circuit

  2. A.

     The current is in phase with the voltage

    B.

     The current lags behind the voltage by 90°

    C.

     The current leads the voltage by 90°

    D.

     The current can lead or lag by 90°


  3. In a pure resistive circuit

  4. A.

     Current lags behind the voltage by 90°

    B.

     Current leads the voltage by 90°

    C.

     Current can lead or lag the voltage by 90°

    D.

     Current is in phase with the voltage


  5. Capacitors for power factor correction are rated in

  6. A.

     kW

    B.

     kVA

    C.

     kV

    D.

     kVAR


  7. The power consumed in a circuit element will be least when the phase difference between the current and voltage is

  8. A.

     180°

    B.

     90°

    C.

     60°

    D.

     0°


  9. Which of the following statements pertains to resistors only?

  10. A.

     Can dissipate considerable amount of power

    B.

     Can act as energy storage devices

    C.

     Connecting them in parallel increases the total value

    D.

     Oppose sudden changes in voltage


  11. In a series L-C circuit at the resonant frequency the

  12. A.

     Current is maximum

    B.

     Current is minimum

    C.

     Impedance is maximum

    D.

     Voltage across C is minimum


  13. In a circuit containing R, L and C, power loss can take place in

  14. A.

     C only

    B.

     L only

    C.

     R only

    D.

     All above


  15. The best place to install a capacitor is

  16. A.

     Very near to inductive load

    B.

     Across the terminals of the inductive load

    C.

     Far away from the inductive load

    D.

     Any where


  17. All definitions of power factor of a series R-L-C circuit are correct except

  18. A.

     Ratio of net reactance and impedance

    B.

     Ratio of kW and kVA

    C.

     Ratio of J and Z

    D.

     Ratio of W and VA


  19. The frequency of an alternating current is

  20. A.

     The speed with which the alternator runs

    B.

     The number of cycles generated in one minute

    C.

     The number of waves passing through a point in one second

    D.

     The number of electrons passing through a point in one second