A pure capacitor connected across an A.C. voltage consumed 50 W. This is due to________?

Related Mcqs:

1. An A.C. voltage is impressed across a pure resistance of 3.5 ohms in parallel with a pure inductance of impedance of 3.5 ohms?

   A. the current through the resistance is more
   B. the current through the resistance is less
   C. both resistance and inductance carry equal currents
   D. none of the above

2. A pure inductance connected across 250 V, 50 Hz supply consumes 100 W. This consumption can be attributed to_________?

   A. the big size of the inductor
   B. the reactance of the inductor
   C. the current flowing in the inductor
   D. the statement given is false

3. The power consumed in a circuit element will be least when the phase difference between the current and voltage is__________?

   A. 180″
   B. 90°
   C. 60°
   D. 0°

4. The power consumed in a circuit element will be least when the phase difference between the current and voltage is________?

   A. 180″
   B. 90°
   C. 60°
   D. 0°

5. The best place to install a capacitor is___________?

   A. very near to inductive load
   B. across the terminals of the inductive load
   C. far away from the inductive load
   D. any where

6. Power factor of an inductive circuit is usually improved by connecting capacitor to it in____________?

   A. parallel
   B. series
   C. either A. or (b)
   D. none of the above

7. The reactance offered by a capacitor to alternating current of frequency 50 Hz is 20 Q. If frequency is increased to 100 Hz, reactance becomes_______ohms?

   A. 2.5
   B. 5
   C. 10
   D. 15

8. In a pure inductive circuit___________?

   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°

9. In a pure capacitive circuit if the supply frequency is reduced to 1/2, the current will__________?

   A. be reduced by half
   B. be doubled
   C. be four times at high
   D. be reduced to one fourth

10. Pure inductive circuit takes power from the A.C. line when_________?

    A. applied voltage decreases but current increases
    B. applied voltage increases but current decreases
    C. both applied voltage and current increase
    D. both applied voltage and current decrease