When a D.C. series motor is connected to A.C. supply, the power factor will be low because of____________?

Related Mcqs:

1. A.C. series motor as compared to D.C. series motor has__________?

   A. smaller brush width B. less number of field turns C. more number of armature turns D. less air gap E. all of the above...

2. In a A.C. series motor armature coils are usually connected to commutator____________?

   A. through resistance B. through reactances C. through capacitors D. solidly...

3. If a D.C. series motor is operated on A.C. supply, it will____________?

   A. spark excessively B. have poor efficiency C. have poor power factor D. all of the above...

4. Which of the following motor will have relatively higher power factor ?

   A. Capacitor run motor B. Shaded pole motor C. Capacitor start motor D. Split phase motor...

5. The power factor of a single-phase induction motor is usually?

   A. lagging B. always leading C. unity D. unity to 0.8 leading...

6. In A.C. series motor compensating winding is employed to_____________?

   A. reduce the effects of armature reaction B. increase the torque C. reduce sparking at the brushes D. none of the above...

7. A capacitor-start single phase induction motor is switched on to supply with its capacitor replaced by an inductor of equivalent reactance value. It will______________?

   A. start and then stop B. start and run slowly C. start and run at rated speed D. not start at all...

8. After the starting winding of a single phase induction motor is disconnected from supply, it continues to run only on ______________?

   A. running winding B. rotor winding C. field winding D. compensating winding...

9. In case of a shaded pole motor the direction of rotation of the motor is__________?

   A. from main pole to shaded pole B. from shaded pole to main pole C. either of the above depending on voltage D. either of the above depending on power factor...

10. Two-value capacitor motor finds increased application as compressor motor in small home air-conditioners because_____________?

    A. it is comparatively cheaper B. it has almost non-destructible capacitor C. it has low starting as well as running currents at relatively high power factor D. it is quiet in operation...