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

Related Mcqs:

1. 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...

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

   A. high inductance of field and armature circuits B. induced current in rotor due to variations of flux C. fine copper wire winding D. none of the above...

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

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

4. 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...

5. 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...

6. 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...

7. In case of a reluctance motor, when the load is increased so that it cannot maintain synchronous speed the motor will_____________?

   A. become unstable B. draw excessive armature current and may burn out C. fall out of synchronism and come to stand still D. run as induction motor...

8. In a capacitor start and run motors the function of the running capacitor in series with the auxiliary winding is to_______________?

   A. improve power factor B. increase overload capacity C. reduce fluctuations in torque D. to improve torque...

9. Which of the following motor will give the highest starting torque ?

   A. D.C. shunt motor B. Schrage motor C. Repulsion start and induction run motor D. Universal motor...

10. The speed of a universal motor is usually reduced by using____________?

    A. gearing B. belts C. brakes D. chains...