The repulsion-start induction-run motor is used because of___________?

Related Mcqs:

1. Which of the following statements regarding repulsion-start induction motor is incorrect ?

   A. It requires more maintenance of commutator and other mechanical devices B. It makes quite a bit of noise on starting C. In fractional horse power motors, it has replaced the capacitor motors D. It is not easily reversed...

2. Speed torque characteristic of a repulsion induction motor is similar to that of a D.C____________?

   A. shunt motor B. series motor C. compound motor D. separately excited motor...

3. 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...

4. 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...

5. In repulsion motor direction of rotation of motor____________?

   A. is opposite to that of brush shift B. is the same as that of brush shift C. is independent of brush shift...

6. In repulsion motor, maximum torque is developed when____________?

   A. brush axis is at 45° electrical to the field axis B. brush axis coincides with the field axis C. brush axis is at 90° electrical to the field axis D. none of the above...

7. In repulsion motor, zero torque is developed when___________?

   A. brush axis is 45° electrical to field axis B. brush axis coincides with the field axis C. brush axis is 90° electrical to field axis D. both B. and (c)...

8. The purpose of stator winding in the compensated repulsion motor is to_____________?

   A. provide mechanical balance B. improve power factor and provide better speed regulation C. prevent hunting in the motor D. eliminate armature reaction...

9. A repulsion motor is equipped with__________?

   A. slip rings B. commutator C. both A. and (b) D. none of the above...

10. 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...