A. provide mechanical balance
B. improve power factor and provide better speed regulation
C. prevent hunting in the motor
D. eliminate armature reaction
Related Mcqs:
- 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 - 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 - The repulsion-start induction-run motor is used because of___________?
A. good power factor
B. high efficiency
C. minimum cost
D. high starting torque - 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 - 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 - 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 - 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) - A repulsion motor is equipped with__________?
A. slip rings
B. commutator
C. both A. and (b)
D. none of the above - In which single-phase motor, the rotor has no teeth or winding ?
A. Split phase motor
B. Reluctance motor
C. Hysteresis motor
D. Universal motor - 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
