Related Questions

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
The repulsion start induction run motor is used because of
A good power factor
B high efficiency
C minimum cost
D high starting torque
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
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)
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
D None
A wound rotor induction motor is preferred, as compared to squirrel cage induction motor, when major consideration is
A Slop speed operation
B High starting torque
C Low windage losses
D All of the above
While starting a salient pole synchronous motor by induction motor action and connecting field discharge resistance across field, starting and accelerting torque is produced by
A induction motor torque in field winding
B induction motor torque in damper winding
C eddy current and hysteresis torque in pole faces
D reHetance motor torque due to saliency of the rotor
E all of the above methods
A repulsion motor is equipped with
A slip rings
B commutator
C both (A) and (B)
D none of the above
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
In case the back e.m.f. and the speed of a D.C. motor are doubled, the torque developed by the motor will
A Remain unchanged
B Reduce to one-fourth value
C Increase four folds
D Be doubled

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