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
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 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
A repulsion motor is equipped with
A slip rings
B commutator
C both (A) and (B)
D none of the above
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)
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
If Bashar can run around a ground four times in 20 minutes and Rahim can run around the same ground three times in 12 minutes, who can run around that ground more times in an hour, and how many times more can he run around ?
A Bashar, three times more
B Rahim , three times more
C They both go around 12 times
D Bashar, eight times more
A synchronous motor has better power factor as compared to that of an equivalent induction motor. This is mainly because
A synchronous motor has no slip
B stator supply is not required to produce magnetic field
C mechanical load on the rotor remains constant
D synchronous motor has large airgap

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