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Electrical Machines

Electrical Machines
In an induction motor, the no-load slip is generally equal to

 4 %.
  less than 1 %.
 1.5 %.
  zero.

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Electrical Machines
A crusher is equipped with

 Synchronous motor.
 DC shunt motor.
 Slip ring induction motor.
 Reluctance motor.

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Electrical Machines
Counter emf of a DC motor

 aids applied voltage.
 regulates its armature voltage.
 exceeds supply voltage
 helps in energy conversion.

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Electrical Machines
DC generator will not build up voltage

 due to wrong direction of rotation.
 any one of above.
 if field resistance is more than critical resistance.
  if it has lost residual magnetism.

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Electrical Machines
If the excitation is reduced, the power factor is

 unity power factor
 lagging power factor
None of these
 leading power factor

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Electrical Machines
In dc machines, the armature windings are placed on the rotor because of the necessity for

 generation of voltage
 commutation
 development of torque
 electromechanical energy conversion

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MORE MCQ ON Electrical Machines

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