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Electrical Machines

Electrical Machines
The slip of an induction motor during DC rheostatic braking is

  2 - s.
 2 + s.
  s.
 1 - s.

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Electrical Machines
If terminal voltage of one 1000 rpm shunt motor is reduced to half the speed of the motor will be

 500 rpm
 2000 rpm
 250 rpm
 1000 rpm

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Electrical Machines
Direction of the current in the compensating winding is________ to the direction of current in the armature conductors?

 exactly opposite
 either of these
None of these
 same

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Electrical Machines
In 3 - Φ induction motor some times copper bars are placed deep in the rotor to

  improve starting torque.
  improve efficiency.
  reduce copper loss.
  improve power factor.

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Electrical Machines
What is power factor of a 3 - φ induction motor at no load?

  High.
  Same as full load.
  Low.
  Equal to 1.

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Electrical Machines
Which of the following induction motor has the highest starting torque?

 Slip ring induction motor.
None of these
 Same in both induction motors.
 Squirrel cage induction motor.

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