Electrical Machines
The power input to a 3 - φ induction motor is 60 kW and stator loss is 1 kW the rotor cu loss per phase is

 1.
  slip X 50 / 3.
  slip X 59 / 3.
  slip X 69 / 3.

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Electrical Machines
Two dc machines A and B, using the same conductor material, have armature circuit resistances of 0.4 Ω and 1.2 Ω respectively. Of the two machines,

 A is bigger than B for the same voltage rating
 B is bigger than A for the same current rating
 A is bigger than B for the same current rating
 both are of the same size for the same current rating

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Electrical Machines
When the supply terminal of a DC shunt motor are interchanged

  The motor will run at its normal speed in the same direction as before.
 The motor will stop.
 The motor will run much faster in the same direction.
 The direction of rotation will reverse.

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