Electrical Machines
A 400 V, 50 Hz, 30 Hp, three phase IM is drawing 50 A current at 0.8 p.f lagging. The stator and rotor copper losses are 1.5 KW and 900 W respectively. The friction and windage losses are 1050 W and core losses are 1200 W. The air gap power of the motor will be

 24.11 kW.
 26.21 kW.
 25 kW.
 23.06 kW.

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Electrical Machines
In a stepper motor the detente torque means

  maximum of the static torque with the phase winding unexcited.
  maximum of the static torque with the phase winding excited.
  minimum of the static torque with the phase winding unexcited.
  minimum of the static torque with the phase winding excited.

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Electrical Machines
In a star - delta starting of an IM

  line voltage is 57.7 % of stator voltage.
  resistance is inserted in the rotor.
  reduced voltage is applied to the stator.
  applied voltage per stator phase is 57.7 % of a line volt

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