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

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

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

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

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Electrical Machines
An alternator is feeding an infinite busbar. Its prime mover is suddenly shutdown. The alternator will

 start working as induction motor.
 continue to work as alternator but the direction of rotation will reverse.
 come to stand still.
 continue to work as synchronous motor with same direction of rotation.

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