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Electrical Machines

Electrical Machines
Universal motor have which of the following application?

  Lift.
  Domestic pump.
  Food mixer.
  Traction.

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Electrical Machines
Pole changing methods are suitable only for ___________ type induction motor.

  linear.
  wound.
  cage.
  none of these.

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Electrical Machines
Variation in speed by ward-Leonard control of DC motors occurs due to variation in

  Armature current.
  Field excitaion.
  Armature voltage.
  Supply voltage.

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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

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

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Electrical Machines
Which of the following pairs is/are correct?

 closed slot----- leakage flux is high
 semi closed slot-----leakage flux is moderate
 open slot----- leakage flux is less
All of these

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Electrical Machines
Reversing the direction of rotation of split phase motors is done by

 reversing the terminals of main winding.
All of these
 interchanging the capacitor from starting winding to main winding or vice versa.
 reversing the terminals of starting winding.

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