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Electrical Machines

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

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

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Electrical Machines
A 20KVA auto transformer, turn ratio is 0.8. Find the power transferred conductively?

 20KVA
 16KVA
 0KVA
 4KVA

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

  wound.
  linear.
  none of these.
  cage.

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Electrical Machines
In dc machines, the space waveform of the air-gap flux distribution affects

 both the torque and voltage
 neither the voltage nor the torque
 voltage but not the torque
 torque but not the voltage

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Electrical Machines
In case of DC shunt motor if load is reduced

 The speed will increase in proportion to reduction in load.
 The speed will increase abruptly.
 DC Shunt Motor
  The speed will remains almost constant.

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Electrical Machines
In DC generators brushes are used for

 reduce eddy current loss
 convert ac armature current in to dc
 collecting of voltage
 collecting of current without any sparkings

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