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Electrical Machines

Electrical Machines
Maximum efficiency will occur, when copper loss is_______to iron loss?

 greater than
 less than
 any of the above
 equal to

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Electrical Machines
In a DC Shunt Motor the speed can be increased by

 Increasing the field current.
 Increasing the armature current.
 Increasing the field current.
 Decreasing the field current.

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Electrical Machines
Width of a carbon brush should be equal to

 less than the width of commutator segment.
 the width of the 2 to 3 commutator segment.
 the width of the 1 to 2 commutator segment.
 the width more than 3 commutator segment.

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

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

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Electrical Machines
Select the motor that should not be started on no load?

 Brushless DC motor.
 Shunt motor.
  Series motor.
 Compound motor.

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Electrical Machines
Swinburne's test is applicable to

 DC series motor.
 DC Shunt motor.
 DC compound motor.
 DC shunt and level Compound motor.

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