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Electrical Machines

Electrical Machines
A 4 pole, 3-phase induction motor is running at 4% slip at full load. If the speed of the motor is 720 rpm, the supply frequency is

 40 HZ
 50 Hz
 60 Hz
 25 Hz

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

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

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Electrical Machines
The armature of a DC motor is laminated to reduce

 hysteresis loss.
 friction and windage loss.
 eddy current loss.
 copper loss.

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Electrical Machines
In DC generator, armature reaction refers to what?

 Effect of armature flux on the load.
None of these
 Effect of field flux on the armature flux.
  Effect of armature flux on the main field flux.

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Electrical Machines
Which of the following is/are not a self starting motor?

 3-phase induction motor
 1-phase induction motor
None of these
 both 1 and 2

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Electrical Machines
Induction motors provided with open slots have

  less breakdown torque.
  higher efficiency.
  more breakdown torque.
  leading power factor.

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