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Electrical Machines

Electrical Machines
Hysteresis loss will depends on

 f³
 f
 f1.6
 f²

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Electrical Machines
Exciting current of an induction motor is

  equal as power transformer.
  higher than power transformer.
  none of these.
  lesser than power transformer.

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Electrical Machines
Direction of rotation of DC motor is reversed by

 Reversing supply connection.
 Adding resistance to field circuit.
 Reversing armature connection or field connection.
 Interchanging armature and field connection.

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Electrical Machines
A DC 4 pole lap wound generator is running at 1000 rpm having 1200 conductors and flux density is 10 mwb. find the generated emf?

 200V
 100V
 10V
 20V

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Electrical Machines
In star-delta starting of squirrel cage induction motor compared to DOL starting the starting current and torque are

 1/3, 1/√3
 1/3, 1/3
 1/√3, 1/√3
 1/√3, 1/3

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Electrical Machines
In a dc machine 72 number of coils are used. Find the number of commutator segments required?

 36
 72
 74
 37

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