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Electrical Machines

Electrical Machines
The output power of a dc motor is given by

  EbIa2.
  EIa.
  EbIa.
  none of these.

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Electrical Machines
Direction of rotation of DC motor is reversed by

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

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Electrical Machines
A triangular mmf wave is produced in the air gap of an electric machine. Such wave is produced by

 stator of a induction machine.
 rotor of an synchronous machine.
 stator of a dc machine.
 rotor of a dc machine.

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Electrical Machines
The flux involved in the emf equation of a transformer has

 total value.
  maximum value.
 average value.
 rms value.

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Electrical Machines
Sparkless commutation can be achieved by employing

  inter poles.
  high resistance carbon brushes.
 compensating winding.
  any one or more of the above methods.

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Electrical Machines
What is the shunt resistance component equivalent circuit obtained by no load test of an induction motor representative of ?

 Copper loss
 windage and friction loss
 core loss only
 both 1 and 2

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