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Electrical Machines

Electrical Machines
Flux density under trailing pole tips in case of generator will

None of these
 either increase or decrease
 increase
 decrease

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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 ?

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

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Electrical Machines
A dc shunt motor has external resistance Ra and Rf in the armature and field circuits respectively. Armature current at starting can be reduced by keeping

 Ra minimum and Rf minimum
 Ra maximum and Rf maximum
 Ra maximum and Rf minimum
 Rf maximum and Ra minimum

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Electrical Machines
A 230 volt dc motor has an armature winding resistance of 0.5 ohm. Calculate the emf induced by the motor if the full load armature current is 23 ampere.

  120 volt.
  None of these.
  218.5 volt.
 220.4 volt.

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Electrical Machines
Armature resistance control method is used for the _______ ?

None of these
 both 1 and 2
 above rated speed
 below rated speed

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Electrical Machines
The efficiency of a transformer is mainly dependent on

 core losses.
 copper losses.
 stray losses.
 dielectric losses.

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