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Electrical Machines

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

 less than
 any of the above
 equal to
 greater than

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Electrical Machines
What are slot wedges in a DC machine made of?

 Fibre.
 Mild steel.
 Silicon steel.
 Cast iron.

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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 ?

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

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Electrical Machines
Regenerative braking is not found in which motor?

  DC series.
 Induction motor.
 DC compound.
 DC shunt.

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Electrical Machines
In dc machine armature windings are placed on rotor because of the necessity for

 commutation.
 electromechanical energy conversion.
 development of torque.
 generation of voltage.

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Electrical Machines
Secondary winding of an auto transformer is also called

  common winding.
 tertiary winding.
 compensating winding.
 damping winding.

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