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Electrical Machines

Electrical Machines
A transformer has hysteresis loss of 30 W, at 240 V, 60 Hz. The hysteresis loss at 200 V, 50 Hz will be

 30 W.
 28 W.
 25 W.
 36 W.

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Electrical Machines
The use of higher flux density in the transformer design

 has no relation with the weight of transformer
 reduces the weigh per KVA
 increases the weigh per KVA
None of these

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Electrical Machines
For which of the following loads, armature reaction is magnetizing in nature?

 pure capacitive load
None of these
 pure resistive load
 pure inductive load

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Electrical Machines
Induction motors provided with open slots have

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

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Electrical Machines
The brushes of a DC machine should be placed on the

 commutator in the inter polar axis.
 armature in the polar axis.
 commutator in the polar axis.
 armature midway between poles.

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Electrical Machines
The principle of dynamically induced emf is utilized in

 thermocouple.
 choke.
 generator.
 transformer.

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