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Electrical Machines

Electrical Machines
In salient pole synchronous machine, the reluctance power varies as

 sin2δ
 cos2δ
 sinδ
 cosδ

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Electrical Machines
What is the effect of armature reaction ?

 Armature flux weakens the main field flux.
  Both option B and C.
 None of the options.
 Armature flux distorts the main field flux.

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Electrical Machines
stepped cores are used in transformers in order to reduce

 volume of copper.
 reluctance of core.
 iron loss.
 volume of iron.

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Electrical Machines
If the excitation is increased, the power factor is

None of these
 leading power factor
 lagging power factor
 unity power factor

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Electrical Machines
In a transformer the magnetic coupling between the primary and secondary winding can be increased by

 using transformer oil of better quality.
 using the magnetic core of low reluctance.
 increasing the number of turns.
 using soft material for winding.

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Electrical Machines
In case of a dc motor the ratio Eb / E is indicative of

  efficiency.
  ratio of starting to running torque.
  ratio of starting to running current.
  ratio of input to output voltage.

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MORE MCQ ON Electrical Machines

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