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Electrical Machines

Electrical Machines
The speed of stator rotating magnetic field (RMF) with respect to rotor is

 S.Ns
 Zero
 Nr
 Ns

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Electrical Machines
Which method is less recommendable for induction motor starting in the industries?

  Stator resistance starting.
  Direct online starting.
  Rotor resistance starting.
  Auto transformer starting.

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Electrical Machines
In a DC generator the actual flux distribution depends upon

 size of air gap.
  all of above.
  clearance between tips of the adjacent pole shoes.
  shape of the pole shoe.

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Electrical Machines
The effect of ------------------ on main field flux is armature reaction?

 armature flux
All of these
 armature mmf
 armature current

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Electrical Machines
When operating, two or more transformers in parallel, % impedance of these transformers should be

 proportionate to MVA rating of transformers.
  same.
 such that actual impedance of all transformers would be same.
 inversely proportional to MVA rating of transformers.

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Electrical Machines
The condition for maximum running torque is

 unity
 0.707 lagging
 R = S.X
 zero
 0.5 lagging

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MORE MCQ ON Electrical Machines

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