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Electrical Machines

Electrical Machines
If a DC Series motor is connected across an AC supply it will

 burn.
 run at normal speed.
 run at lower speed.
 not run.

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Electrical Machines
Which of the following relation is correct?

 Xd < Xq.
None of these
 Xd > Xq.
 Xd = Xq.

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Electrical Machines
In DC machine torque is proportional to which of the following?

 armature current(Ia)
None of these
 flux(φ)
 both A and B

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Electrical Machines
DC generator will not build up voltage

 if field resistance is more than critical resistance.
 due to wrong direction of rotation.
 any one of above.
  if it has lost residual magnetism.

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Electrical Machines
The shaft of induction motor may be unbalanced due to

  poor lubrication.
  overload.
  uneven air gap.
  overheating of winding.

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Electrical Machines
If starter is not used with large DC motor for starting, it will

 draw a starting current many times its rated full load current.
 damage the armature and commutator.
 all of above.
 provide execessive voltage drop in line.

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MORE MCQ ON Electrical Machines

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