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Electrical Machines

Electrical Machines
Transformer core is laminated to reduce

 copper loss.
 hysteresis loss.
 eddy current loss.
 both 1 and 2.

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Electrical Machines
Hunting phenomenon is observed in which motor?

 Induction motor.
  Synchronous motor.
 Both A and C.
 DC motor.

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Electrical Machines
If the handle of a three point starter goes to back to OFF position, it may be due to

 over load.
 zero or very low voltage supply.
 high filed circuit resistance.
 all of these.

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

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

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Electrical Machines
The shaft of induction motor should be

  flexible.
  any of these.
  hollow.
  stiff.

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Electrical Machines
Poles of DC machine are often laminated to

 dissipate more heat.
 reduce pulsation loss.
 reduce armature reaction.
 reduce iron weight.

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MORE MCQ ON Electrical Machines

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