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Electrical Machines

Electrical Machines
A 4 pole 50 Hz induction motor is running at 1470 rpm. The frequency of rotor current is

 0 Hz
 1 Hz
 5 Hz
 50 Hz

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

 sin2δ
 sinδ
 cos2δ
 cosδ

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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
Hysteresis loop represents the area of

 hysteresis loss
 copper loss
 total iron losses
 eddy current loss

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Electrical Machines
The output power indicated on the name plate of any motor is always the

 Gross power.
 Power drawn in KW.
 Output power at the shaft.
 Power drawn in KVA.

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Electrical Machines
Which of the following windings are necessary in case of all dc machines?

 lap winding
 open type winding
 wave winding
 closed winding

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MORE MCQ ON Electrical Machines

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