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Electrical Machines

Electrical Machines
In a transformer maximum flux density is not constant, the eddy current loss varies as

 V
 V²
 f
 f²

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Electrical Machines
Two windings provided on the stator of 1-phase induction motor, one main winding and the other auxiliary winding are connected

 in series
 through inductive coupling
 either of these depending on the design of the motor
 in parallel

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Electrical Machines
The dc motor which can provide zero speed regulation at full load without any controller, is

 shunt.
 cumulative compound.
 differential compound.
 series.

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Electrical Machines
The wattage rating of a ceiling fan motor will be

 10 - 20 W.
  50 - 150 W.
 200 - 250 W.
 250 - 500 W.

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

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

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Electrical Machines
The speed of a cumulatively compound DC motor can be controlled by varying

 Shunt field resistance control.
 Any of above.
 Armature resistance control.
 Armature voltage control.

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