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Electrical Machines

Electrical Machines
The maximum power developed in cylindrical synchronous machine is occurs at a load angle of

 90o.
 0o.
 Greater than 90o.
 less than 90o.

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Electrical Machines
Hysteresis loop represents the area of

 eddy current loss
 total iron losses
 copper loss
 hysteresis loss

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Electrical Machines
Generators work on the principle of production of

 dynamically induced emf.
 statically induced emf.
 dynamically and statically induced emf.
None of these

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Electrical Machines
As compared to an induction motor, the air gap in a DC motor is

 less than 50%.
 between 50% and 90%.
 same.
 more.

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Electrical Machines
Iron loss in a transformer mainly occurs in

 transformer insulating oil.
 iron made tank of transformer.
 winding of transformer.
 steel core in transformer.

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Electrical Machines
An electric motor with constant output power will have a torque speed characteristics in the form of a

 Straight line through the origin.
 Rectangular hyperbola
 Circle about the origin.
 Straight line parallel to the speed axis.

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