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Electrical Machines

Electrical Machines
Hysteresis loop represents the area of

 hysteresis loss
 copper loss
 eddy current loss
 total iron losses

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Electrical Machines
A 3-phase, 50 Hz, 4 pole induction motor is running at 1440 rpm. Find the rotor efficiency?

 94%
 95%
 92%
 96%

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Electrical Machines
In a transformer which of the following losses are zero?

 Rotational loss
All of these
 Copper loss
 Iron loss

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Electrical Machines
It is an advisable to use auto transformer if the transformation ratio is

 near to 1.
 0.25.
 Greater than 1.
 0.5.

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Electrical Machines
The emf induced in a conductor rotating in a bipolar field is

 AC.
None of these
 both of above.
 DC.

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Electrical Machines
Hysteresis loss will depends on

 f
 f1.6
 f²
 f³

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