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Electrical Machines

Electrical Machines
Open circuit test on transformer gives

 eddy current loss
 hysteresis loss
 both 1and 2
 copper loss

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Electrical Machines
A 4-pole generator with 16 coil has a two layer lap winding. The pole pitch is

 16.
 32.
  4.
 8.

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Electrical Machines
What is the emf generated by a 4 pole Lap connected DC Motor rotating at 1500 rpm having 1000 conductors and useful flux per pole is 0.4 mWb.

 40 volts.
 30 volts.
 20 volts.
 10 volts.

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Electrical Machines
In case of induction motors the ratio of length to pole pitch for minimum cost, is taken as

 1.0.
 3 to 5.
 2 to 3.
  1.5 to 2.

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Electrical Machines
Synchronising power of a synchronous motor varies

All of these
 directly as Xs2
 directly as synchronous reactances Xs
 inversely as 1/Xs

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Electrical Machines
Silicon content in steel lamination is kept within 5% as it

 increases hysteresis loss.
 makes the material brittle.
All of these
 Increases cost.

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MORE MCQ ON Electrical Machines

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