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Electrical Machines

Electrical Machines
A delta/star transformer is connected in parallel to a star/delta transformer. The turn ratio former is x times latter, the x is

 √3
 3
 1/√3
 1/3

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Electrical Machines
Which of following DC motors will have percentage increase of input current for the same percentage increase in torque?

 Cummulative compound.
 Series.
 Differntical compound.
  Shunt.

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Electrical Machines
Hysteresis loss is proportional to

 f2.
 f1.5.
  f.
 f3.

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Electrical Machines
A 4 pole 50 Hz 1-phase induction motor is running at 1470 rpm. Find the forward and backward slips?

 0.02, 0.98
 0.04, 0.96
 0.04, 1.96
 0.02, 1.98

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Electrical Machines
The heat transfer by convection in a transformer least depends on

 air velocity.
 surface area.
  color of the paint.
 temperature difference.

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Electrical Machines
The stator core of a 3 - Φ induction motor is laminated in order to reduce the

  both of the above.
  hysteresis loss.
  eddy current loss.
  weight of the stator.

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