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Electrical Machines

Electrical Machines
Maximum allowable moisture content of power transformer insulating oil is generally taken as

  35 ppm.
 45 ppm.
 20 ppm.
 25 ppm.

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Electrical Machines
Field weakening control method is used for the _________ ?

None of these
 below rated speed
 above rated speed
 both A and B

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Electrical Machines
For the same power output rating and full load speed, the motor will have poorest starting torque, is

 Differential compound.
  Shunt.
 Cummulative compound.
 Series.

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Electrical Machines
An induction motor has synchronous speed of 1500 rpm. What will be the slip when it is running at a speed of 1450 rpm?

 +3%
 +3.33%
 -3.33%
 -3%

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Electrical Machines
Drop in speed from no load to full load is very high in

 Shunt motor with interpoles.
 Cummulative compound motor with interpoles.
 Series motor with interpoles.
  Series motor without interpoles.

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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?

 Series.
  Shunt.
 Cummulative compound.
 Differntical compound.

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MORE MCQ ON Electrical Machines

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