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Electrical Machines

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

 45 ppm.
 20 ppm.
 25 ppm.
  35 ppm.

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Electrical Machines
Open circuit in a transformer is prefered with

 rated transformer current
 high frequency supply
 direct current
 rated transformer voltage

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Electrical Machines
Hysteresis loss is proportional to

 f2.
 f1.5.
  f.
 f3.

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Electrical Machines
Stepper motor is used in

All of these
 computer printers
 food processing
 traction

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Electrical Machines
To have sparkless commutation, the armature reaction effect in a DC machine is neutralized by

  compensating winding and commutating poles.
 fixing the brush axis inline with the pole axis.
 increasing field excitation.
 shifting the brush axis from GNA to MNA.

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Electrical Machines
A 4-pole dc generator runs at 1500 rpm. The frequencyof current in the armature winding is

 0 Hz
 25 Hz
 100 Hz
 50 Hz

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MORE MCQ ON Electrical Machines

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