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Electrical Machines

Electrical Machines
Oil is provided in an oil filled transformer for

  both cooling and insulation.
 lubrication.
 cooling.
  insulating.

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Electrical Machines
Which of the following DC motors has got maximum relieving property?

 Differentical compound.
 Shunt.
  Series.
 Cummulative compound.

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Electrical Machines
In DC machine shape of armature MMF wave is?

 Saddle shape.
 Triangular and directed towards brush axis.
 Triangular and directed towards main pole.
 Peaky in nature.

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Electrical Machines
DC Shunt Motor has disadvantage(s) of

 less expensive.
 not suitable for rapidly changing loads.
 constant speed.
 none of above.

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Electrical Machines
Stepper motor is used in

 food processing
All of these
 computer printers
 traction

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Electrical Machines
Tappings of a transformer are provided

 at the middle of hv side
 at the phase end of lv side
 at the phase end of hv side
 at the neutral side end of hv side

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