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Electrical Machines

Electrical Machines
Oil is provided in an oil filled transformer for

  both cooling and insulation.
 cooling.
 lubrication.
  insulating.

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

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

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Electrical Machines
In a DC generator if field winding attains the critical resistance

 field winding will burn.
 the voltage generated will be zero.
 machine will generate maximum voltage.
 machine will generate maximum power.

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

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

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Electrical Machines
The output power of a dc motor is given by

  none of these.
  EIa.
  EbIa2.
  EbIa.

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Electrical Machines
The no load and full load speed of DC mototr are 1400 rpm and 1200 rpm respectively. What is the percentage speed regulation of the motor?

 14.28%.
  16.67%.
 15.30%.
 18.25%.

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