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Electrical Machines

Electrical Machines
The wattage rating of a ceiling fan motor will be

 200 - 250 W.
 10 - 20 W.
 250 - 500 W.
  50 - 150 W.

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Electrical Machines
which of the following type of brush and their application is/are correct

 carbon brush → normal ratings
 copper graphite → low voltage high current density
 electro graphite → large ratings
All of these

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Electrical Machines
A 400 V, 50 Hz, 30 Hp, three phase IM is drawing 50 A current at 0.8 p.f lagging. The stator and rotor copper losses are 1.5 KW and 900 W respectively. The friction and windage losses are 1050 W and core losses are 1200 W. The air gap power of the motor will be

 24.11 kW.
 23.06 kW.
 26.21 kW.
 25 kW.

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Electrical Machines
Tertiary winding in a transformer is mostly

 zig - zag delta connected.
 zig - zag star connected.
 star connected.
  delta connected.

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Electrical Machines
It is an advisable to use auto transformer if the transformation ratio is

 Greater than 1.
 0.25.
 0.5.
 near to 1.

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Electrical Machines
What type of dielectric material is used in capacitors used for fans and for power factor correction?

  Glass.
  Mica.
  Vacuum.
  Oil impregnated paper.

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