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Electrical Machines

Electrical Machines
When maximum starting torque is obtained, rotor power is

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Electrical Machines
Minimum allowable resistivity of power transformer insulating oil is generally taken as

  1 X 1012 Ω - cm at 27°C and 0.1 X 1012
 2 X 1012 Ω - cm at 27°C and 0.2 X 1012
 4 X 1012 Ω - cm at 27°C and 0.4 X 1012
 3 X 1012 Ω - cm at 27°C and 0.3 X 1012

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Electrical Machines
A 4-pole generator with 16 coil has a two layer lap winding. The pole pitch is

 32.
 8.
 16.
  4.

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Electrical Machines
A short circuit test on a transformer gives

 copper loss at full load.
 copper loss at over load.
 copper loss at half load.
  copper loss at any load.

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Electrical Machines
The sparking at the the brushes, in a DC machines is due to

 presence of commutator.
  reactance voltage.
 high resistance of carbon brushes.
 armature reaction.

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Electrical Machines
In DC generator, lap winding is used in

 where constant speed is required.
 high voltage and low current applications.
  high current and low voltage applications.
 where greater load is connected.

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