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Electrical Machines

Electrical Machines
For pure resistive load what is the armature reaction?

All of these
 demagnetization
 cross magnetization
 magnetization

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Electrical Machines
With the increases in field excitation of a DC generator, its generated emf

 increases.
  decreases.
  increases upto a limit and then remains almost constant.
  remains constant.

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Electrical Machines
In which transformer, the tertiary winding is used?

 Delta - delta
 Star - star
 Delta - star
 Star - delta

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Electrical Machines
In DC machines internal characteristics are plotted between

 Eg vs load current
 Eg vs Ia
 Vt vs load current
 Vt vs Ia

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Electrical Machines
If the field connection of a DC Shunt Motor is changed then

 it will run in same direction.
 it will run in same direction by slowly.
 it will run in opposite direction.
 motor will not run.

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Electrical Machines
In a resistance split phase motor, what is the range of torque angle?

 90°
 0°
 70° to 85°
 25° to 30°

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