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Electrical Machines

Electrical Machines
Eb/V ratio of a DC motor is an indication of

 Speed regulation.
 Starting torque.
 Running Torque.
  Effiency.

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Electrical Machines
In a DC generator the emf generated by the armature is maximum when

 rate of change of flux is minimum.
  rate of change of flux is maximum.
 shaft rotation is high.
 induced voltage is high.

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Electrical Machines
Eb/Vt ratio of a DC motor is an indication of

 speed regulation.
 efficiency.
 starting torque.
 running torque.

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Electrical Machines
In salient pole synchronous machine, maximum power occurs at a load angle of

 90°
 less than 90°
 Greater than 90°
 0°

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Electrical Machines
Fufuraldehyde analysis is done to determine the

 condition of lamination on CRGO steel sheet.
 condition of oil in transformer.
 condition of cork gaskets used in transformer.
  condition of paper insulation in transformer.

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Electrical Machines
Field winding of a DC series motor is usually provided with thick wire

 as it carries large load current.
 to provide large flux.
 to reduce the insulation of materials.
 in order to reduce eddy current to provide large flux.

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