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Electrical Machines

Electrical Machines
The current drawn by a 220 V DC series motor of armature resistance 0.5 Ω and back emf of 200 V is

 440 A.
 40 A.
 400 A.
 44 A.

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Electrical Machines
Fufuraldehyde analysis is done to determine the

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

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Electrical Machines
The armature of a DC motor is laminated to reduce

 copper loss.
 friction and windage loss.
 hysteresis loss.
 eddy current loss.

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Electrical Machines
In induction motors, there is large decrease in maximum power factor when the dispersion coefficient is ________________.

  increased.
 remains same.
 decreased.
 kept constant to certain value.

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Electrical Machines
Which of the following induction motor has maximum speed?

 4 pole.
 8 pole.
  2 pole.
 6 pole.

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Electrical Machines
The DC compound motors are generally

 None of these.
 Level Compound.
 Cummulative compound.
 Differentical compound.

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