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Electrical Machines

Electrical Machines
Open circuit test on transformer gives

 copper loss
 both 1and 2
 hysteresis loss
 eddy current loss

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Electrical Machines
The torque developed in IM is nearly proportional to

  V.
 1 / V2.
  V2.
  1 / V.

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Electrical Machines
The flux is maximum in the following part of a DC motor:

 pole core.
 under trailing pole tip.
 under the interpole.
 under leading pole tip.

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Electrical Machines
What does happen if tripled harmonics given to induction motor?

  Will results in short circuit.
  Nothing will happen.
  Fail to start.
  Will results in open circuit.

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Electrical Machines
A DC motor with armature resistance of 0.5 ohms connected directly to a 220 Volt supply. If the armature is stationary then the current flowing through the armature is

 440 A.
 340 A.
 570 A.
 250 A.

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Electrical Machines
Copper brushes in DC machine are used

None of these
 where low voltage and high currents are involved.
 in both of above cases.
 where high voltage and low current.

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MORE MCQ ON Electrical Machines

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