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Electrical Machines

Electrical Machines
The back emf produced in a dc motor depends on

  P and Z.
  Z.
  none of these.
  P.

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Electrical Machines
An electric motor with constant output power will have a torque speed characteristics in the form of a

 Rectangular hyperbola
 Straight line through the origin.
 Circle about the origin.
 Straight line parallel to the speed axis.

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

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

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Electrical Machines
What will be the eddy current loss if the supply frequency of a transformer becomes double?

 Eight times.
 Doubled.
 Four times.
 Remains same.

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Electrical Machines
When the rotor of a 3 phase induction motor is blocked then the slip is

 0.3.
  1.
 0.7.
  0.54.

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Electrical Machines
A 230 volt dc motor has an armature winding resistance of 0.5 ohm. Calculate the emf induced by the motor if the full load armature current is 23 ampere.

 220.4 volt.
  None of these.
  120 volt.
  218.5 volt.

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