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Electrical Machines

Electrical Machines
Open circuit test on transformer gives

 both 1and 2
 eddy current loss
 hysteresis loss
 copper loss

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Electrical Machines
A slip ring Induction motor runs at 290 rpm at full load, when connected to 50 Hz supply. Determine the number of poles and slip.

  P = 40, s = 5.79 %.
  P = 50, s = 4.43 %.
  P = 20, s = 3.33 %.
  P = 60, s = 0.96 %.

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Electrical Machines
To get the speed of DC motor more than normal without wastage of electrical energy _____________ is used.

 Ward Leonard control.
 none of above.
 rheostatic control.
 any of above method.

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Electrical Machines
A triangular mmf wave is produced in the air gap of an electric machine. Such wave is produced by

 rotor of a dc machine.
 rotor of an synchronous machine.
 stator of a dc machine.
 stator of a induction machine.

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Electrical Machines
In a single phase induction motor driving a fan load, the reason for having a high resistance rotor is to achieve

 low starting torque.
 high efficiency.
 reduced size.
  quick acceleration.

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Electrical Machines
Armature reaction in dc motor results

  increase in speed.
  open circuit.
  short circuit.
  decrease in speed.

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MORE MCQ ON Electrical Machines

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