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Electrical Machines

Electrical Machines
Hysteresis loss will depends on

 f²
 f³
 f
 f1.6

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Electrical Machines
For satisfactory performance of 3-phase 480V, 60 Hz induction motor, the supply voltage at 50 Hz should be equal to

 420 V.
 400 V.
 480 V.
 350 V.

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Electrical Machines
In dc machine armature windings are placed on rotor because of the necessity for

 generation of voltage.
 commutation.
 electromechanical energy conversion.
 development of torque.

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Electrical Machines
In synchronous motor, the damper winding is generally used to

  reduce the eddy currents.
  provide starting torque only.
  prevent hunting and provide the starting torque.
  reduce noise level only.

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Electrical Machines
In an alternator the voltage generated per phase is proportional to

  frequency of waveform.
All of these
  flux per pole.
  number of turns in coil.

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Electrical Machines
To increase starting torque of a 3-phase slip ring induction motor, preferred method is to increase

None of these
 rotor resistance
 supply frequency
 supply voltage

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MORE MCQ ON Electrical Machines

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