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Electrical Machines

Electrical Machines
If the full load speed of 3-phase, 50Hz induction motor is 950 rpm, what is its half load speed nearly equals to?

 1000 rpm
 950 rpm
 975 rpm
 940 rpm

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Electrical Machines
In case of DC Shunt Motor, the speed will____ if the voltage increases, neglecting armature saturation.

 decrease.
 increase
 be unpredictable.
 remain the same.

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Electrical Machines
Open circuit test on transformer gives

 copper loss
 eddy current loss
 hysteresis loss
 both 1and 2

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Electrical Machines
For high current and low voltage rating which winding is employed to DC machine?

 Lap winding.
 Both wave and lap winding.
 No wave and lap winding.
 Wave winding.

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Electrical Machines
The stator frame in an induction motor is used to

  provide return path for the flux.
  hold armature stamping in position.
  protect the whole machine.
  ventilate the armature.

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Electrical Machines
The 3 - Φ induction motor with rotor circuit open will

  get over heated.
  run normally.
  not run.
  make noise.

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