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Electrical Machines

Electrical Machines
DC machine windings are

 full pitched
 short pitched
 either of these
None of these

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Electrical Machines
When two DC series motors are connected in parallel, the resultant speed is

 more than normal speed.
 zero.
 normal speed.
 less than normal speed.

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Electrical Machines
The direction of rotation of conductor of a DC motor can be determined by

 Fleming's right hand rule.
 Fleming's left hand rule.
 Lenz's law.
 Ampere law.

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Electrical Machines
In a dc machine, the demagnetizing effect of armature reaction is due to

 magnetic saturation in half of the field pole
 component of armature mmf along field axis
 non-sinusoidal nature of armature mmf
 uneven air-gap length

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

 decrease.
 remain the same.
 increase
 be unpredictable.

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

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MORE MCQ ON Electrical Machines

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