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Electrical Machines

Electrical Machines
The speed of stator rotating magnetic field (RMF) with respect to rotor is

 S.Ns
 Zero
 Ns
 Nr

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

 be unpredictable.
 increase
 remain the same.
 decrease.

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Electrical Machines
Which of following DC generator will be in a position to build up without any residual magnetism in the field?

  Series.
  Compound.
 Shunt.
  Separately excited.

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Electrical Machines
In synchronous generator V curve is drawn between

 field current on X-axis and power factor on Y-axis.
 either of these.
 field current on X-axis and armature current on Y-axis.
 field current on Y-axis and armature current on X-axis.

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Electrical Machines
Which of the following represents the pitch factor?

 Cos α
 sin (α/2)
 Cos α²
 Cos (α/2)

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Electrical Machines
The direction of rotation of a DC compound motor can be reversed by interchanging

 shunt field connections.
 armature or field connections.
 series field connections.
 armature connections.

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MORE MCQ ON Electrical Machines

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