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Electrical Machines

Electrical Machines
In alternator, the rotary part is

 core.
 none of these.
 armature.
  magnetic field poles.

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Electrical Machines
Which of the following methods of speed control is not affected through stator side?

  Change of rotor resistance.
  Change of supply voltage.
  Change of number of pole.
  Change of supply frequency.

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Electrical Machines
A 4 pole wave wound dc motor having flux per pole of 9.56 X 10-3 Wb contains 460 armature conductors. Calculate the back emf produced when it is running at a speed of 1500 rpm.

 240 volt.
 230 volt.
  220 volt.
 440 volt.

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Electrical Machines
Thin laminations are used in a machine in order to reduce

 Copper losses
 Both 1 and 2
 Eddy current losses
 Hysteresis losses

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Electrical Machines
Lamination of transformer core is made of

  silicon steel.
 cast steel.
 wrought iron.
  cast iron.

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Electrical Machines
Voltage regulation can be determined by which of the following?

 Synchronous impedance method.
All of these
 ZPF method.
 MMf method.

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MORE MCQ ON Electrical Machines

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