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Electrical Machines

Electrical Machines
The material used for commutator brushes is mostly

  carbon.
 mica.
 cast iron.
 copper.

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Electrical Machines
What is/are the necessary conditions for parallel operation of alternators?

 Speed of alternators should be same
 Both 1and 2
 Terminal voltage is same
 Frequency should be same

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Electrical Machines
In a DC generator, the ripples in the direct emf generated are reduced by employing

  equalizer rings.
 graphite brushes.
  commutator with large number of segments.
  carbon brushes.

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Electrical Machines
If the load current and the flux of a DC motor are held constant and voltage applied across its armature is increased by 5%, the speed of the motor will

 increase by 5 %.
 remain unchanged.
 depend on other factors.
 reduce by 5 %.

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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.

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

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Electrical Machines
If Kh is hysteresis constant, f is supply frequency, Bm maximum flux density in core of transformer, the expression of hysteresis loss in transformer, is given by

  KhfBm1.6.
 KhfBm3.
 KhfBm.
 Khf2Bm1.6.

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