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Electrical Machines

Electrical Machines
Slot wedges in a dc machine is made up of

 silicon steel.
 mild steel.
 cast iron.
 fibre.

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Electrical Machines
In DC generator, brushes are always placed along

 armature axis.
 geometrical neutral axis.
  magnetic neutral axis.
 load axis.

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Electrical Machines
With the increases in field excitation of a DC generator, its generated emf

  remains constant.
  increases upto a limit and then remains almost constant.
  decreases.
 increases.

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Electrical Machines
The armature of DC machine is made of silicon steel lamination to

 reduce both eddy current and hysteresis loss.
 increase the permeability.
 reduce hysteresis loss only.
 reduce eddy current loss only.

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Electrical Machines
Induction motors normally use cast aluminium rotor because aluminium is

  lighter in weight.
  cheaper in cost.
  easy to cast owing to its low melting point and is easily available.
  of low resistivity.

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Electrical Machines
The type of DC motor generally used for shears and punches is

 Differential compound motor.
 Cummulative compound motor.
 Shunt motor.
 Series motor.

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MORE MCQ ON Electrical Machines

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