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Electrical Machines

Electrical Machines
The slot edges in a DC machine are made of

 Mild steel.
  Fibre.
 Silicon steel.
 Cast iron.

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Electrical Machines
If terminal voltage of one 1000 rpm shunt motor is reduced to half the speed of the motor will be

 250 rpm
 500 rpm
 1000 rpm
 2000 rpm

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Electrical Machines
A three phase 400 V, 6 pole, 50 Hz, squirrel cage induction motor is running at a slip of 5%. The speed of stator magnetic field with respect to rotor magnetic field and speed of rotor w.r.t stator magnetic field are

 1000 rpm, 950 rpm.
 1000 rpm, - 50 rpm.
 zero, 950 rpm.
 zero , - 50 rpm.

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Electrical Machines
DC generator will not build up voltage

 if field resistance is more than critical resistance.
 any one of above.
  if it has lost residual magnetism.
 due to wrong direction of rotation.

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

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

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Electrical Machines
Armature reaction of an unsaturated DC machine is

  crossmagnetising.
  none of above.
 demagnetising.
  magnetising.

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MORE MCQ ON Electrical Machines

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