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Electrical Machines

Electrical Machines
Armature reaction in dc motor results

  increase in speed.
  short circuit.
  open circuit.
  decrease in speed.

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Electrical Machines
When pure inductive load is connected to the alternator, what is the effect of armature reaction?

None of these
 Demagnetization
 Magnetization
 Cross magnetization

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Electrical Machines
Lamination of transformer core is made of

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

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

 Depends on other factor.
 Reduce by 5%.
 Remain unchanged.
  Increase by 5%.

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Electrical Machines
The wound rotor type IM is used for____________ speed operation.

  maximum.
  variable.
  minimum.
  constant.

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Electrical Machines
For small value armature current Ia the torque developed by a DC series motor is proportional to

  Ia2.
  Ia.
  √Ia.
  1/Ia.

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