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Electrical Machines

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

  variable.
  constant.
  maximum.
  minimum.

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Electrical Machines
In a lap winding dc machine number of conductors are 100 and number of parallel paths are 10. Find the average pitch

 50
 10
 100
 1

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Electrical Machines
Transformer cooling and insulating oil must be of

 low resistivity.
  low viscosity.
 low BDV.
 high viscosity.

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

 silicon steel.
 cast iron.
 fibre.
 mild steel.

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Electrical Machines
The direction of rotation of a 3 - Φ induction motor is clockwise when it is supplied with 3 - Φ sinusoidal voltage having phase sequence A - B - C. For counterclockwise rotation of motor, the phase sequence of the supply should be

  A - C - B.
 B - C - A.
 C - A - B.
 B - C - A or C - A - B.

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Electrical Machines
Which of the following is/are the methods to reduce the armature reaction and its effects?

All of these
 pole stacking
 pole chamfering
 compensating winding

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