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Electrical Machines

Electrical Machines
In a dc machine 6 pole wave winding is used. The number of parallel paths are?

 1
 6
 2
 4

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Electrical Machines
For high current and low voltage rating which winding is employed to DC machine?

 Wave winding.
 Lap winding.
 Both wave and lap winding.
 No wave and lap winding.

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Electrical Machines
To get the speed of DC motor is more than normal without wastage of electrical energy _____________ is used.

  Any of above method.
  None of above.
  Rheostatic control.
  Ward Leonard control.

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Electrical Machines
In V/f speed control of 3-phase induction motor, with increase in frequency, the slip at which maximum torque occurs

 increase.
None of these
 either of these.
 decrease.

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Electrical Machines
A triangular mmf wave is produced in the air gap of an electric machine. Such wave is produced by

 rotor of an synchronous machine.
 stator of a dc machine.
 rotor of a dc machine.
 stator of a induction machine.

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Electrical Machines
Which of the following is/are effects of armature reaction?

 increase the maintenance and repair
 increases the design cost
All of these
 increase the iron loss

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