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Electrical Machines

Electrical Machines
Induction motors have the advantage of

  simple in construction.
  less maintenance.
  less cost.
  all of below.

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Electrical Machines
Why are capacitors used with large AC induction motor?

  Improve power level.
  Improve voltage level.
  Improve current level.
  Improve power factor.

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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

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

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Electrical Machines
A DC compound motor has

 tertiary winding.
 both shunt and series field winding.
 only series field winding.
 only shunt field winding.

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Electrical Machines
An induction motor is, in general analogous to

None of these
 two winding transformer with secondary short circuited.
 auto transformer.
 two winding transformer with secondary open circuited.

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Electrical Machines
In DC generator, full form of MNA is what?

  Magnetic neutral axis.
 Magnetic neutral armature co-ordinate.
 Magnetic no-load axis.
 Magnetically no-load armature co-ordinate.

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