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Electrical Machines

Electrical Machines
Dynamic braking is employed to brake

 non reversing drive
 both 1 and 2
 reversing drive
None of these

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Electrical Machines
Saving of copper in auto transformer is increased as compared to two winding transformer, when transformation ratio K approaches to

 two.
  unity.
 zero.
 infinity.

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Electrical Machines
In an induction motor, the no-load slip is generally equal to

  less than 1 %.
  zero.
 4 %.
 1.5 %.

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

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

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Electrical Machines
The type of DC motor used for shears and punches is

 Series motor.
 Shunt motor.
 Differential compound motor.
  Cummulative compound motor.

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Electrical Machines
If Ke is eddy current constant, Kf is form factor, f is supply frequency, Bm maximum flux density in core of transformer, the expression of eddy current loss in transformer, is given by

 Kef2KfBm2.
 Kef2Kf2Bm.
 KefKf2Bm2.
  Kef2Kf2Bm2.

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