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Electrical Machines

Electrical Machines
If peak value of phase mmf is F max , then peak value of the rotating field caused by three phase is

 3Fmax.
  (3/2)Fmax.
 Fmax.
 (1/2)Fmax.

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Electrical Machines
A DC generator beyond critical resistance will generate

 no voltage.
 maximum voltage.
 maximum current.
 maximum power.

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Electrical Machines
If Kh is hysteresis constant, f is supply frequency, Bm maximum flux density in core of transformer, the expression of hysteresis loss in transformer, is given by

  KhfBm1.6.
 KhfBm3.
 Khf2Bm1.6.
 KhfBm.

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Electrical Machines
In shapers and slotters which motor are preferred?

  Synchronous motor.
  Squirrel cage IM.
  Double cage motor.
  Slip ring IM.

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Electrical Machines
A 4-pole generator with 16 coil has a two layer lap winding. The pole pitch is

 16.
  4.
 8.
 32.

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Electrical Machines
Equalizer rings are used in which of the followings?

None of these
 lap winding
 wave winding
 both 1 and 2

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