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Electrical Machines

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

  4.
 8.
 32.
 16.

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Electrical Machines
Which of the following machines have highest power factor with respect to magnetizing current?

 Closed slot type machines.
 Any of the above.
 Semi closed slot type machine.
 Open slot type machines.

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Electrical Machines
With the increases in field excitation of a DC generator, its generated emf

 increases.
  remains constant.
  increases upto a limit and then remains almost constant.
  decreases.

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Electrical Machines
In dc machines, the armature windings are placed on the rotor because of the necessity for

 electromechanical energy conversion
 generation of voltage
 development of torque
 commutation

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Electrical Machines
The dc motor which can provide zero speed regulation at full load without any controller, is

 differential compound.
 shunt.
 series.
 cumulative compound.

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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

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

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