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Electrical Machines

Electrical Machines
A generator may loose residual magnetism due to

  over excitation.
  heating.
  vibrations.
  any of these.

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Electrical Machines
Eddy current loss will depends on

 Flux density
 Frequency
 Thickness
All of these

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Electrical Machines
In which of the following, voltage regulation may be zero or negative

 lagging power factor
 unity power factor
All of these
 leading power factor

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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

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

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Electrical Machines
The basic function of a transformer is to change

 the level of the voltage
 the power factor
 the power level
 the frequency

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Electrical Machines
The fall in speed of the DC generator due to increase in load can be corrected by

  increasing the excitation.
  reducing the load voltage.
  increasing the input to the prime mover.
 cooling the armature.

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