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Electrical Machines

Electrical Machines
If the applied voltage to a dc machine is 230 V, then the back emf, for maximum power developed, is

 115 V
 200 V
 460 V
 230 V

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Electrical Machines
Maximum allowable moisture content of power transformer insulating oil is generally taken as

 20 ppm.
 45 ppm.
  35 ppm.
 25 ppm.

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Electrical Machines
Use of fractional pitch winding

All of these
  results in reduced axial length of the machine.
  make it stiffer.
  results in reduced leakage reactance.

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Electrical Machines
Which of the following statement is correct, if short circuit ratio is high?

 High voltage regulation
None of these
 Low short circuit current
 Good voltage regulation

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Electrical Machines
Synchronising power of a synchronous motor varies

 inversely as 1/Xs
 directly as Xs2
All of these
 directly as synchronous reactances Xs

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Electrical Machines
To control the speed of an induction motor, the supply frequency is reduced by 10%. For the same magnetizing current to remain constant, the supply voltage must be

 reduced by 20%
 increased by 20%
 increased by 10%
 reduced by 10%

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