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Electrical Machines

Electrical Machines
Direct axis reactance is defined as the ratio of

 Vmin to Imax
 Vmax to Imin
 Vmin to Imin
 Vmax to Imax

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Electrical Machines
In which transformer, the tertiary winding is used?

 Delta - star
 Delta - delta
 Star - delta
 Star - star

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Electrical Machines
If the number of rotor slots is equal to number of stator slots, then motor refuses to start. Hence it is known as

  relative speed.
  crawling.
  air gap.
  cogging.

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Electrical Machines
Maximum allowable acidity level of power transformer insulating oil is generally taken as

  0.3 mg of KOH / gm.
 2 mg of KOH / gm.
 0.5 mg of KOH / gm.
  1 mg of KOH / gm.

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Electrical Machines
Use of fractional pitch winding

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

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Electrical Machines
Under operating conditions the rotor conductor should be _________________ in induction motor.

  none.
  always opened.
  always closed.
  semi closed or semi opened.

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