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Electrical Machines

Electrical Machines
For the purpose of starting an induction motor, star/delta switch is an equivalent to auto transformer of ratio

 50%
 57.7%
 66.3%
 33.3%

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Electrical Machines
Addition of 0.3 % to 4.5 % silicon to iron

None of these
  increases the hysteresis loss.
  reduces the saturation magnetization.
  increases the electrical resistivity of iron.

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Electrical Machines
Flux density under leading pole tips in case of generator will

 increase
 either increase or decrease
 decrease
None of these

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Electrical Machines
Direct axis reactance is defined as the ratio of

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

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Electrical Machines
What is the frequency of rotor current of 50 Hz induction motor operating at 4% slip?

 50Hz
 2.5Hz
 1 Hz
 2HZ

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Electrical Machines
The 3 - Φ induction motor with rotor circuit open will

  run normally.
  get over heated.
  not run.
  make noise.

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