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Electrical Machines

Electrical Machines
The speed of rotating magnetic field of 8 pole 50 Hz induction motor is

 1000 rpm
 3000 rpm
 750 rpm
 1500 rpm

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Electrical Machines
In a three phase star - delta transformer, what is the angle difference between primary and secondary phase voltages?

 Delta side leads by 30°.
 Star side leads by 30°.
 Star side lags by -30°.
  Delta side lags by -30°.

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Electrical Machines
In induction motors, there is large decrease in maximum power factor when the dispersion coefficient is ________________.

 remains same.
 decreased.
 kept constant to certain value.
  increased.

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Electrical Machines
For high current and low voltage rating which winding is employed to DC machine?

 Wave winding.
 Both wave and lap winding.
 No wave and lap winding.
 Lap winding.

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Electrical Machines
A load of 900 lbs is to be raised with a lift car weighting 855 lbs at a speed of 110 feet per minute, the over balance being 40 % and percentage efficiency 45 %. Find the horse power of the motor without counterweight

 180.
  150.
 160.
 170.

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Electrical Machines
At the instant of starting, the per unit slip of 3 - Φ induction motor is

  0.5.
  0.1.
  0.05.
  1.0.

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