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Electrical Machines

Electrical Machines
A 3-phase 6 pole 50 Hz induction motor is running at 5% slip.What is the speed of the motor?

 1000 rpm
 900 rpm
 850 rpm
 950 rpm

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Electrical Machines
Eg (generated emf) and Eb (back emf) both are

 different.
 changes.
 none of above.
 same.

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Electrical Machines
Direction of the current in the compensating winding is________ to the direction of current in the armature conductors?

 either of these
None of these
 same
 exactly opposite

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Electrical Machines
A generator may loose residual magnetism due to

  over excitation.
  any of these.
  vibrations.
  heating.

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Electrical Machines
Series generators are used in which of the following applications?

 Arc welding.
 Used as boosters in dc distribution or transmission.
 Air crafts.
All of these

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Electrical Machines
No load test on induction motor is conducted to find which of the following losses?

 Stator core loss
 Rotational loss
 Stator copper loss
All of these

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