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Electrical Machines

Electrical Machines
The speed of a 50 Hz three phase induction motor under full load condition is 725 rpm the number of poles of the motor are ______________.

 4.
  8.
  2.
 6.

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Electrical Machines
Tap changer is generally provided in

 voltage transformer.
 earthing transformer.
 current transformer.
  power transformer.

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Electrical Machines
The rotor of a 3 - Φ wound induction motor is provided with

  heavy short-circuited end rings.
  heavy copper or aluminium bars placed in rotor slots.
  three phase winding.
  single phase winding.

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Electrical Machines
In a transformer, the frequency of a voltage at the secondary is

 equal to primary.
 any of the above.
 less than primary.
 greater than the primary.

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Electrical Machines
Which of the following statements is/are correct ?

 Inter pole winding will act in interpolar region.
None of these
 Compensating winding will act under the pole.
 Both A and B.

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Electrical Machines
A 230 V dc series generator is driven at its rated speed. The no-load voltage across its armature terminals would be

 somewhat more than 230 V
 somewhat less than 230 V
 6 V
 230 V

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