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Electrical Machines

Electrical Machines
Find the number of poles required, when the frequency is 50Hz and speed of the motor is 500 rpm?

 12
 10
 5
 24

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

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

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Electrical Machines
The rotor slots are slightly skewed in squirrel cage induction motor to

 decrease the amount of copper to be used.
 reduce the magnetic hum and locking tendency of rotor.
 increase the strength of rotor bars.
 provide ease of fabrication.

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Electrical Machines
A separately-excited dc motor has an armature resistance of 0.5 Ω. It runs off a 250 V dc supply Drawing an armature current of 20 A at 1500 rpm. The torque developed for an armature current Of 10 A, for the same field current, will be

 16.55 Nm
 15.28 Nm
 15.92 Nm
 15.6 Nm

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Electrical Machines
Speed of DC motor can be controlled by varying

 applied voltage.
 its flux oer pole.
 resistance of armature culture.
 all of these.

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Electrical Machines
Crawling in an induction motor is due to

  space harmonics produced by winding currents.
  insufficient starting torque.
  time harmonics in supply.
  slip ring rotor.

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