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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.
 6.
  8.
  2.

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Electrical Machines
In most condition which frame of motor will be preferred?

  Totally enclosed fan coiled.
 Open type.
 Drip proof.
 Splash proof.

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Electrical Machines
Which of the following is minimized by laminating the core of a transformer?

 Stray loss.
 Eddy current loss.
 Copper loss.
 Hysteresis loss.

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Electrical Machines
A shaded pole single phase induction motor can be used for

 food mixers
 tape recorders
 wet grinders
 personal computers as cooling fan

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Electrical Machines
For the same power output rating and full load speed, the motor will have poorest starting torque, is

 Cummulative compound.
  Shunt.
 Series.
 Differential compound.

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Electrical Machines
In DC machine, the armature windings are placed on the rotor because of necessity for

 generation of voltage.
 development of torque.
 commutation.
 electromechanical energy conversion.

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