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Electrical Machines

Electrical Machines
A commutator with a diameter of 50 cm rotating at 1000 rpm. For a brush width of 1.5 cm, find the time of commutation in ms.

 0.649.
 0.443.
 0.512.
  0.573.

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Electrical Machines
The heat transfer by convection in a transformer least depends on

 surface area.
 air velocity.
 temperature difference.
  color of the paint.

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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

 15.28 Nm
 15.92 Nm
 16.55 Nm
 15.6 Nm

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Electrical Machines
Universal motor have which of the following application?

  Food mixer.
  Domestic pump.
  Traction.
  Lift.

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Electrical Machines
In dc machines, the armature windings are placed on the rotor because of the necessity for

 commutation
 generation of voltage
 electromechanical energy conversion
 development of torque

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Electrical Machines
The wattage rating of a ceiling fan motor will be

  50 - 150 W.
 200 - 250 W.
 10 - 20 W.
 250 - 500 W.

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