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Electrical Machines

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

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

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Electrical Machines
In DC generator, armature reaction refers to what?

None of these
 Effect of field flux on the armature flux.
 Effect of armature flux on the load.
  Effect of armature flux on the main field flux.

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Electrical Machines
In induction motor when the length of the air gap is increased, the magnetizing current of the motor increases while the short circuit current __________________.

 kept constant to certain value.
 increased.
  remains unchanged.
 decreased.

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Electrical Machines
A DC motor with armature resistance of 0.5 ohms connected directly to a 220 Volt supply. If the armature is stationary then the current flowing through the armature is

 340 A.
 250 A.
 570 A.
 440 A.

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Electrical Machines
Brushes are always placed on--------------- , in order to achieve sparkles commutation?

 either GNA or MNA
None of these
 MNA
 GNA

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Electrical Machines
The ventilating ducts in most of DC machine are

 none of these.
 longitudinal.
 radial.
 radial as well as longitudinal.

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