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Electrical Machines

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

 MNA
 either GNA or MNA
 GNA
None of these

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

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

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Electrical Machines
The polarity of a DC generator can be reversed by

 any of above.
 increasing field current.
 reversing the field current.
 reversing field electric current as well as direction of rotation.

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Electrical Machines
Normally for the design of transformer the ambient temperature is taken as

  45°C.
 35°C.
 27°C.
 32°C.

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Electrical Machines
For a standard frequency the machine operates at a particular speed known as

 any of the above.
 normal speed.
 synchronous speed.
 slip speed.

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Electrical Machines
Maximum power will be developed when back emf is

All of these
 double the supply voltage.
 equal to supply voltage.
 half of the supply voltage.

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MORE MCQ ON Electrical Machines

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