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Electrical Machines

Electrical Machines
When a transformer is loaded, the secondary terminal voltage drops. That means power factor is

  lagging.
 leading.
 unity.
 zero.

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Electrical Machines
Which of the following are variable losses?

 hysteresis loss
 shunt field copper loss
 armature copper loss
 eddy current loss

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Electrical Machines
Iron loss in a transformer mainly occurs in

 winding of transformer.
 iron made tank of transformer.
 transformer insulating oil.
 steel core in transformer.

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Electrical Machines
DC motors are stopped by opening line switches and not by forcing the handle of the motor starter back to OFF position. This is due to occurance of

 Both of above.
 Heavy sparking at brushes.
 Heavy sparking at the first stud of starting resistance steps.
 None of these.

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Electrical Machines
The direction of rotation of a 3 - Φ induction motor is clockwise when it is supplied with 3 - Φ sinusoidal voltage having phase sequence A - B - C. For counterclockwise rotation of motor, the phase sequence of the supply should be

 B - C - A or C - A - B.
 C - A - B.
 B - C - A.
  A - C - B.

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

 MNA
 GNA
 either GNA or MNA
None of these

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