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Electrical Machines

Electrical Machines
Open circuit test on transformer gives

 copper loss
 hysteresis loss
 eddy current loss
 both 1and 2

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Electrical Machines
Which of the following starter is sufficient to start the DC series motor ?

 3 point starter
All of these
 2 point starter
 4 point starter

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Electrical Machines
A 4-pole dc generator runs at 1500 rpm. The frequencyof current in the armature winding is

 50 Hz
 0 Hz
 25 Hz
 100 Hz

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Electrical Machines
Breather is provided in a transformer to

 provide cold air in transformer.
 filter the transformer oil.
  absorb moisture of air during breathing.
 absorb moisture from air entering in transformer.

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Electrical Machines
In DC shunt motor if load is increased, the speed

 increased slightly.
 remains constant.
 reduce slightly.
 increase proportional.

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Electrical Machines
The mechanical power is developed by a DC motor is maximum when

 back emf is equal to twice of applied voltage.
 back emf is equal to applied voltage.
 back emf is equal to half of applied voltage.
 none of above.

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