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Electrical Machines

Electrical Machines
Total core loss is also called as -------------?

 Hysteresis loss
 Copper loss
 Magnetic loss
 Eddy current loss

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Electrical Machines
The output voltage of a DC generator is

 E = V + Ra.
 E = V + Ia.
 E = V – IaRa.
  E = V + IaRa.

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Electrical Machines
Which of the following is not a necessary condition to be satisfied for synchronising an incoming alternator to an already operating alternator?

 same voltage magnitude
 same frequency
 same prime mover speed
 same phase sequence

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Electrical Machines
Which of the following is/are effects of armature reaction?

 increase the maintenance and repair
 increase the iron loss
 increases the design cost
All of these

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Electrical Machines
Open circuit test on transformer gives

 both 1and 2
 eddy current loss
 hysteresis loss
 copper loss

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Electrical Machines
If starter is not used with large DC motor for starting, it will

 damage the armature and commutator.
 all of above.
 draw a starting current many times its rated full load current.
 provide execessive voltage drop in line.

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