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ELECTRICAL MACHINES

Electrical Machines
Demagnetization effects which of the following?

 both B and C
 reduction in main field flux
 reduces the terminal voltage
 commutation

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

 either GNA or MNA
 GNA
None of these
 MNA

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Electrical Machines
Flux density under trailing pole tips in case of generator will

 either increase or decrease
 decrease
 increase
None of these

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Electrical Machines
Flux density under leading pole tips in case of generator will

None of these
 increase
 decrease
 either increase or decrease

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

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

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