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Electrical Machines

Electrical Machines
Open circuit test on transformer gives

 both 1and 2
 hysteresis loss
 eddy current loss
 copper loss

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Electrical Machines
Cross magnetization effects which of the following?

 both 2 and 3
 commutation
 reduces the terminal voltage
 reduction in main field flux

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Electrical Machines
Series generators are used in which of the following applications?

All of these
 Air crafts.
 Used as boosters in dc distribution or transmission.
 Arc welding.

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Electrical Machines
In a synchronous machine, if φ is the flux per pole and f is the frequency of the emf induced E then

 E ∝ 1/(φf)
 E ∝ φ/f
 E ∝ f/φ
 E ∝ φf

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Electrical Machines
A DC generator beyond critical resistance will generate

 maximum voltage.
 no voltage.
 maximum power.
 maximum current.

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Electrical Machines
For pure resistive load what is the armature reaction?

 cross magnetization
 demagnetization
All of these
 magnetization

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MORE MCQ ON Electrical Machines

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