Sumpner’s test is conducted on transformers to determine_____________?
Sumpner’s test is conducted on transformers to determine_____________?
A. temperature
B. stray losses
C. all-day efficiency
D. none of the above
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A transformer core is laminated to__________?
A transformer core is laminated to__________?
A. reduce hysteresis loss
B. reduce eddy current losses
C. reduce copper losses
D. reduce all above lossesIn a transformer the resistance between its primary and secondary is____________?
In a transformer the resistance between its primary and secondary is____________?
A. zero
B. 1 ohm
C. 1000 ohms
D. infiniteWhen a given transformer is run at its rated voltage but reduced frequency, its____________?
When a given transformer is run at its rated voltage but reduced frequency, its____________?
A. flux density remains unaffected
B. iron losses are reduced
C. core flux density is reduced
D. core flux density is increasedMaterial used for construction of transformer core is usually___________________?
Material used for construction of transformer core is usually___________________?
A. wood
B. copper
C. aluminium
D. silicon steelThe function of breather in a transformer is___________?
The function of breather in a transformer is___________?
A. to provide oxygen inside the tank
B. to cool the coils during reduced load
C. to cool the transformer oil
D. to arrest flow of moisture when outside air enters the transformerThe use of higher flux density in the transformer design____________?
The use of higher flux density in the transformer design____________?
A. reduces weight per kVA
B. reduces iron losses
C. reduces copper losses
D. increases part load efficiency