Which winding in a transformer has more number of turns ?
Which winding in a transformer has more number of turns ?
A. Low voltage winding
B. High voltage winding
C. Primary winding
D. Secondary winding
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The changes in volume of transformer cooling oil due to variation of atmospheric temperature during day and night is taken care of by which part of transformer?
The changes in volume of transformer cooling oil due to variation of atmospheric temperature during day and night is taken care of by which part of transformer?
A. Conservator
B. Breather
C. Bushings
D. Buchholz relayWhich of the following acts as a protection against high voltage surges due to lightning and switching ?
Which of the following acts as a protection against high voltage surges due to lightning and switching ?
A. Horn gaps
B. Thermal overload relays
C. Breather
D. ConservatorIf the supply frequency to the transformer is increased,”the iron loss will__________?
If the supply frequency to the transformer is increased,”the iron loss will__________?
A. not change
B. decrease
C. increase
D. any of the aboveIn an actual transformer the iron loss remains practically constant from no load to full load because:____________?
In an actual transformer the iron loss remains practically constant from no load to full load because:____________?
A. value of transformation ratio remains constant
B. permeability of transformer core remains constant
C. core flux remains practically constant
D. primary voltage remains constant
C. secondary voltage remains constantThe magnetising current of a transformer is usually small because it has___________?
The magnetising current of a transformer is usually small because it has___________?
A. small air gap
B. large leakage flux
C. laminated silicon steel core
D. fewer rotating partsWhich of the following is the main advantage of an auto-transformer over a two winding transformer?
Which of the following is the main advantage of an auto-transformer over a two winding transformer?
A. Hysteresis losses are reduced
B. Saving in winding material
C. Copper losses are negligible
D. Eddy losses are totally eliminated