Efficiency of a power transformer is of the order of________________?
Efficiency of a power transformer is of the order of________________?
A. 100 per cent
B. 98 per cent
C. 50 per cent
D. 25 per cent
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The function of conservator in a transformer is___________________?
The function of conservator in a transformer is___________________?
A. to project against’internal fault
B. to reduce copper as well as core losses
C. to cool the transformer oil
D. to take care of the expansion and contraction of transformer oil due to variation of temperature of sur-roundingsThe hum in a transformer is mainly attributed to______________?
The hum in a transformer is mainly attributed to______________?
A. load changes
B. oil in the transformer
C. magnetostriction
D. mechanical vibrationsWhich 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. ConservatorThe 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 transformerHysteresis loss in a transformer varies as CBmax = maximum flux density) ?
Hysteresis loss in a transformer varies as CBmax = maximum flux density) ?
A. Bmax
B. Bmax1-6
C. Bmax1-83
D. B maxA transformer transforms__________________?
A transformer transforms__________________?
A. voltage
B. current
C. power
D. frequency