Silicon steel used in lamination’s mainly reduces___________?
Silicon steel used in lamination’s mainly reduces___________?
A. hysteresis loss
B. eddy current losses
C. copper losses
D. all of the above
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A transformer can have zero voltage regulation at______________?
A transformer can have zero voltage regulation at______________?
A. leading power factor
B. lagging power factor
C. unity power factor
D. zero power factorThe 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 relayThe chemical used in breather for transformer should have the quality of____________?
The chemical used in breather for transformer should have the quality of____________?
A. ionizing air
B. absorbing moisture
C. cleansing the transformer oil
D. cooling the transformer oilThe efficiency of two identical transformers under load conditions can be determined by_______________?
The efficiency of two identical transformers under load conditions can be determined by_______________?
A. short-circuit test
B. back-to-back test
C. open circuit test
D. any of the aboveWhich of the following loss in a transformer is zero even at full load ____________?
Which of the following loss in a transformer is zero even at full load ____________?
A. Core loss
B. Friction loss
C. Eddy current loss
D. Hysteresis lossThe core used in high frequency transformer is usually___________?
The core used in high frequency transformer is usually___________?
A. copper core
B. cost iron core
C. air core
D. mild steel core