A transformer can have regulation closer to zero___________?
A transformer can have regulation closer to zero___________?
A. on full-load
B. on overload
C. on leading power factor
D. on zero power factor
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Short circuit test on transformers is conducted to determine____________?
Short circuit test on transformers is conducted to determine____________?
A. hysteresis losses
B. copper losses
C. core losses
D. eddy current lossesThe efficiency of a transformer, under heavy loads, is comparatively low because_______________?
The efficiency of a transformer, under heavy loads, is comparatively low because_______________?
A. copper loss becomes high in proportion to the output
B. iron loss is increased considerably
C. voltage drop both in primary and secondary becomes large
D. secondary output is much less as compared to primary inputIf R2 is the resistance of secondary winding of the transformer and K is the transformation ratio then the equivalent secondary resistance referred to primary will be___________?
If R2 is the resistance of secondary winding of the transformer and K is the transformation ratio then the equivalent secondary resistance referred to primary will be___________?
A. R2/VK
B. R2IK2
C. R22!K2
D. R22/KThe efficiencies of transformers compared with that of electric motors of the same power are____________?
The efficiencies of transformers compared with that of electric motors of the same power are____________?
A. about the same
B. much smaller
C. much higher
D. somewhat smaller
E. none of the aboveAn ideal transformer has infinite values of primary and secondary inductances. The statement is______________?
An ideal transformer has infinite values of primary and secondary inductances. The statement is______________?
A. true
B. falseThe chemical used in breather is_______________?
The chemical used in breather is_______________?
A. asbestos fiber
B. silica sand
C. sodium chloride
D. silica gel