A. load is balanced only
B. load is unbalanced only
C. on balanced as well as unbalanced loads
D. none of the above
Related Mcqs:
- Star/star transformers work satisfactorily when________________?
A. load is unbalanced only
B. load is balanced only
C. on balanced as well as unbalanced loads
D. none of the above - 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 - 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 relay - No-load on a transformer is carried out to determine______________?
A. copper loss
B. magnetising current
C. magnetising current and loss
D. efficiency of the transformer - A common method of cooling a power transformer is_______________?
A. natural air cooling
B. air blast cooling
C. oil cooling
D. any of the above - Gas is usually not liberated due to dissociation of transformer oil unless the oil temperature exceeds?
A. 50°C
B. 80°C
C. 100°C
D. 150°C - If the supply frequency to the transformer is increased,”the iron loss will__________?
A. not change
B. decrease
C. increase
D. any of the above - Which of the following is the most likely source of harmonics in a transformer ?
A. poor insulation
B. Overload
C. loose connections
D. Core saturation - Part of the transformer which is most subject to damage from overheating is_____________?
A. iron core
B. copper winding
C. winding insulation
D. frame or case
E. transformer tank - Which of the following parts of a transformer is visible from outside ?
A. Bushings
B. Core
C. Primary winding
D. Secondary winding
