The dielectric strength of transformer oil is expected to be______________?
The dielectric strength of transformer oil is expected to be______________?
A. lkV
B. 33 kV
C. 100 kV
D. 330 kV
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Natural oil cooling is used for transformers up to a rating of____________?
Natural oil cooling is used for transformers up to a rating of____________?
A. 3000 kVA
B. 1000 kVA
C. 500 kVA
D. 250 kVAPrimary winding of a transformer________________?
Primary winding of a transformer________________?
A. is always a low voltage winding
B. is always a high voltage winding
C. could either be a low voltage or high voltage winding
D. none of the aboveWhich of the following does not change in a transformer ?
Which of the following does not change in a transformer ?
A. Current
B. Voltage
C. Frequency
D. All of the aboveWhich type of winding is used in 3 phase shell-type transformer?
Which type of winding is used in 3 phase shell-type transformer?
A. Circular type
B. Sandwich type
C. Cylindrical type
D. Rectangular typeLosses which occur in rotating electric machines and do not occur in transformers are___________?
Losses which occur in rotating electric machines and do not occur in transformers are___________?
A. friction and windage losses
B. magnetic losses
C. hysteresis and eddy current losses
D. copper lossesPart of the transformer which is most subject to damage from overheating is_____________?
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