Transformers with a capacity of up to __________ have a cooling radiator system with natural cooling?
A. 2 MVA
B. 5 MVA
C. 7.5 MVA
D. 10 MVA
A. 2 MVA
B. 5 MVA
C. 7.5 MVA
D. 10 MVA
A. Adjustment of voltage at consumers premises within statutory limits
B. Control of active and reactive power
C. Adjustment of short period daily and seasonal voltage variations in accordance with variations of load
D. All of the above
A. Electrical considerations
B. Mechanical considerations
C. Thermal considerations
D. All of the above
Which of the following is the basic consideration in the design of insulation ? Read More »
Electrical Machine Design A. 1.5 to 2.5 A/mm2
B. 3.5 to 4.5 A/mm2
C. 4.0 to 5.0 A/mm2
D. 5.4 to 6.2 A/mm2
A. 1.0 Wb/m2
B. 1.1 Wb/m2
C. 1.3 Wb/m2
D. 1.6 Wb/m2
E. None of the above
A. sometimes 2-layer type
B. never 2-layer type
C. always 2-layer type
D. none of the above
D.C. windings are____________? Read More »
Electrical Machine Design A. Cylindrical winding with circular conductors
B. Cross-over winding with either circular or small rectangular conductors
C. Continuous disc type winding with rectangular conductors
D. All of the above types
The high voltage winding is usually which of the following type ? Read More »
Electrical Machine Design A. 40°C
B. 60°C
C. 80°C
D. 104°C
The flash point of transformer oil should be higher than_______________? Read More »
Electrical Machine Design A. 0.5 to 0.8 Wb/m2
B. 0.8 to 1.0 Wb/m2
C. 1.1 to 1.35 Wb/m2
D. 1.4 to 1.8 Wb/m2
A. 1.0 to 1.2 A/mm2
B. 1.5 to 2.0 A/mm2
C. 2.2 to 3.2 A/mm2
D. 3.2 to 4.2 A/mm2