A. Corrugations
B. Fins
C. Tubes
D. Radiator tanks
E. All of the above
Related Mcqs:
- cooling is the process of dissipating the armature and field winding losses to a cooling medium circulating within the winding insulation wall______________?
A. Direct
B. Indirect
C. Conventional
D. Any of the above - With direct water cooling it is possible to have ratings of about_____________?
A. 200 MW
B. 300 MW
C. 400 MW
D. 600 MW - For large power transformers, self oil cooled type or air blast type which of the following values of current density may be used?
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 - For 275 kV transformers, using cold rolled grain oriented steel, which of the following values of flux density may be used?
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 - Aluminium when adopted as a conductor material in __________ transformers, decreases the overall cost of the transformer?
A. small size
B. medium size
C. large size
D. any of the above size - The usual values of maximum flux densities for distribution transformers using hot rolled silicon steel are______________?
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 - 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 - The forced oil and air circulation method is usual one for transformers of capacities____________?
A. upto 5 MVA
B. upto 10 MVA
C. upto 20 MVA
D. 30 MVA upwards - A current density of __________ is ilsed for large power transformers with forced circulation of oil or with water cooling coils?
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 - Cylindrical windings using circular conductors, employed in transformers, are_____________?
A. single layered
B. double layered
C. multi-layered
D. none of the above
