A. Corrugations
B. Fins
C. Tubes
D. Radiator tanks
E. All of the above
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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...
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