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Electrical Machine Design - Interview Questions and Answers

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56. The heat dissipated by from a surface depends upon its temperature and its characteristics like colour, roughness etc.
A. conduction
B. convection
C. radiation
D. any ofthe above
Explanation:
57. The flash point of transformer oil should be higher than
A. 40�C
B. 60�C
C. 80�C
D. 104�C
Explanation:
58. 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
Explanation:
59. A practical formula for determining the thickness of insulation between low voltage and high voltage windings is
A. 1 + 0.2 kVmm
B. 2 + 0.5 kVmm
C. 4 + 0.7 kV mm
D. 5 + 0.9 kV mm
Explanation:
60. Disc windings are primarily used in
A. short capacity transformers
B. medium capacity transformers
C. high capacity transformers
D. any of the above
Explanation:
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