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Electrical Machine Design - Interview Questions and Answers

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61. In transformers using hot rolled steel, the cross-section of the yoke is made about _____ greater than that of the core
A. 5 percent
B. 10 percent
C. 15 percent
D. 30 percent
Explanation:
62. Power transformers should be designed to have maximum efficiency
A. at one-fourth load
B. at one-half load
C. at or near full load
D. any of the above
Explanation:
63. 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
Explanation:
64. Multi-layer helical windings are commonly used in the transformers as high voltage windings
A. upto 20 kV
B. upto 50 kV
C. upto 80 kV
D. for 110 kV and above
Explanation:
65. In a D.C. machine, the value of peripheral speed should not, normally, exceed
A. 10 m/s
B. 20 m/s
C. 30 m/s
D. 40 m/s
Explanation:
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