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Electrical Machine Design - Interview Questions and Answers

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76. The operation of a D.C. machine with large air gap lengths is comparatively
A. quiet
B. noisy
C. either of the above
D. none of the above
Explanation:
77. In D.C. machines, the ____ in field mmf results in increase in size and cost of machines.
A. increase
B. decrease
C. either of the above
D. none of the above
Explanation:
78. Hot rolled sheets have ______ value of permeability
A. zero
B. low
C. high
D. none ofthe above
Explanation:
79. In D.C. machines the width of the duct is usually
A. 4 mm
B. 6 mm
C. 8 mm
D. 10 mm
Explanation:
80. D.C. machines designed with a large value of air gap length have
A. worst, ventilation
B. poor ventilation
C. better ventilation
D. none of the above
Explanation:
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