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Electrical Machine Design - Interview Questions and Answers

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16. The resistivity of water should not be less than
A. 10 Q m
B. 100 Q m
C. 1000 Q m
D. 2000 Q m
Explanation:
17. Which of the following methods is most accurate ?
A. Equivalent current method
B. Equivalent power method
C. Equivalent torque method
D. Method of average losses
Explanation:
18. The slot leakage can be calculated by making which of the following assumptions ?
A. The current in the slot conductors is uniformly distributed over their cross-section
B. The leakage path is straight across the slot and around the iron at the bottom
C. The permanence of air paths is only considered. The reluctance of iron paths is assumed as zero
D. All of the above
Explanation:
19. The noise produced by a ______ cooled machine is less as the rotor moves in a medium of smaller density.
A. air
B. hydrogen
C. either (a) or (b)
D. none of the above
Explanation:
20. In self cooled motors the cooling time constant is about ______ than the heating time constant because cooling conditions are worse at standstill.
A. 2 to 3 times greater
B. 3 to 4 times greater
C. 4 to 5 times greater
D. none of the above
Explanation:
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