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Electrical Machine Design - Interview Questions and Answers

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26. The time taken by the machine to attain 0.632 of its final steady temperature rise is called
A. heating time constant
B. cooling time constant
C. either (a) or (b)
D. none of the above
Explanation:
27. Dummy coil should not be used in
A. small machines
B. large machines
C. either (a) or (b)
D. none of the above
Explanation:
28. Tractive magnets are operated from
A. a.c. supply
B. d.c. supply
C. either a.c. or d.c. supply
D. none of the above
Explanation:
29. The winding where dummy coils are used is sometimes called
A. duplex winding
B. triplex winding
C. forced winding
D. none of the above
Explanation:
30. By which of the following methods the temperature rise of windings and other parts may be determined ?
A. Thermometer method
B. Resistance method
C. Embedded temperature detector method
D. Any of the above
Explanation:
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