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Electrical Machine Design - Interview Questions and Answers

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21. The distance between the starts of two consecutive coils measured in terms of coil sides is called
A. front pitch
B. winding pitch
C. commutator pitch
D. back pitch
Explanation:
22. The value of exciting or magnetizing current depends upon which of the following factors ?
A. Total m.m.f. required
B. The number of turns in the exciting winding
C. The way in which the winding is distributed
D. All of the above
Explanation:
23. Commercial available medium size machines have a speed range of ______ .
A. 200 to 400 r.p.m.
B. 600 to 1000 r.p.m.
C. 1000 to 1500 r.p.m.
D. 2000 to 2500 r.p.m.
Explanation:
24. With conventional hydrogen cooling it is possible to increase the rating of a single unit to
A. 50 MW
B. 100 MW
C. 200 MW
D. none ofthe above
Explanation:
25. With direct water cooling it is possible to have ratings of about
A. 200 MW
B. 300 MW
C. 400 MW
D. 600 MW
Explanation:
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