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Electrical Machine Design - Interview Questions and Answers

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71. In D.C. machines the number of slots per pole usually lies
A. between 2 to 4
B. between 6 to 8
C. between 9 to 16
D. between 20 to 30
Explanation:
72. The laminations of the armature of a D.C. machine are usually _____ thick.
A. 0.1 to 0.2 mm
B. 0.2 to 0.3 mm
C. 0.3 to 0.4 mm
D. 0.4 to 0.5 mm
Explanation:
73. The weight of copper of both armature and field windings decreases with _____ in number of poles.
A. increase
B. decrease
C. either of the above
D. none of the above
Explanation:
74. Which of the following brushes can be used for high values of current density ?
A. Metal graphite brushes
B. Hard carbon brushes
C. Electro-graphitic brushes
D. Natural graphite brushes
Explanation:
75. In D.C. machines the usual limit of slot pitch is
A. between 5 to 10 mm
B. between 10 to 15 mm
C. between 15 to 20 mm
D. between 25 to 35 mm
Explanation:
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