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Electrical Machine Design - Interview Questions and Answers

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66. In a D.C. machine the current per brush arm should not be more than
A. 100 A
B. 200 A
C. 300 A
D. 400 A
Explanation:
67. Which ofthe following materials is used in the manufacture of resistance grids to be used in the starters of large motors ?
A. Copper
B. Aluminium
C. Steel
D. Cast-iron
Explanation:
68. In a D.C. machine the number of brush arms is _____ the number of poles.
A. less than
B. equal to
C. greater than
D. none of the above
Explanation:
69. In D.C. machines, ir order to prevent excessive distortion of field form by the armature reaction, the field mmf must be made
A. equal to that of armature mmf
B. less in comparison with the arma�ture mmf
C. large in comparison with the arma-ture mmf
D. none of the above
Explanation:
70. ______ brushes are fragile and cause excessive wear of commutator,
A. Natural graphite
B. Hard carbon
C. Electro graphitic
D. Metal graphite
Explanation:
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