Important Electrical Machine Design Multiple Choice Questions and Answers
11. CRGOS has .......... In comparison to hot rolled silicon steel
A. Better finish
B. Improved space factor.
C. Much better magnetic properties
D. All of the above
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D. All of the above
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12. CRGOS has .......... permeability in the direction of grain orientation
A. Nil
B. Maximum
C. Minimum
D. None of the above
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13. The brush friction loss depends upon
A. Peripheral speed of commutator
B. brush pressure
C. Co-efficiant of friction between brush and the commutator
D. All of the above
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14. ........ Brushes are used for higher values of current density
A. Metal graphite
B. Hard carbon
C. Neutral graphite
D. Carbon
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15. The brushes are staggered to
A. Avoid eating away of copper due to arcing
B. Avoid ridge and to have even commutator surface
C. Reduce brush contact loss
D. Reduce armature reaction
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