Important Industrial Drive Multiple Choice Questions and Answers
16. Hot bearings of a DC motor may be caused by
A. Poor ventilation
B. Incorrect voltage
C. Loose coupling
D. Lack of or dirty lubricant
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D. Lack of or dirty lubricant
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17. The least expensive drive is
A. Belt drive
B. Rope drive
C. Chain drive
D. Any of the above
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18. For very high speed ratio the indispensable drive is
A.. Direct drive
B. Rope Drive
C. Chain drive
D. Any of the above
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19. 15 minute rated motors are suitable for
A. Light duty cranes
B. Medium duty cranes
C. Heavy duty cranes
D. All of the above
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20. For medium duty cranes the short time rating motor used is
A. 10 minutes
B. 15 minutes
C. 30 minutes
D. any of the above
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