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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A. Belt drive

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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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B. Rope drive

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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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A. Light duty cranes

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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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C. 30 minutes

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