Important Industrial Drive Multiple Choice Questions and Answers

11.  The motor in close are used for collieries, chemical plant is

   A. Flame proof type

   B. Splash proof type

   C. Totally enclosed type

   D. Pipe ventilated type

12.  The motor enclosure used in wood-working industry is

   A. Protected type

   B. Totally enclosed fan cooled type

   C. Flame proof type

   D. Splash proof type

13.  The motor enclosure used for industrial purposes is

   A. Protected type

   B. Drip proof type

   C. Totally enclosed type

   D. Open type

14.  Ball-bearings are

   A. Used up to 75 kW motors

   B. Of long life and low friction loss

   C. Costlier and noisy particularly at high speed motor

   D. All of the above

15.  Sleeve bearings

   A. Are normally of bronze

   B. Have self lubricating properties

   C. Are used where noise is to be avoided

   D. All of the above

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