Important Industrial Drive Multiple Choice Questions and Answers

26.  In a paper mill where constant speed is required

   A. Synchronous motors are preferred

   B. AC motors are preferred

   C. Individual drive is preferred

   D. Group drive is preferred

27.  ........is not a part of ball bearing

   A. Inner race

   B. Outer race

   C. Cage

   D. Bush

28.  A pony motor is used for the starting which of the following motors ?

   A. Squirrel cage induction motor

   B. Schrage motor

   C. Synchronous motor

   D. None of the above

29.  ........ has relatively wider range of speed control

   A. Synchronous motor

   B. Slip ring induction motor

   C. Squirrel case induction motor

   D. DC shunt motor

30.  Heat control switches are used in

   A. Transformers

   B.. Cooling ranges

   C. Three phase induction motors

   D. Single face

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