Important Industrial Drive Multiple Choice Questions and Answers

6.  In jaw crushers a motor has to often start against....... load

   A. Heavy

   B. Medium

   C. Normal

   D. Low

7.  Flame proof motors are used in

   A. Paper Mills

   B. Steel mills

   C. Moist atmospheres

   D. Explosive atmospheres

8.  ........has least range of speed control

   A. Slip ring induction motor

   B. Synchronous motor

   C. DC shunt motor

   D. Schrage motor

9.  In series motor which of the following methods can be used for changing the flux per pole?

   A. Tapped field control

   B. Diverter field control

   C. Series-parallel control

   D. Any of the above

10.  Which of the following alternatives will be cheaper ?

   A. A 100 HP ac three phase motor

   B. Four motors of 25 HP each

   C. Five motors of 20 HP each

   D. 10 motors of 10 HP each

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