2 Comments

1. 

   M.Mohamedsharifdeen

   2012-11-02T09:42:15+05:30Added a comment on November 2, 2012 at 9:42 am

   A. To decrease the current B. To increase the current C. To decrease the voltage momentarily D. To increase the voltage momentarily

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2. 

   Anonymous

   2012-12-17T06:13:48+05:30Added a comment on December 17, 2012 at 6:13 am

   It causes the tube to ignite by using the back emf to create a plasma in the tube
   It controls the current through the tube

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