Rectifier Multiple Choice Questions and Answers

21.  Ageing of a selenium rectifier may change the output voltage by

   A. 5 to 10%

   B. 15 to 20%

   C. 25 to 30%

   D. None of the above

22.  Which off the following rectifiers are primarily used for charging of low-voltage batteries from AC supply ?

   A. Mechanical rectifiers

   B. Copper oxide rectifiers

   C. Selenium rectifiers

   D. Electrolytic rectifiers

23.  Which of the following rectifiers have been used extensively in supply direct current for electroplating

   A. Copper oxide rectifiers

   B. Selenium rectifiers

   C. Mercury arc rectifiers

   D. Mechanical rectifiers

24.  The applications of selenium rectifiers are usually limited to potential of

   A. 10 V

   B. 30 V

   C. 60 V

   D. 100 V

25.  In a mercury arc rectifier fire the anode is usually made of

   A. Copper

   B. Aluminium

   C. Silver

   D. Graphite

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