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


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A. 5 to 10%

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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


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D. Electrolytic rectifiers

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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


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B. Selenium rectifiers

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


   A. 10 V

   B. 30 V

   C. 60 V

   D. 100 V


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D. 100 V

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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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D. Graphite

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