Rectifier Multiple Choice Questions and Answers

16.  Which of the following is the loss within the mercury arc rectifier chamber?

   A. Voltage drop in arc

   B. Voltage drop at the anode

   C. Voltage drop at the cathode

   D. All of the above

17.  The efficiency of an electrolytic rectifier is nearly

   A. 80%

   B. 70%

   C. 60%

   D. 40%

18.  A commuting rectifier consists of commutator driven by

   A. An induction motor

   B. A synchronous motor

   C. A D.C. series motor

   D. A D.C. shunt motor

19.  The efficiency of the copper oxide rectifier exceeds

   A. 90 to 95%

   B. 85 to 90%

   C. 70 to 80%

   D. 65 to 75%

20.  Selenium rectifier can be operated at temperatures as high as

   A. 25⁰C

   B. 40⁰C

   C. 60⁰C

   D. 75⁰C

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