Rectifier Multiple Choice Questions and Answers


1.  In mercury arc rectifier positive ions are attracted towards


   A. Anode

   B. Cathode

   C. Shell bottom

   D. Mercury pool


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B.Cathode

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2.  The internal efficiency of a mercury arc rectifier depends on


   A. Voltage only

   B. Current only

   C. R.M.S. value of current

   D. Voltage and current


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A. Voltage only

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3.  The voltage drop at anode, in a mercury arc rectifier is due to


   A. Self restoring property of mercury

   B. High ionization potential

   C. Energy spent in overcoming the electrostatic field

   D. High temperature inside the rectifier


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C. Energy spent in overcoming the electrostatic field

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4.  The ionization potential of mercury is approximately


   A. 5.4 V

   B. 8.8 V

   C. 10.4 V

   D. 16.4 V


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C. 10.4 V

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5.  To produce cathode spot in a mercury arc rectified


   A. Anode is heated

   B. Tube is evacuated

   C. An auxiliary electrode is used

   D. Low mercury vapour pressures are used


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C. An auxiliary electrode is used

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