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
✔ View Answer
B.Cathode
✍ Your Comments
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
✔ View Answer
✍ Your Comments
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
✔ View Answer
✍ Your Comments
4. The ionization potential of mercury is approximately
A. 5.4 V
B. 8.8 V
C. 10.4 V
D. 16.4 V
✔ View Answer
✍ Your Comments
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
✔ View Answer
✍ Your Comments