41. The advantage of mercury arc rectifier is that A. it is light in weight and occupies small floor space B. it has high efficiency C. it has high overload capacity D. it is comparatively noiseless E. all of the above Answer & Solution Discuss in Board Save for Later Answer & Solution Answer: Option E No explanation is given for this question Let's Discuss on Board
42. The potential drop in the arc, in a mercury arc rectifier, varies A. 0.05 V to 0.2 V per cm length of the arc B. 0.5 V to 1.5 V per cm length of the arc C. 2 V to 3.5 V per cm length of the arc D. none of the above Answer & Solution Discuss in Board Save for Later Answer & Solution Answer: Option D No explanation is given for this question Let's Discuss on Board
43. In selenium rectifiers efficiencies ranging from ______ to ______ percent are attainable A. 25, 35 B. 40, 50 C. 60, 70 D. 75, 85 Answer & Solution Discuss in Board Save for Later Answer & Solution Answer: Option D No explanation is given for this question Let's Discuss on Board
44. The metal rectifiers, as compared to mercury arc rectifiers A. operate on low temperatures B. can operate on high voltages C. can operate on heavy loads D. give poor regulation E. none of the above Answer & Solution Discuss in Board Save for Later Answer & Solution Answer: Option A No explanation is given for this question Let's Discuss on Board
45. In a mercury arc rectifier positive ions are attracted towards A. anode B. cathode C. shell bottom D. mercury pool Answer & Solution Discuss in Board Save for Later Answer & Solution Answer: Option B No explanation is given for this question Let's Discuss on Board
46. The internal efficiency of a mercury arc rectifier depends on A. voltage only B. current only C. voltage and current D. r.m.s. value of current E. none of the above Answer & Solution Discuss in Board Save for Later Answer & Solution Answer: Option A No explanation is given for this question Let's Discuss on Board
47. The ignited or auxiliary anode in mercury arc rectifier is made of A. Graphite B. Boron carbide C. Aluminium D. Copper Answer & Solution Discuss in Board Save for Later Answer & Solution Answer: Option B No explanation is given for this question Let's Discuss on Board
48. The cathdde voltage drop, in a mercury arc rectifier, is due to A. expenditure of energy in ionization B. surface resistance C. expenditure of energy in overcoming the electrostatic field D. expenditure of energy in liberating electrons from the mercury Answer & Solution Discuss in Board Save for Later Answer & Solution Answer: Option D No explanation is given for this question Let's Discuss on Board
49. In a rotary converter armature currents are A. d.c. only B. a.c. only C. partly a.c. and partly d.c. D. none of the above Answer & Solution Discuss in Board Save for Later Answer & Solution Answer: Option C No explanation is given for this question Let's Discuss on Board
50. In a mercury arc rectifier______ flow from anode to cathode A. ions B. electrons C. ions and electrons D. any of the above Answer & Solution Discuss in Board Save for Later Answer & Solution Answer: Option A No explanation is given for this question Let's Discuss on Board
