51. The voltage drop between the anode and cathode, of a mercury arc rectifier comprises of the following A. anode drop and cathode drop B. anode drop and arc drop C. cathode drop and arc drop D. anode drop, cathode drop and arc drop 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
52. In which of the following appUcations, direct current is absolutely essential ? A. Illumination B. Electrolysis C. Variable speed operation D. Traction 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
53. In phase-shift control method the control is carried out by varying the of grid voltage. A. magnitude B. polarity C. phase D. any of the above E. 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
54. A mercury arc rectifier possesses ________ regulation characteristics A. straight line B. curved line C. exponential 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
55. The ionization potential of mercury is approximately A. 5.4 V B. 8.4 V C. 10.4 V D. 16.4 V 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
56. Selenium rectifier can be operated at temperatures as high as A. 25°C B. 40°C C. 60°C D. 75°C 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
57. Which of the following is reversible in action? A. Motor generator set B. Motor converter C. Rotary converter D. Any of the above E. 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
58. A rotary converter operates at a A. low power factor B. high power factor C. zero power factor D. none of the above 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