21. Modern incandescent lamps have luminous efficiency is from . . . . . . . . A. 5 - 8 B. 8 - 10 C. 12 - 15 D. 10 - 20 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
22. Provision of stone dust barrier has been given in which of the following circulars. A. 3/1975 B. 1975 C. 5/1975 D. 6/1975 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
23. Illumination of a surface is measured in . . . . . . . . A. Lux B. Lumen C. MSCP D. MHCP 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
24. Glare is reduced with the use of . . . . . . . . A. In candescent lamp B. Bulbs with high luminous intensity C. Flurorescent lamp D. Light reflecting paints 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
25. The disease caused by inhalation of silica particles. A. Silicons B. Sidorosis C. Asbestosis D. None 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
26. The lead acid battery consists of . . . . . . . . cells. A. 1 B. 2 C. 4 D. 6 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
27. Fluorescent tubes reduces . . . . . . . . A. Glare B. Lumens C. Shadow effects D. All 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
28. In self contained O2 breathing apparatus the weaver can take more O2 than gets through the circuit by the . . . . . . . . A. Main value B. Relief valve C. Bypass valve D. Reducing valve 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
29. The cooling agent in protosorb breathing apparatus is . . . . . . . . A. Sodium phosphate B. Methyl chloride C. Sodium chloride D. Calcium hydroxide 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
30. The weight of fuel oil in GL-60 flame safety lamp. A. 1.2 kg B. 1.7 kg C. 1.9 kg D. 2 kg 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