21. Modern incandescent lamps have luminous efficiency is from . . . . . . . .
22. Provision of stone dust barrier has been given in which of the following circulars.
23. Illumination of a surface is measured in . . . . . . . .
24. Glare is reduced with the use of . . . . . . . .
25. The disease caused by inhalation of silica particles.
26. The lead acid battery consists of . . . . . . . . cells.
27. Fluorescent tubes reduces . . . . . . . .
28. In self contained O2 breathing apparatus the weaver can take more O2 than gets through the circuit by the . . . . . . . .
29. The cooling agent in protosorb breathing apparatus is . . . . . . . .
30. The weight of fuel oil in GL-60 flame safety lamp.
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