11. The supervisory staff in coal mines therefore required to undergo periodical eye testing once in . . . . . . . . years.
12. Anthra cosis comes under inorganic dust producing group of . . . . . . . .
13. The maximum air velocity at the face is . . . . . . . .
14. The type of flame safety lamps is permitted by DGMS for gas testing in Deg.1 and Deg.2 gassy mines of coal.
15. Sudden irush of water into active workings of the mine.
16. Worst disaster caused by inundetion of mines was at chasnala colliery in Bihar in . . . . . . . .
17. Find the H.P assistancedue to NVP if the w.g is 12.07 mm of wg and air passing in DC shaft is 100m3/sec.
18. The thickness and height of temporary dam is . . . . . . . .
19. Lumens emitted by a lamp . . . . . . . .
20. In which of the following Indian mines first refrigeration plant was installed in
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