11. Major sources of noise in furnace operation arises from air inspirators, combustion, side wall vibrations and fluctuation in the process heat load. A 50% increase in fuel firing rate may increase the furnace noise level by about __________ decibels.
12. Exposure to chemicals having carcinogenic properties cause
13. Exposure to chemicals having carcinogenic properties cause
14. Beyond what concentration of H2S in air, acute danger to human life exists?
15. The main pollutant in waste water discharged from a petroleum refinery is oil (both in free and emulsified form). Free oil is removed by
16. Water filtration rate in a slow sand filter ranges from __________ litres/m2/hr.
17. Main pollutants released from iron & steel industry is
18. The principal gas evolved from sludge digestion tank is
19. Pick out the wrong statement pertaining to 'green house' for the plants.
20. Insufficient washing of sand grains in a rapid sand filter causes
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