Environmental Engineering Questions

• A masonry structure built below ground level, where biochemical reaction takes place due to anaerobic bacteria is called
• The detrimental effect on organism and water quality with temperature rise of aquatic system is the reduction of __________ of water.
• Deaeration of high pressure boiler feed water is done to reduce
• The common pollutant generated in chlor-alkali industry and battery manufacture is
• Which of the following air pollutants is not toxic to vegetation i.e., doesn't cause vegetation damage?
• Soluble silica present in boiler feed water can be removed by
• Exposure to SO2 containing chimney gases results in the
• Reingleman chart No. 2 corresponds to __________ percent black smoke.
• Inhalation of silica dust by human being during hand drilling in mica mining, lead & zinc mining, silica refractory manufacture and in foundaries causes
• 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.
• Which of the following is the most efficient for removal of very finely divided suspended solids and colloidal matter from the polluted water stream?
• White smoke coming out of the chimney of a furnace indicates the use of
• A man exposed to excessive noise level in the working environment may suffer from
• Green house gases blanket/block the infrared radiation from earth's surface to the atmosphere leading to its progressive warming up. Which of the following gases does not exhibit green house effect?
• Which of the following plants does not emit appreciable amount of SO2 in atmosphere?
• Which is the most efficient dust removal equipment for removal of sub-micronic dust particles from blast furnace gas?
• 'Safe limit' called Threshold Limit Value (TLV) of carbon monoxide in atmospheric air is < 50 ppm. The main source of carbon monoxide pollutant in air is the
• Inhalation of silica dust by human being causes
• Smog is
• A considerable part of the harmful ultraviolet radiation of the sum does not reach the earth surface, because of the fact that, there is a layer of __________ high above earth's atmosphere, which absorbs it.