The lowest layer of atmosphere is known as the
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Chemical Engineering · all questionsEnvironmental Engineering
Environmental Engineering
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__________ is the process of killing organism in water.
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Most of the bacteria in sewage are
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__________ content of the phosphate rock is the pollutant of primary interest in a phos-phatic fertiliser plant.
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The amount of chemical coagulant added for treatment of polluted water __________ with increase in temperature of the polluted water to be treated.
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If carbon monoxide content in atmospheric air exceeds __________ ppm, death is bound to occur.
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Bacterial aerobic oxidation of polluted water in biological oxidation ponds is done to purify it. Presence of bacteria helps in
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In a sedimentation tank, the detention period for water ranges from __________ hours.
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In sewage treatment, the detention period allowed for oxidation ponds ranges from __________ weeks.
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Which of the following is an adsorbant used for the removal of SO2 from gas/air?
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The function of skimming tank in sewage treatment is to remove __________ substances.
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Sooty and sulphurous smog formed due to combustion of fossil fuels particularly in winter, continues throughout the day and night. When the moist atmospheric air's water vapor condenses on the solid particles of smoke thereby forming smog (smoke + fog), it causes
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Threshold Limit Value (TLV) is the maximum allowable concentration (i.e. safe limit) of pollutants in air. Safe limit for SO2 in air is __________ ppm.
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In sewage treatment, its sedimentation is speeded up by commonly adding
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Atmospheric pollution caused by the exhaust gas of supresonic transport air-crafts is mostly in the atmospheric region called
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Noise level heard inside a bus in busy city traffic or inside a sub-way train corresponds to about __________ decibels.
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Out of the following, TLV of __________ is the minimum (about 0.02 ppm).
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Limestone powder is injected during pulverised coal burning in boilers to __________ the flue gases.
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Sound produced by an automobile horn heard at a distance of 1.5 metres corresponds to about __________ decibels.
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Noise level audible to audience sitting in the 5th row from the stage during a large orchestra show corresponds to about __________ decibels.
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