Environmental Engineering in CE Maximum allowable noise exposure limits for a man working for 8 hours a day in a noisy chemical plant is about __________ decibels. 120 90 60 20 120 90 60 20 ANSWER DOWNLOAD EXAMIANS APP
Environmental Engineering in CE Coal washing waste water containing about 3% suspended solids (comprising of clay, slate, stone etc.) is treated for solid particles removal By chemical coagulation In clarifiers In vacuum filter In sedimentation tanks equipped with mechanical scrapper By chemical coagulation In clarifiers In vacuum filter In sedimentation tanks equipped with mechanical scrapper ANSWER DOWNLOAD EXAMIANS APP
Environmental Engineering in CE The major reason of hydrodynamic noise (i.e., noise resulting from liquid flow) is Boundary layer separation Fluctuation in liquid flow Cavitation Pipe vibrations Boundary layer separation Fluctuation in liquid flow Cavitation Pipe vibrations ANSWER DOWNLOAD EXAMIANS APP
Environmental Engineering in CE The principal gas evolved from sludge digestion tank is N₂ CO₂ CH₄ CO N₂ CO₂ CH₄ CO ANSWER DOWNLOAD EXAMIANS APP
Environmental Engineering in CE The progressive warming up of the earth's surface is mainly due to the Automobile exhaust Blanketing effect of CO₂ in the atmosphere Thickening of ozone layer De-forestation Automobile exhaust Blanketing effect of CO₂ in the atmosphere Thickening of ozone layer De-forestation ANSWER DOWNLOAD EXAMIANS APP
Environmental Engineering in CE The ratio of oxygen available to the oxygen required for stabilisation of sewage is called the Relative stability Biological oxygen demand (BOD) Oxygen ion concentration Bacterial stability factor Relative stability Biological oxygen demand (BOD) Oxygen ion concentration Bacterial stability factor ANSWER DOWNLOAD EXAMIANS APP
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