In water treatment, alum[Al2(SO₄)3] is used for the process of Sedimentation Disinfection Coagulation Filtration TRUE ANSWER : ? YOUR ANSWER : ?
Phenolic water generated in coke ovens & by-product plant attached to an integrated steel plant containing phenol in concentration of less than 100 mg/litre can be removed by Chemical coagulation Chlorination None of these Treating in biological oxygen pond TRUE ANSWER : ? YOUR ANSWER : ?
Irradiation of water by ultraviolet light of suitable wavelength is commonly used for disinfection of water in Municipal sewage treatment Iron & steel plant Food industry Petroleum refinery TRUE ANSWER : ? YOUR ANSWER : ?
Which of the following is the most efficient for removal of very finely divided suspended solids and colloidal matter from the polluted water stream? Circular clarifier Sedimentation tank Chemical coagulation Mechanical flocculation TRUE ANSWER : ? YOUR ANSWER : ?
A standard test for determination of hardness in water is termed as __________ test. EDTA Presumptive Total count Electometric TRUE ANSWER : ? YOUR ANSWER : ?
The amount of coagulant needed for coagulation of water increases with(i) Increase in turbidity of water(ii) Decrease in turbidity of water(iii) Increase in temperature of water(iv) Decrease in temperature of waterThe correct answer is (ii) and (iii) (i)and(iv) (i) and (ii) (ii) and (iv) TRUE ANSWER : ? YOUR ANSWER : ?
Reinglemann chart is used for the measurement of the Combustibles present in automobile exhaust Flue gas temperature Exhaust gas density Smoke density from a chimey TRUE ANSWER : ? YOUR ANSWER : ?
Inhalation of silica dust by human being causes Shortness of breath Both B & C Tuberculosis Asphyxiation TRUE ANSWER : ? YOUR ANSWER : ?
Scale formation in boiler is controlled by Preheating of feed water Eliminating H₂S in feed water Reduction in hardness, silica & alumina in feed water Keeping the pH value of feed water just below 7 TRUE ANSWER : ? YOUR ANSWER : ?
Which of the following is an adsorbant used for the removal of SO₂ from gas/air? Bog iron Limestone powder or alkalised alumina Active carbon Silica gel TRUE ANSWER : ? YOUR ANSWER : ?