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Alanco Questions with Answers on Water Treatment
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Alanco Technical Test Questions with Answers
Posted on :27-04-2016
Q1. Zeolite softening process removes
A. only temporary hardness of waterB. only permanent hardness of waterC. both temporary and permanent hardness of waterD. the dissolved gases in permanent hard water
Q2. Conventional tertiary treatment is
A. chemical coagulation and flocculationB. filtrationC. sedimentationD. none of these
Q3. The chemical oxygen demand (COD)measures the
A. amount of oxygen required for growth of microorganisms in waterB. amount of oxygen that would be removed from the water in order to oxidize pollutionC. amount of oxygen required to oxidize the calcium present in waste waterD. none of the above
Q4. Permanent hard water may be softened by passing it through
A. sodium silicateB. sodium bicarbonateC. sodium hexametaphosphateD. sodium phosphate
Q5. Temporary hardness of water is caused by the presence of
A. chlorides of calcium and magnesiumB. sulfates of calcium and magnesiumC. bicarbonates of calcium and magnesiumD. carbonates of sodium and potassium
Q6. Acid used mostly for removal of milk stone is
A. phosphoric acidB. nitric acidC. gluconic acidD. tartaric acid
Q7. Which of the following chemical is sometime added in the process of coagulation and flocculation?
A. Aluminum sulphateB. Aluminum oxideC. Calcium chlorideD. None of these
Q8. Sanitizer used specifically for vitreous enamel are
A. strong alkalisB. strong acidsC. weak alkali with sodium silicateD. none of these
Q9. Inhibitors are used along with sanitizer to
A. improve their actionB. to prevent corrosionC. both (a) and (b)D. none of these
Q10. Sedimentation is a physical process used in wastewater treatment to
A. remove particles that are less dense than waterB. remove particles that are more dense than waterC. remove the pertinacious material from the waterD. none of the above
Q11. Both temporary and permanent hardness of water can be removed on boiling water with
A. calcium hydroxideB. sodium carbonateC. calcium oxideD. calcium carbonate
Q12. Temporary hardness of water may be removed by adding
A. calcium hydroxideB. calcium carbonateC. calcium chlorideD. sodium bicarbonate
Q13. When temporary hard water is boiled, one of the substances formed is
A. calcium bicarbonateB. calcium sulfateC. hydrogen chlorideD. carbon dioxide
Q14. Maximum permissible velocity 1.5 m/sec, is adopted in drains
A. with beds of rocks and gravelsB. lined with stonesC. both (a) and (b)D. neither (a) nor (b).
Q15. The moisture content of a sludge is reduced from 90% to 80% in a sludge digestion tank. The percentage decrease in the volume of sludge, is
A. 25%B. 50%C. 10%D. 5%.
Q16. The factor responsible for purification of sewage in river is
A. HydrologyB. Dissolved oxygen in waterC. TemperatureD. TurbulenceE. All the above.
Q17. In the activated sludge process
A. aeration is continued till stabilityB. aeration is done with an admixture of previously aerated sludgeC. sludge is activated by constant stirringD. water is removed by centrifugal action.
Q18. The Brake Horse power of the motor (efficiency 60%) required for a pump of capacity 0.075 cumec for a total lift of 12 m, is
A. 10B. 15C. 20D. 25
Q19. For detecting the nitrates in sewage, the colour may be developed by adding
A. Pottassium permanganateB. Sulphuric acid and napthamineC. Phenol-di-sulphuric acid and pottassium hydroxideD. None of these.
Q20. The drop man holes are generally provided in sewers for
A. industrial areasB. large town shipsC. hilly town shipsD. cities in plains.
Q21. In sewers the gas generally found, is
A. Hydrogen sulphide (H2S)B. Carbon dioxide (CO2)C. Methane (CH4)D. Petrol vapoursE. All the above.
Q22. During preliminary treatment of a sewage
A. Oil and grease are removed from skimming tanksB. Floating materials are removed by screeningC. Girt and sand are removed by girt chambersD. All the above.
Q23. Application of quaternary ammonium compounds as sanitizing agents tends to
A. favor gram positive bacteriaB. decrease gram positive bacteriaC. increase the percentage of gram(-)ve rods on utensilsD. none of the above
Q24. Sanitizers used for rubber made equipments are
A. strong acidsB. strong alkalisC. combination of bothD. none of these
Q25. Biological oxidation processes usually referred as biological treatment, are the most common form of
A. primary treatmentB. secondary treatmentC. tertiary treatmentD. all of these
Q26. From the following sanitizers which one comes under category of surface active agents?
A. Tetra phosphateB. TeepolC. Meta phosphateD. None of these
Q27. The methods used for biological treatment are
A. lagoonB. activated sludge processC. oxidation ditchesD. all of these