ENGINEERING CHEMISTRY UNIT- I

21 flashcards · Other · by Vignesh Kumar Palanisamy

1. Turbidity of raw water is a measure of

   Suspended soilds

2. The process of passing water through beds of granular materials, is called

   Filtration

3. To control the growth of algae in reservoirs, the compound which is used, is

   Copper Sulphate

4. The main disadvantage of hard water, is

   a) Scaling of boilers, Greater soap consumption b) Corrosion and incrustation of pipes

5. Mostly used coagulant, is

   Alum

6. The maximum permissible hardness for public supplies is

   115 mg/liter

7. Hardness of water can be removed by boiling if it is due to

   Ca(HCO)3 Calcium bicarbonate

8. Hardness of water is caused by

   Presence of chlorides, sulphates, bicarbonates of Ca, Mg in water

9. Permanent hardness of water can be removed by

   Zeolite process

10. When temporary hard water is boiled, one of the substances formed is

    Carbon-di-oxide

11. Calgon is used for removal of

    Permanent Hardness of water

12. The maximum desirable limit (BIS) of mercury in the drinking water is

    0.001 mg/l

13. According to BIS the maximum permissible limit of dissolved solids in drinking water is

    2000 mg/l

14. Zeolite softening process removes

    Both temporary and permanent hardness of water

15. The chemical oxygen demand (COD) measures the

    Amount of oxygen that would be removed from the water in order to oxidize pollution

16. Substance used in colloidal conditioning is

    Agar agar

17. Reverse Osmosis is otherwise called as

    Super Filtration

18. Reverse Osmosis is the process of flow of solvent from

    High to low

19. Carbonate conditioning is used in

    low pressure boiler

20. Calgon is

    Sodium Hexa meta phosphate

21. Temporary hardness is otherwise called as

    Alkaline Hardness