Water and its Treatment Quiz

What is the characteristic of preventing lather formation of water with soap?

• Hardness of water

• Presence of chlorides

• Presence of sulphates

• Presence of bicarbonates

What is the unit of expressing hardness of water?

• Degree Clarke (oCl)

• Degree French (oFr)

• Parts per million (ppm)

• Milligram per liter (mg/L)

What is the main disadvantage of sludge formation in boilers?

• Difficulty in operation

• Poor heat conduction

• Formation of hard scale

• Clogging of pipe lines

What causes scale formation in low pressure boilers?

• Formation of CaCO3

• Formation of Ca(OH)2

• Presence of CaSO4

• Presence of SiO2

How can sludge formation be prevented in boilers?

• Adding more salts to the water

• Increasing water circulation rate

• Removing concentrated salty water

• Using hard water

What is the process of removing common salt from sea water called?

• Reverse osmosis

• Electrodialysis

• Desalination

• Nanofiltration

What is the main disadvantage of using soft water for boilers?

• It causes sludge formation

• It contains suspended impurities

• It may destroy the zeolite

• It may cause corrosion

What is the primary purpose of internal treatment in the boiler feed water?

• To remove dissolved CO2

• To remove scales

• To prevent scale formation

• To remove dissolved oxygen

What is the chemical used for preventing corrosion due to dissolved oxygen in boilers?

• Sodium Sulphite

• Hydrazine

• Sodium hexa meta phosphate

• Ammonium hydroxide

What is the main advantage of the Permutit or Zeolite process for water softening?

• It does not cause sludge formation

• It requires less time for softening

• It can remove any hardness without adjustment

• It can be used for boilers