Water

Hardness of water is due to the presence of salts of ____________

• Potassium

• Chlorine

• Magnesium

• .Boron

Hardness of water is conventionally expressed in terms of equivalent amount of ---------

• H₂CO₃

• MgCO₃

• CaCO₃

• Na₂ CO₃

If the precipitate formed is soft, loose and slimy, these are __________

•  Sludges

• Scale

• rodent

• All the above

The scales decrease the efficiency of boiler and chances of explosions are also there.

• yes

• no

The phenomenon during which the boiler material becomes brittle due to accumulation of caustic substances is known as ___________

• Foaming

• Priming

• Corrosion

• Caustic embrittlement

Foaming is caused by the formation of ___________

• Acids

• Alcohols

• Oils and Alkalies

• Ketones

The chemical formula of zeolite is ___________

• FeSO₄.7H₂O

• Al₂(SO4)₃.18 H₂O

• Na₂O.Al₂O₃.xSiO₂.yH₂O

• Na₂Al₂O

Natrolite is an example of ___________

• Synthetic zeolite

• Natural zeolite

• Calgon

• Colloid

What is Calgon?

• Potassium hexa meta sulphate

• Magnesium hexa meta phosphate

• Sodium hexa meta phosphate

• Calcium hexa meta sulphate

Which of the following is not used in colloidal conditioning?

• Kerosene

• Tannin

• Agar-agar

• vinegar