Which of the following reduces water flow and heat transfer:

Iron scale will have which of the following color:

The presence of the acids will cause a ______ in circulating water pH:

More corrosion takes place at ______ places of the equipment with iron parts in air conditioner:

As the temperature increases solubility of salts of scales will:

When oxygen reacts with iron it forms which of the following:

Slime and algae absorb oxygen into the water:

Which of the following not the reason for causes of corrosion:

In addition to reduction in flow and heat transfer  which of the following also damages the equipment:

The deposition of dissolved minerals on equipment surface causes ______:

Hardness minerals are the water soluble compounds of which of the following:

Most scales formed are predominantly contains which of the following: