Water treatment is necessary to protect the system components ...

[tiara099]

Water treatment is necessary to protect the system components against:
 
  A) Scale, corrosion, and fouling. B) Hypothermia, outgassing, and corrosion.
  C) Freezing, evaporation, and sublimation. D) Fouling, freezing, and evaporating.

Question 2

What is the purpose of excess air in furnace combustion?
 
  A) Excess air is used for creating a high-fire second stage of combustion.
  B) Excess air improves the draft efficiency by raising the combustion gas temperature.
  C) Excess air ensures that all the gas is burned by making sure there is plenty of oxygen available.
  D) Excess air ensures that the heat exchanger does not overheat.

[nicoleclaire22]

Answer to Question 1

A

Answer to Question 2

C

[tiara099]

Excellent

[marict]

Wow, this really help