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Moe.S Moe.S
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6 years ago
When using a brazing flux, it should be applied _____.
 
  a. only to the tube end
  b. to both the tube end and the fitting cup
  c. only to the fitting cup
  d. both before and after the brazing process

 Q. 2

What is the purpose of excess air in furnace combustion?
 
  A) Excess air improves the draft efficiency by raising the combustion gas temperature
  B) Excess air is used for creating a high fire second stage of combustion
  C) Excess air insures that the heat exchanger does not overheat
  D) Excess air insures that all the gas is burned by making sure there is plenty of oxygen available.
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letsdothis545letsdothis545
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6 years ago
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Moe.S Author
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#2
6 years ago
Thank you

Can you answer the others that I've posted too? Face with Cold Sweat
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#3
6 years ago
I'll take a quick look at them
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