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An advantage of using fiberglass duct instead of sheet metal is that _____.

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An advantage of using fiberglass duct instead of sheet metal is that _____.

An advantage of using fiberglass duct instead of sheet metal is that _____.

a. fiberglass is heavier than sheet metal
b. fiberglass can be used with only a thin layer of additional insulation
c. fiberglass lowers the air leakage rate
d. all fiberglass duct is flexible

[Ques. 2] Per NFPA 90A , fiberglass duct may be used in systems that operate with a maximum temperature of _____.

a. 100F
b. 150F
c. 200F
d. 250F

[Ques. 3] A carburizing/reducing flame has a white feather created by excess _____.

a. air
b. oxygen
c. acetylene
d. acetone

[Ques. 4] At what point should a brazed joint be washed with a wet rag?

a. As soon as the brazing is done
b. Not until the joint cools to 250F
c. After it has cooled for at least 30 minutes
d. As soon as it cools to 500F

[Ques. 5] When is it acceptable to braze with the acetylene tank lying on its side?

a. If space is limited
b. If the tank is almost empty
c. If the tank is completely full
d. It is never acceptable

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