?____ act as scavengers that combine with contaminants and float to form the slag on top of the weld.

A. ?Carbon and nickel
B. ?Silicon and manganese
C. ?Aluminum and copper
D. ?Sulfur and magnesium


Answer: B

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A direct-fired make-up air unit typically achieves a combustion efficiency of _____.

a. 70 percent b. 80 percent c. 90 percent d. 100 percent

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The U.S. produces more beef than it consumes.

Answer the following statement true (T) or false (F)

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When the outdoor temperature falls below the balance point, an air-to-air heat pump _____

a. must be shut down b. can no longer extract heat from the outside air c. requires supplemental heat d. can produce more heat than the structure requires

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