Purging refrigerant lines with nitrogen during their installation prevents _____
a. acid formation
b. overheating
c. copper oxide formation
d. corrosion buildup
c
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The term ____________________ refers to removing a rectangular piece of grass and a shallow layer
of the soil beneath it, and moving the two to another location.
Fill in the blank(s) with the appropriate word(s).
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The area of trapezoid is 
where A = area, h = height, and b1 and b2 = bases.
Answer the following statement true (T) or false (F)
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Self sufficiency is a more important factor influencing farm policy in the United States than in Europe
Indicate whether the statement is true or false
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A system using R-404a has an evaporation temperature of 0°F. If the line length is 100 ft. and the system needs a capacity of 2 tons, what size line should be used?
A) 7/8 in B) 3/4 in C) 1-1/8 in D) 5/8 in
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