An advantage of using galvanized sheet metal over other materials when assembling a duct system is it _____.

a. is very quiet
b. is resistant to corrosion
c. is the least expensive
d. exhibits the lowest heat loss


b. is resistant to corrosion

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A force field that acts on some materials, but not others, is called ____.

a. electricity b. current c. compass d. magnetism

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The temperature of the water returning to a chiller used for comfort cooling is typically about _____.

a. 35°F (2°C) b. 45°F (7°C) c. 55°F (13°C) d. 65°F (18°C)

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An SSOLR initiates a trip if the phase currents exceed what percentage of the trip current dial setting?

a. 80% b. 100% c. 125% d. 150%

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Subsurface drains have been made by all of the following materials EXCEPT ____

a. clay b. lead c. concrete d. plastic

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