To ensure protection against backflow, hose bibbs are required to include _____
a. air gaps
b. check valves
c. vacuum breakers
d. flexible water lines
c
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One degree approximates ____ radian.
A. 0.017 B. 0.020 C. 0.035 D. 0.085
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?What may need to be done to the root surface of a weld that is prepared on both sides before the next weld pass(es)?
A. ?ground or gouged clean B. ?sanded smooth C. ?Re-tack welded D. ?Nothing, it will be on the back anyway
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Which of the following terms is used as a metric measurement of heat energy?
a.BTUs b.joules c.watts d.farads
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What percentage of ethylene glycol is commonly used for a solid-ice brine-coil system?
A) 25% B) 75% C) 50% D) 10%
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