Why do closed hydronic systems include pressure-relief valves, expansion tanks, and temperature and pressure-limiting devices?
A) Because building codes require certain controls on every system
B) Because the copper piping used in the system requires these measures
C) Because freezing must be prevented and antifreeze may not be added
D) Because water expands and contracts as its temperature changes
D
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All change orders must be _____.
a. updated weekly b. logged daily c. within the intent of the contract d. initiated by the project manager
Steelhead trout can live on both sides of the saltwater gradient
Indicate whether the statement is true or false.
One situation that can make a measurement with a laser inaccurate is measuring to a _____
a. metal surface b. plastic surface c. highly reflective surface d. very dull, matte surface
Technician A says that a buffer should not be run above 2,000 rpm when buffing urethane basecoat/clearcoat. Technician B says that larger buffing pads have a higher edge speed than the smaller ones. Who is correct?
A. Technician A only B. Technician B only C. Both Technicians A and B D. Neither Technician A nor B