What is considered a good vacuum level for a deep vacuum?
A) 100 microns B) 500 microns C) 28 in Hg vacuum D) 1,000 microns
B
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A frost-free hydrant, hose, and ____ is the least costly watering system to install.
A. bucket B. rubber tire C. automatic waterers D. trough
Fill is placed and compacted in multiple layers called _____.
a. strata b. flights c. panels d. lifts
What is the purpose of shutoff valves in the water loop of a water-source heat pump?
A) They are used to shut off different loop zones in a zoned loop system. B) They allow water pressure to build. C) They keep water inside the piping system. D) They allow you to service a water-source unit.
Some isometric drawings can be developed with more detail if both of the construction lines are drawn at what degrees from the horiziontal.
A. 180 B. 90 C. 60 D. 30