When retrofitting a CFC or HCFC system with a newer HFC refrigerant, why is the HFC refrigerant charge usually less than the original factory charge?
What will be an ideal response?
Older CFC and HCFC refrigerants are denser than most replacement HFC refrigerants. It does not take as much weight of the newer refrigerants to fill up the same space, so less refrigerant is required.
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Describe gypsum lath.
What will be an ideal response?
An engineer who believes in “save now; play later” wants to retire in 30 years with $2.0 million. At 8% per year interest, the amount the engineer will have to invest each year (starting in year 1) to reach the $2 million goal is closest to:
(a) $17,660 (b) $28,190 (c) $49,350 (d) $89,680
Symptoms of a __________ indicate that excess refrigerant may need to be removed from the system
A. system overcharge B. system undercharge
Polygons are figures with more than ____ angles.
A. two B. three C. four D. five