Each exterior surface of a residence is considered a ____.
A. header
B. portal frame
C. rafter
D. braced wall line
Answer: D
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What is one method of cooling a transformer?
A. place in a tank of refrigerant B. place in an air-conditioned room C. place in a tank of water D. place in a tank of oil
What is the formula for the area of a circle?
a. A = 2 ?r2 c. A = 2 ?r b. A = 2 ?d d. A = ?r2
Uncoated steel nails are called ____ nails.
a.hardened c.bright b.rough d.dull
Why are liquid-line filter driers required for all systems using HFC refrigerant?
A) Because HFC refrigerants often form fluoride crystals inside the system. B) Because the filter drier is also the metering device in newer systems. C) Because the POE oil used with HFC refrigerant is very hygroscopic. D) Because the filter drier also serves as a reservoir for refrigerant.