In the accompanying figure, which scales are to be used for hydrocarbon and carbon monoxide, respectively?
A. Lo, Lo
B. Hi, Lo
C. Lo, Hi
D. Hi, Hi
Answer: C
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What structure carries water and nutrients absorbed by the roots to the leaves?
a. xylem c. flax b. phloem d. nodes
What is a sign that the TEV is “hunting”?
a. High superheat b. Low superheat c. Superheat fluctuation d. Frost on the suction line
Why do heat pumps operate more efficiently than electric furnaces?
A) They use electricity to move heat rather than converting electricity directly to heat B) Heat pumps and electric furnaces actually operate at about the same efficiency C) Refrigerant has a natural affinity for heat D) Heat pumps use a more direct method of converting electrical energy to heat energy
The MSDS is a document that lists safety situations for employees who work in a hazardous job
Indicate whether the statement is true or false