You design an air-entrainment system that mixes air with O2 at a fixed ratio of 1:7. Approxi-mately what O2 concentration will this device provide?
a. 33%
b. 40%
c. 80%
d. 90%
ANS: D
Table 41-7 lists the approximate air-to-O2 ratios for several common O2 percentages.
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Fill in the blank(s) with correct word
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A. 100 B. 400 C. 800 D. 1600
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