An O2 delivery device takes separate pressurized air and O2 ...

[roselinechinyere27m]

An O2 delivery device takes separate pressurized air and O2 sources as input, then mixes these gases through a precision valve. What does this describe?
 
  a. O2 blending system
  b. Reservoir system
  c. Air-entrainment system
  d. Low-flow system

Question 2

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

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Answer to Question 1

ANS: A
With a blending system, separate pressurized air and O2 sources are input, and the gases are mixed either manually or with a precision valve (blender).

Answer to Question 2

ANS: D
Table 41-7 lists the approximate air-to-O2 ratios for several common O2 percentages.