A constant area duct: (Multiple Choice)

A constant area duct:
 A) maintains forward velocity
  B) decreases pressure for an increase in velocity
  C) increases pressure for a decrease in velocity
  D) none of the above

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Q. 2  A constant area duct:
 A) has an increasing area as gas moves through the duct
  B) has a decreasing area as gas moves through the duct
  C) has an area that remains the same as gas moves through the duct
  D) none of the above

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Q. 3  A venturi tube has an expanding radius that does not exceed:
 A) 5 degrees
  B) 10 degrees
  C) 15 degrees
  D) 20 degrees

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Q. 4  High air flow with oxygen enrichment (HAFOE) masks alter oxygen concentrations by:
  I. changing nozzle size
  II. changing air entrainment port size
  III. changing oxygen liter flow into the mask
  IV. changing air liter flow into the mask
 A) I
  B) I and II
  C) I, II, and III
  D) I, II, III, and IV