One cubic foot (1 cu/ft) of liquid O2 equals how many cu/ft of gaseous O2?
a. 22.80
b. 7.48
c. 860.00
d. 3.14
Q. 2 The gauge reading of a 50-lb home liquid O2 system indicates that the cylinder is a third full. What is the approximate duration of flow of this system at 2 L/min?
a. 24 hr
b. 48 hr
c. 72 hr
d. 95 hr
Q. 3 The O2 in the inner reservoir of a home liquid O2 system is maintained at what temperature?
a. 300 F
b. 212 F
c. 0 F
d. 150 F
Q. 4 When not in use, vaporization in a home liquid O2 system maintains the pressure in the container at what range?
a. 10 to 15 psi
b. 45 to 55 psi
c. 80 to 90 psi
d. 20 to 25 psi
Q. 5 When the flow-metering device of a home liquid O2 system is turned on, O2 leaves the container through a vaporizing coil, where it is heated by exposure to which of the following?
a. Hot water
b. Ambient air
c. Electrical energy
d. Ultrasound
Q. 6 At normal liquid cylinder operating pressures, 1 lb of stored liquid O2 equals approximately how many liters of gaseous O2?
a. 860.00
b. 344.00
c. 22.80
d. 7.48
Q. 7 A home care patient receiving long-term O2 therapy at 5 L/min complains that her nondisposable humidifier is not bubbling properly.
Upon inspection of the humidifier, you notice hard white deposits in and around the diffusing element. Which of the following would you recommend to this patient?
a. Stop using the humidifier because there is no need for it at this flow.
b. Replace the device and fill with distilled water, not tap water.
c. Increase the flow at night to help clean out the humidifier.
d. Replace the device and fill with sterile water, not tap water.
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