lab midterm

Which of the following is/are considered therapeutic gases?
a. O2
b. O2–NO mixture
c. O2–He mixture
d. N2O

a.1 and 2
b.2 and 4
c.3 and 4
d.1, 2, and 3

What is the fire-risk classification of N and CO2?

a. flammable
b. supports combustion
c. inflammable
d. nonflammable

Which of the following medical gases support combustion?

1. O2
2. N2O
3. compressed air
3. CO2

a.1 and 4
b.2 and 3
c.1, 2, and 3
d.1, 3, and 4

Which of the following statements regarding O2 is false?

a. It is only slightly soluble in water.
b. It is odorless and transparent.
c. It is flammable.
d. It is heavier than air.

What factors affect the combustion-supporting properties of O2?

1. concentration
2. partial pressure
3. humidity

a.1
b.2
c.1 and 2
d.1, 2, and 3

By what means is air for medical use in a hospital most commonly produced?

a. chemical decomposition
b. electrolysis
c. fractional distillation
d. physical separation

What is the most common and least expensive method for commercial production of O2?

a. electrolysis of water
b. fractional distillation of air
c. physical separation by molecular sieves
d. chemical decomposition of sodium chlorate

What is the U.S. Food and Drug Administration (FDA) purity standard for O2?

a.21%
b.90%
c.95%
d.99%

Which of the following methods of producing O2 is commonly used in the home care setting?

a.chemical decomposition
b.electrolysis
c.fractional distillation
d.physical separation

Components of a large medical air compressor include which of the following?

1. drying system
2. diaphragm or turbine
3. reservoir tank
4. pressure-reducing valve

a. 2 and 3
b. 2 and 4
c. 1, 2, and 3
d. 1, 3, and 4

Air for medical use in a hospital should be which of the following?

1. particle-free
2. oil-free
3. dry

a. 1 and 2
b. 1 and 3
c. 2 and 3
d. 1, 2, and 3

Large hospital air compressor systems must be capable of maintaining 50 pounds per square inch gauge (psig) at what flows?

a. 10 L/min
b. 15 L/min
c. 50 L/min
d. 100 L/min

Which of the following equipment could be powered by a small diaphragm or turbine air compressor?

1. small-volume medication nebulizer
2. all-purpose large-volume jet nebulizer
3. intermittent positive-pressure breathing device

a.1
b.1 and 2
c.2 and 3
d.1, 2, and 3

Which of the following statements about CO2 is FALSE?

a.It does not support animal life.
b.It is a flammable gas.
c.It is odorless and colorless.
d.It is heavier than air.

Which of the following statements about He is false?

a.It is an inert gas.
b.It is odorless.
c.It is nonflammable.
d.It is heavier than air.

What key property of He makes it useful as a therapeutic gas?

a.low solubility
b.chemical inertness
c.low cost
d.low density

Which of the following gases is used to treat conditions causing hypoxic respiratory failure?

a. N2O
b. He
c. NO
d. Cyclopropane

Compressed gas cylinders are manufactured from which of the following?

a.copper or brass
b.seamless steel
c.seamless aluminum
d.fiberglass

Department of Transportation (DOT) regulations require compressed gas cylinders to be hydrostatically tested for leaks and expansion every how often?

a.1 to 2 years
b.3 to 5 years
c.6 to 8 years
d.5 to 10 years

During inspection of the shoulder of a compressed gas cylinder, you note a plus sign (+) next to the test date. This indicates what about the cylinder?

a.It is made of spun aluminum, not steel.
b.It only requires a 10-year DOT inspection.
c.It can be filled to 10% above its service pressure.
d.It has a high coefficient of elastic expansion.

According to the U.S. Department of Commerce, a gas cylinder that is color coded blue should contain which of the following?

a.air
b.He
c.N2O
d.O2

According to the National Institute of Standards and Technology of the U.S. Department of Commerce, a gas cylinder that is color-coded brown and green should contain which of the following?

a.O2–N2 mixture
b.O2–CO2 mixture
c.CO2
d.O2–He mixture

In clinical practice, how is a positive identification made of the contents of a medical gas cylinder?

a.noting the color of the cylinder
b.inspecting the cylinder threads
c.reading the cylinder label
d.collecting and analyzing a gas sample

What is the key difference between small compressed gas cylinders (sizes AA to E) and their larger counterparts (sizes F to K)?

a.Small gas cylinders do not undergo regular DOT testing.
b.Small gas cylinders are always filled to lower pressures.
c.Small gas cylinders cannot be used for anesthetic gases.
d.Small gas cylinders use a yoke (not threaded) connector.

Which of the following mechanisms do all compressed gas cylinders use to avoid excessively high buildup of cylinder pressure?

a.internal convection cooling mechanism
b.pressure-relief mechanism on the valve stem
c.automatic cylinder breech mechanism
d.pressure-relief mechanism on the cylinder body

Which of the following medical gases can be stored in cylinders as liquids at room temperature?

1. CO2
2. O2
3. N2O

a.1
b.1 and 2
c.1 and 3
d.1, 2, and 3

Cylinders of liquid gases are filled according to what specification?

a.filling density
b.critical weight
c.elastic expansion
d.filling pressure

The measured pressure in a liquid-filled cylinder is equivalent to which of the following?

a.the force necessary to compress its volume within the cylinder
b.its filling density divided by the cylinder gas factor
c.the pressure of the surface vapor at any given temperature
d.the weight of the liquid divided by the density of water

The measured pressure in a gas-filled cylinder is equivalent to which of the following?

a.its filling density divided by the cylinder gas factor
b.gas temperature times its coefficient of expansion
c.gas density divided by the density of air at standard temperature, standard pressure, dry (STPD)
d.the force required to compress its volume within the cylinder

When full, a gas cylinder registers a pressure of 2200 psig. After a few hours of use, the pressure gauge reads 550 psig. The cylinder is now how full?

a.one half
b.one third
c.one fourth
d.two thirds

What is the usual method of monitoring the remaining contents in a gas-filled cylinder?

a.Weigh the cylinder.
b.Read the pressure gauge.
c.Compute the gas density.
d.Read the cylinder label.

To accurately determine the remaining contents of a liquid-filled CO2 cylinder, what would you do?

a.Multiply the pressure by the cylinder factor.
b.Divide the pressure by the cylinder factor.
c.Weigh the contents of the cylinder.
d.Empty the cylinder while timing its flow.

A cylinder of N2O has a gauge pressure of 750 psig when full. What will be the pressure in this cylinder when it is half full?

a.375 psig
b.750 psig
c.1500 psig
d.2200 psig

Under what conditions will the gauge pressure of a cylinder of N2O accurately represent its contents?

1. when the liquid in the cylinder has completely vaporized
2. when the ambient temperature exceeds the critical temperature
3. when the filling density is less than 1.0 (water-filled)

a.1 and 2
b.1 and 3
c.2
d.1, 2, and 3

One cubic foot of any gas is equivalent to how many liters of gas?

a.1.00
b.3.79
c.7.48
d.28.30

What cylinder factor is used to compute the duration of flow for a 244 cu/ft (H/K) O2 or air cylinder?

a.0.16
b.0.28
c.3.14
d.2.41

What cylinder factor is used to compute the duration of flow for a 22 cu/ft O2 or air E cylinder?

a.0.28
b.1.34
c.2.41
d.3.14

The gauge on an H cylinder of O2 reads 2000 psig. About how long would the contents of this cylinder last, until completely empty, at a flow of 6 L/min?

a.1 hour 30 minutes
b.17 hours 30 minutes
c.18 hours 10 minutes
d.21 hours 50 minutes

The gauge on a G cylinder of O2 reads 400 psig. About how long would the contents of this cylinder last, until completely empty, at a flow of 5 L/min?

a.2 hours 40 minutes
b.3 hours 10 minutes
c.4 hours 30 minutes
d.9 hours 15 minutes