lab 2

40. The gauge on an E cylinder of O2 reads 800 psig. About how long would the contents of this cylinder last, until completely empty, at a flow of 3 L/min?
a. 1 hour 15 minutes
b. 1 hour 45 minutes
c. 2 hours 10 minutes
d. 2 hours 40 minutes

You are planning a patient transport that will take about 1 hours. The patient requires manual ventilation with 10 L/min of O2. What is the minimum number of full E cylinders you would take with you?
a. 2
b. 3
c. 4
d. 5

One cu/ft of liquid O2 is the equivalent of about how many cu/ft of gaseous O2?
a. 28
b. 244
c. 360
d. 860

Compared to portable cylinders, a centrally located, piped-in bulk O2 system has which of the following advantages?
1. no need for a backup or reserve system
2. more convenient and less hazardous than cylinders
3. oxygen already reduced to its working pressure
4. less risk of the O2 supply being depleted
a. 1, 2, and 3
b. 2 and 4
c. 3 and 4
d. 2, 3, and 4

Which of the following components are common to a standard compressed gas cylinder manifold system?
1. automatic switch-over control
2. pressure-reducing valves
3. primary and reserve bank
4. alarm system
a. 1, 2, and 3
b. 2 and 4
c. 3 and 4
d. 1, 2, 3, and 4

Unlike CO2 or N2O, O2 cannot be stored as a liquid at room temperature but must be kept in special cryogenic containers. Why is this so?
a. O2 is 20 times less diffusible than CO2, N2O, or cyclopropane.
b. O2 has a critical temperature well below room temperature.
c. O2 has an extremely high gas solubility coefficient.
d. O2 has a boiling point below well below room temperature.

What do the components of a liquid O2 bulk storage tank include?
1. inner and outer steel shells, separated by a vacuum
2. safety system that vents O2 if warming occurs
3. vaporizer system that converts liquid O2 to gas
4. pressure-reducing valves to lower pressure to 50 psig
a. 1, 2, and 3
b. 2 and 4
c. 1, 2, 3, and 4
d. 3 and 4

The NFPA standard for bulk liquid O2 systems requires that the reserve supply be which of the following?
a. fixed cylinder bank of 75 H cylinders
b. at least one large liquid O2 cylinder
c. equal to the average gas use of 1 day
d. at least 3000 cu/ft of gaseous O2

Structural requirements for the central piping systems that are used in hospitals to distribute gases are established by whom?
a. American National Standards Institute (ANSI)
b. Department of Transportation
c. National Fire Protection Association (NFPA)
d. Compressed Gas Association (CGA)

The pressure of O2 or air in a bulk supply system is reduced to what standard working pressure?
a. 10 psig
b. 14 psig
c. 25 psig
d. 50 psig

Why are zone valves incorporated into a hospital's central gas piping systems?
1. to terminate O2 delivery to an area in case of fire
2. to allow selective maintenance without shutting the system down
3. to allow variable pressure reduction throughout the system
a. 1 and 2
b. 1 and 3
c. 2 and 3
d. 1, 2, and 3

What is the primary purpose of indexed connector systems?
a. to prevent inadvertent misconnections between equipment
b. to speed making connections between equipment
c. to allow U.S. equipment to “mate” with foreign equipment
d. to provide universal connections among all equipment

What is the indexed safety system for threaded high-pressure connections between large compressed gas cylinders and their attachments?
a. Pin-Indexed Safety System (PISS)
b. Diameter-Index Safety System (DISS)
c. American Standard Safety System (ASSS)
d. CGA System

Which of the following is false about ASSS standards?
a. They provide specifications for more than 60 gases and mixtures.
b. They apply only to cylinders sizes F through H/K.
c. They apply to high-pressure connections.
d. They provide a separate connector for all gases.

Which of the following statements is FALSE about PISS standards?
a. The exact positions of pins and pinholes do not vary for each gas.
b. In order to work, the yoke nipple has to seat in the recessed valve outlet.
c. They apply only to cylinders using a yoke connection (A?1?E).
d. They have 6 pin positions and 10 possible pin/hole combinations.

What is the PISS index hole position for O2?
a. 1 and 5
b. 2 and 5
c. 1 and 6
d. 4 and 6

What safety system is designed to prevent accidental interchanging among low-pressure (less than 200 psig) connectors such as those found on flowmeters and ventilators?
a. PISS
b. ASSS
c. DISS
d. CGA

Where do respiratory therapists typically find DISS connections?
1. at the outlets of pressure-reducing valves attached to cylinders
2. at the nurse station
3. at the station outlets of central piping systems
4. at the inlets of blenders, flowmeters, ventilators, and other pneumatic equipment
a. 1, 2
b. 1, 2, 3
c. 1, 2, 4
d. 3, 4

You must connect a large-volume nebulizer to a bedside compressed-air outlet through a flowmeter. You have only standard O2 flowmeters available. Which of the following actions is appropriate?
a. Connect the O2 flowmeter to the air outlet with piping tape.
b. Use an O2-to-air DISS adapter to join the flowmeter and outlet.
c. Connect the O2 flowmeter to the air outlet with a petroleum jelly seal.
d. Try to cross-thread an O2 flowmeter directly on the air outlet.

What is the greatest potential problem with quick-connect DISS systems (such as Ohio, NCG, or Puritan)?
a. increased cost of flowmeter equipment
b. decreased accuracy in flowmeter equipment
c. difficulty in training new personal. d.incompatibility among different manufacturers

What device is used to reduce the pressure and control the flow of a compressed medical gas?
a. Bourdon gauge
b. regulator
c. flowmeter
d. reducing valve

If you had to power a ventilator from a large cylinder of compressed gas, which of the following devices would be required?
a. flowmeter
b. regulator
c. reducing valve
d. oxygen blender

If you have to deliver medical gas to a patient from a compressed gas cylinder, which of the following devices would you select to control gas flow?
a. regulator
b. oxygen blender
c. reducing valve
d. flowmeter

A very common application of the adjustable pressure-reducing valve is in combination with which of the following?
a. flow restrictor
b. Thorpe tube flowmeter
c. Bourdon gauge
d. uncompensated flowmeter

How can one determine whether a pressure-reducing valve uses multiple stages for pressure reduction?
a. by noting the number of gauges attached to the valve
b. by noting the DISS code
c. by noting the ASSS code
d. by noting the number of pressure relief vents

When minimal fluctuations in pressure and flow are critical factors, which of the following pressure-reducing valves would be the best choice?
a. single-stage preset pressure-reducing valve
b. multiple-stage pressure-reducing valve
c. uncompensated Thorpe tube flowmeter
d. Bourdon adjustable pressure regulator

To clean a cylinder valve outlet of foreign material, what should you do?
a. Wipe the valve outlet with a light oil.
b. Quickly open, then close, the valve.
c. Blow into the valve outlet a few times.
d. Wipe the valve outlet with an alcohol swab.

When used to control the flow of medical gases to a patient, how is a flow restrictor classified?
a. variable-orifice, constant-pressure flowmeter device
b. fixed-orifice, variable-pressure flowmeter device
c. variable-orifice, variable-pressure flowmeter device
d. fixed-orifice, constant-pressure flowmeter device

Which of the following are advantages of a using a flow restrictor to control the delivery of medical gases to a patient?
1. preset metered flow
2. low cost and simplicity
3. gravity independence
4. wide range of utility
a. 1, 2, and 3
b. 1, 2, and 4
c. 2 and 4
d. 3 and 4

When used to control the flow of medical gases to a patient, how is a Bourdon gauge classified?
a. fixed-orifice, variable-pressure flowmeter device
b. fixed-orifice, constant-pressure flowmeter device
c. variable-orifice, variable-pressure flowmeter device
d. variable-orifice, constant-pressure flowmeter device

You are preparing to conduct a complex transport of a patient receiving O2, and you expect to have to alter O2 flows during the transport. Which of the following devices would best meet your needs?
a. uncompensated Thorpe tube
b. flow restrictor
c. compensated Thorpe tube
d. Bourdon gauge

Which of the following is FALSE about a Bourdon gauge?
a. It is always used with an adjustable high pressure-reducing valve.
b. It actually senses pressure but is calibrated to display flow.
c. It reads a flow higher than actual if downstream pressure increases.
d. It will register zero flow when the outlet is completely blocked.

If you have to deliver O2 to a patient directly from a bedside outlet station, which of the following devices would you select?
a. Thorpe tube flowmeter
b. Bourdon-type gauge
c. pressure-reducing valve
d. medical gas regulator

When used to control the flow of medical gases to a patient, how is a Thorpe tube classified?
a. variable-orifice, constant-pressure flowmeter device
b. fixed-orifice, constant-pressure flowmeter device
c. variable-orifice, variable-pressure flowmeter device
d. fixed-orifice, variable-pressure flowmeter device

Which of the following is TRUE about an uncompensated Thorpe tube?
a. flow lower than actual if downstream pressure increases
b. fixed-orifice, variable-pressure flowmeter device
c. flow-control needle valve placed distal to the flow tube
d. accuracy unaffected by changes in downstream resistance

Which of the following is FALSE about a compensated Thorpe tube?
a. variable-orifice, constant-pressure flowmeter device
b. calibrated in L/min at atmospheric pressure
c. flow-control needle valve placed distal to the flow tube
d. accuracy unaffected by changes in downstream resistance

Which of the following devices would you select if the goal was to accurately meter the flow through a jet nebulizer?
a. Bourdon gauge
b. flow restrictor
c. uncompensated Thorpe tube
d. compensated Thorpe tube

What is the only major factor limiting the use of pressure-compensated Thorpe tube flowmeters?
a. downstream resistance
b. effect of position (gravity)
c. DISS connector availability
d. use with gases other than O2

You are called by a nursing home to help set up O2 for a patient, delivered through a jet nebulizer. Unfortunately, all that is available is an old uncompensated Thorpe tube flowmeter. When set to 8 L/min, the nebulizer creates an additional 30 psig of downstream pressure. About what flow of O2 will the patient now receive?
a. 4 L/min
b. 6 L/min
c. 8 L/min
d. 12 L/min

The needle valve of a flowmeter with a ball and float tube is completely closed. When you plug the flowmeter into a gas source, the float does not move. Which of the following can be concluded?
a. The device is not calibrated at 50 psi.
b. The device is a Bourdon-gauge flowmeter.
c. The device is pressure compensated.
d. The device is affected by gravity.

When using a Bourdon gauge against high outflow resistance, what will the flowmeter reading show?
a. exceed actual flow
b. be less than actual flow
c. equal actual flow
d. equal 50 psi