MED GAS THERAPY EXAM
REVIEW CORRECT 100%
Which of the following medical gases support combustion?
I. O2
II. N2O
III. compressed air
IV. CO2 - ANSWER C) I, II, and III
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. - ANSWER C) It is flammable.
By what means is oxygen for medical use in a hospital most commonly produced?
A) chemical decomposition
B) electrolysis
C) fractional distillation
D) physical separation - ANSWER C) fractional distillation
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 - ANSWER B) fractional distillation of air
What is the U.S. Food and Drug Administration (FDA) purity standard for O2?
A) 21%
B) 90%
C) 95%
D) 99% - ANSWER 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 - ANSWER D) physical separation
Air for medical use in a hospital should be which of the following?
I. particle-free
II. oil-free
, III. dry - ANSWER D) I, II, and III
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. - ANSWER B) It is a flammable gas.
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. - ANSWER D) It is heavier than air.
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 - ANSWER D) 50 psig
Why are zone valves incorporated into a hospital's central gas piping systems? -
ANSWER I. to terminate O2 delivery to an area in case of fire
II. to allow selective maintenance without shutting the system down
What is the primary purpose of indexed connector systems? - ANSWER to prevent
inadvertent misconnections between equipment
What is the indexed safety system for threaded high-pressure connections between
large compressed gas cylinders and their attachments? - ANSWER American Standard
Safety System (ASSS)
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 - ANSWER B) 2 and 5
Where do respiratory therapists typically find DISS connections? - ANSWER I. at the
outlets of pressure-reducing valves attached to cylinders
III. at the station outlets of central piping systems IV. at the inlets of blenders,
flowmeters, ventilators, and other pneumatic equipment
What device is used to reduce the pressure and control the flow of a compressed
medical gas?
REVIEW CORRECT 100%
Which of the following medical gases support combustion?
I. O2
II. N2O
III. compressed air
IV. CO2 - ANSWER C) I, II, and III
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. - ANSWER C) It is flammable.
By what means is oxygen for medical use in a hospital most commonly produced?
A) chemical decomposition
B) electrolysis
C) fractional distillation
D) physical separation - ANSWER C) fractional distillation
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 - ANSWER B) fractional distillation of air
What is the U.S. Food and Drug Administration (FDA) purity standard for O2?
A) 21%
B) 90%
C) 95%
D) 99% - ANSWER 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 - ANSWER D) physical separation
Air for medical use in a hospital should be which of the following?
I. particle-free
II. oil-free
, III. dry - ANSWER D) I, II, and III
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. - ANSWER B) It is a flammable gas.
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. - ANSWER D) It is heavier than air.
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 - ANSWER D) 50 psig
Why are zone valves incorporated into a hospital's central gas piping systems? -
ANSWER I. to terminate O2 delivery to an area in case of fire
II. to allow selective maintenance without shutting the system down
What is the primary purpose of indexed connector systems? - ANSWER to prevent
inadvertent misconnections between equipment
What is the indexed safety system for threaded high-pressure connections between
large compressed gas cylinders and their attachments? - ANSWER American Standard
Safety System (ASSS)
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 - ANSWER B) 2 and 5
Where do respiratory therapists typically find DISS connections? - ANSWER I. at the
outlets of pressure-reducing valves attached to cylinders
III. at the station outlets of central piping systems IV. at the inlets of blenders,
flowmeters, ventilators, and other pneumatic equipment
What device is used to reduce the pressure and control the flow of a compressed
medical gas?
