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Medical Gas Certification Exam
Actual Exam 2026/2027 | Questions
with Verified Answers | 100% Correct |
Pass Guaranteed
SECTION 1: Codes, Standards, & Definitions
Q1: The primary standard governing the qualification of
medical gas system installers (brazers) is:
A. NFPA 99
B. ASSE 6040
C. CGA G-4.1
D. ASTM B88
Correct Answer: B
Rationale: Code Citation: ASSE Standard 6040, “Professional
Qualification Standard for Medical Gas Systems Installers,” is
the personnel qualification standard that certifies individuals to
braze medical gas piping. Hierarchy: NFPA 99 (A) references
the need for qualified personnel, but ASSE 6040 defines how
they become qualified. CGA G-4.1 (C) covers installation.
ASTM B88 (D) covers tube specifications. Distractor Analysis:
Installers must be ASSE 6040 certified. The other documents are
material or procedural standards.
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Q2: Per NFPA 99 (2024), a Category 1 medical gas system is
defined as:
A. Systems serving only exam rooms
B. Systems where failure is likely to cause major injury or death
C. Systems supporting anesthesia or life-support
D. Systems operating at ≤ 80 psig
Correct Answer: C
Rationale: Code Citation: NFPA 99 (2024), Section 3.3.40.1:
“Category 1 systems are those for which failure is likely to
cause major injury or death of patients or caregivers, typically
supporting anesthesia or life-support.” Safety Principle: These
systems receive the most stringent testing and monitoring
requirements. Distractor Analysis: (A) describes Category 3.
(B) is the consequence, not the definition. (D) is a pressure class,
not risk category.
Q3: The Canadian standard equivalent to NFPA 99 for medical
gas piping is:
A. CSA Z180.1
B. CSA Z305.1
C. CSA B149.1
D. CSA C22.1
Correct Answer: B
Rationale: Code Citation: CSA Z305.1-23 “Non-flammable
medical gas piping systems” is the Canadian adoption that
parallels NFPA 99 Chapter 5. Scope: Covers installation,
materials, and testing. Distractor Analysis: Z180.1 (A) covers
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, 3
compressed breathing air quality. B149.1 (C) is natural gas.
C22.1 (D) is the Canadian Electrical Code.
Q4: Which CGA pamphlet specifies the color coding for
medical gas cylinders?
A. G-4
B. G-4.1
C. G-4.3
D. G-5
Correct Answer: C
Rationale: Code Citation: CGA G-4.3 “Color Marking of
Compressed Gas Cylinders Intended for Medical Use” mandates
the color scheme (e.g., O2 = green, N2O = blue). Safety
Principle: Prevents cross-connection at the source. Distractor
Analysis: G-4 (A) covers oxygen, G-4.1 (B) covers installation,
G-5 (D) covers hydrogen.
Q5: The allowable oxygen concentration at any patient outlet
per NFPA 99 is:
A. 19.0 %
B. 19.5 %
C. 20.5 %
D. 21.0 %
Correct Answer: B
Rationale: Code Citation: NFPA 99 (2024), Section 5.1.3.4.2:
“The minimum oxygen concentration shall be 19.5 % at the
outlet.” Safety Principle: Prevents hypoxia if the system
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, 4
becomes diluted with other gases. Distractor Analysis: 19.0 %
(A) is below safe human threshold. 20.5 % (C) and 21.0 % (D)
are acceptable but not the minimum required.
Q6: Which ASSE standard governs the performance of medical
gas outlet (station outlet) assemblies?
A. ASSE 6010
B. ASSE 6020
C. ASSE 6030
D. ASSE 6040
Correct Answer: B
Rationale: Code Citation: ASSE 6020 “Performance
Requirements for Medical Gas Outlets” defines leakage, flow,
and durability tests. Scope: Applies to manufactured outlet
assemblies. Distractor Analysis: 6010 (A) covers installers,
6030 (C) covers inspectors, 6040 (D) covers brazers.
Q7: The term “medical air” per NFPA 99 must have:
A. ≤ 1 ppm CO and ≤ 500 ppm H2O
B. ≤ 10 ppm CO and ≤ 500 ppm H2O
C. ≤ 10 ppm CO and ≤ 100 ppm H2O
D. ≤ 1 ppm CO and ≤ 100 ppm H2O
Correct Answer: B
Rationale: Code Citation: NFPA 99 (2024), Table 5.1.3.6.1:
Medical air shall contain ≤ 10 ppm CO and ≤ 500 ppm H2O.
Safety Principle: Prevents carbon-monoxide toxicity and
P a g e 4 | 37
Medical Gas Certification Exam
Actual Exam 2026/2027 | Questions
with Verified Answers | 100% Correct |
Pass Guaranteed
SECTION 1: Codes, Standards, & Definitions
Q1: The primary standard governing the qualification of
medical gas system installers (brazers) is:
A. NFPA 99
B. ASSE 6040
C. CGA G-4.1
D. ASTM B88
Correct Answer: B
Rationale: Code Citation: ASSE Standard 6040, “Professional
Qualification Standard for Medical Gas Systems Installers,” is
the personnel qualification standard that certifies individuals to
braze medical gas piping. Hierarchy: NFPA 99 (A) references
the need for qualified personnel, but ASSE 6040 defines how
they become qualified. CGA G-4.1 (C) covers installation.
ASTM B88 (D) covers tube specifications. Distractor Analysis:
Installers must be ASSE 6040 certified. The other documents are
material or procedural standards.
P a g e 1 | 37
, 2
Q2: Per NFPA 99 (2024), a Category 1 medical gas system is
defined as:
A. Systems serving only exam rooms
B. Systems where failure is likely to cause major injury or death
C. Systems supporting anesthesia or life-support
D. Systems operating at ≤ 80 psig
Correct Answer: C
Rationale: Code Citation: NFPA 99 (2024), Section 3.3.40.1:
“Category 1 systems are those for which failure is likely to
cause major injury or death of patients or caregivers, typically
supporting anesthesia or life-support.” Safety Principle: These
systems receive the most stringent testing and monitoring
requirements. Distractor Analysis: (A) describes Category 3.
(B) is the consequence, not the definition. (D) is a pressure class,
not risk category.
Q3: The Canadian standard equivalent to NFPA 99 for medical
gas piping is:
A. CSA Z180.1
B. CSA Z305.1
C. CSA B149.1
D. CSA C22.1
Correct Answer: B
Rationale: Code Citation: CSA Z305.1-23 “Non-flammable
medical gas piping systems” is the Canadian adoption that
parallels NFPA 99 Chapter 5. Scope: Covers installation,
materials, and testing. Distractor Analysis: Z180.1 (A) covers
P a g e 2 | 37
, 3
compressed breathing air quality. B149.1 (C) is natural gas.
C22.1 (D) is the Canadian Electrical Code.
Q4: Which CGA pamphlet specifies the color coding for
medical gas cylinders?
A. G-4
B. G-4.1
C. G-4.3
D. G-5
Correct Answer: C
Rationale: Code Citation: CGA G-4.3 “Color Marking of
Compressed Gas Cylinders Intended for Medical Use” mandates
the color scheme (e.g., O2 = green, N2O = blue). Safety
Principle: Prevents cross-connection at the source. Distractor
Analysis: G-4 (A) covers oxygen, G-4.1 (B) covers installation,
G-5 (D) covers hydrogen.
Q5: The allowable oxygen concentration at any patient outlet
per NFPA 99 is:
A. 19.0 %
B. 19.5 %
C. 20.5 %
D. 21.0 %
Correct Answer: B
Rationale: Code Citation: NFPA 99 (2024), Section 5.1.3.4.2:
“The minimum oxygen concentration shall be 19.5 % at the
outlet.” Safety Principle: Prevents hypoxia if the system
P a g e 3 | 37
, 4
becomes diluted with other gases. Distractor Analysis: 19.0 %
(A) is below safe human threshold. 20.5 % (C) and 21.0 % (D)
are acceptable but not the minimum required.
Q6: Which ASSE standard governs the performance of medical
gas outlet (station outlet) assemblies?
A. ASSE 6010
B. ASSE 6020
C. ASSE 6030
D. ASSE 6040
Correct Answer: B
Rationale: Code Citation: ASSE 6020 “Performance
Requirements for Medical Gas Outlets” defines leakage, flow,
and durability tests. Scope: Applies to manufactured outlet
assemblies. Distractor Analysis: 6010 (A) covers installers,
6030 (C) covers inspectors, 6040 (D) covers brazers.
Q7: The term “medical air” per NFPA 99 must have:
A. ≤ 1 ppm CO and ≤ 500 ppm H2O
B. ≤ 10 ppm CO and ≤ 500 ppm H2O
C. ≤ 10 ppm CO and ≤ 100 ppm H2O
D. ≤ 1 ppm CO and ≤ 100 ppm H2O
Correct Answer: B
Rationale: Code Citation: NFPA 99 (2024), Table 5.1.3.6.1:
Medical air shall contain ≤ 10 ppm CO and ≤ 500 ppm H2O.
Safety Principle: Prevents carbon-monoxide toxicity and
P a g e 4 | 37
