CT Medical Gas Piping Contractor
Exam Questions And Correct Answers
(Verified Answers) Plus Rationales 2026
Q&A| Instant Download Pdf
1. Which medical gas is commonly used for anesthesia?
A. Oxygen
B. Nitrogen
C. Nitrous Oxide
D. Carbon Dioxide
Answer: Nitrous Oxide
Rationale: Nitrous oxide is a common anesthetic gas used in medical
procedures for its sedative and analgesic properties.
2. What is the primary purpose of a medical gas pipeline system?
A. Provide ventilation
B. Supply electricity
C. Deliver medical gases safely to patient care areas
D. Maintain hospital water pressure
Answer: Deliver medical gases safely to patient care areas
Rationale: Medical gas pipeline systems are specifically designed to safely
transport gases such as oxygen, nitrous oxide, and vacuum throughout
healthcare facilities.
3. Which color typically identifies oxygen piping in a medical facility?
A. Yellow
B. Green
, C. Green
D. White
Answer: Green
Rationale: In the United States, oxygen piping is commonly color-coded
green according to NFPA and CGA standards.
4. What device is used to regulate the pressure of medical gases to
bedside outlets?
A. Pressure gauge
B. Flowmeter
C. Pressure regulator
D. Vacuum pump
Answer: Pressure regulator
Rationale: Pressure regulators reduce and maintain the appropriate
pressure for safe delivery of gases at outlets.
5. Which of the following is a vacuum medical gas?
A. Oxygen
B. Nitrous Oxide
C. Medical Air
D. Nitrogen
Answer: Medical Air
Rationale: Medical air is a clean, compressed air supply used for
respiratory therapy and as a source for certain anesthesia delivery systems.
6. How often should medical gas pipeline systems be tested for leaks
according to NFPA 99?
A. Daily
B. Monthly
C. Annually
D. During installation and every 12 months
Answer: During installation and every 12 months
Rationale: NFPA 99 requires initial verification of system integrity and
annual testing to ensure safety and compliance.
, 7. What is the main function of a zone valve in medical gas systems?
A. Measure gas purity
B. Isolate sections of the pipeline
C. Mix gases
D. Filter impurities
Answer: Isolate sections of the pipeline
Rationale: Zone valves allow individual areas of a facility to be shut off
without affecting the entire system.
8. Which gas is primarily used for life support in hospitals?
A. Nitrous Oxide
B. Oxygen
C. Carbon Dioxide
D. Nitrogen
Answer: Oxygen
Rationale: Oxygen is essential for patient care and life support, making it
the most critical medical gas.
9. What is the recommended material for medical gas piping?
A. PVC
B. Copper
C. CDA 606 or ASTM B819 copper
D. Steel
Answer: CDA 606 or ASTM B819 copper
Rationale: Specific types of copper are used to prevent contamination,
corrosion, and ensure system longevity.
10. Which medical gas system component removes moisture from
compressed gas?
A. Filter
B. Pressure gauge
C. Drier/Desiccant
D. Regulator
Exam Questions And Correct Answers
(Verified Answers) Plus Rationales 2026
Q&A| Instant Download Pdf
1. Which medical gas is commonly used for anesthesia?
A. Oxygen
B. Nitrogen
C. Nitrous Oxide
D. Carbon Dioxide
Answer: Nitrous Oxide
Rationale: Nitrous oxide is a common anesthetic gas used in medical
procedures for its sedative and analgesic properties.
2. What is the primary purpose of a medical gas pipeline system?
A. Provide ventilation
B. Supply electricity
C. Deliver medical gases safely to patient care areas
D. Maintain hospital water pressure
Answer: Deliver medical gases safely to patient care areas
Rationale: Medical gas pipeline systems are specifically designed to safely
transport gases such as oxygen, nitrous oxide, and vacuum throughout
healthcare facilities.
3. Which color typically identifies oxygen piping in a medical facility?
A. Yellow
B. Green
, C. Green
D. White
Answer: Green
Rationale: In the United States, oxygen piping is commonly color-coded
green according to NFPA and CGA standards.
4. What device is used to regulate the pressure of medical gases to
bedside outlets?
A. Pressure gauge
B. Flowmeter
C. Pressure regulator
D. Vacuum pump
Answer: Pressure regulator
Rationale: Pressure regulators reduce and maintain the appropriate
pressure for safe delivery of gases at outlets.
5. Which of the following is a vacuum medical gas?
A. Oxygen
B. Nitrous Oxide
C. Medical Air
D. Nitrogen
Answer: Medical Air
Rationale: Medical air is a clean, compressed air supply used for
respiratory therapy and as a source for certain anesthesia delivery systems.
6. How often should medical gas pipeline systems be tested for leaks
according to NFPA 99?
A. Daily
B. Monthly
C. Annually
D. During installation and every 12 months
Answer: During installation and every 12 months
Rationale: NFPA 99 requires initial verification of system integrity and
annual testing to ensure safety and compliance.
, 7. What is the main function of a zone valve in medical gas systems?
A. Measure gas purity
B. Isolate sections of the pipeline
C. Mix gases
D. Filter impurities
Answer: Isolate sections of the pipeline
Rationale: Zone valves allow individual areas of a facility to be shut off
without affecting the entire system.
8. Which gas is primarily used for life support in hospitals?
A. Nitrous Oxide
B. Oxygen
C. Carbon Dioxide
D. Nitrogen
Answer: Oxygen
Rationale: Oxygen is essential for patient care and life support, making it
the most critical medical gas.
9. What is the recommended material for medical gas piping?
A. PVC
B. Copper
C. CDA 606 or ASTM B819 copper
D. Steel
Answer: CDA 606 or ASTM B819 copper
Rationale: Specific types of copper are used to prevent contamination,
corrosion, and ensure system longevity.
10. Which medical gas system component removes moisture from
compressed gas?
A. Filter
B. Pressure gauge
C. Drier/Desiccant
D. Regulator
