FDNY G-22 Certificate of Fitness Exam Prep
2026 | LPG & CNG Use Practice Questions,
Verified Answers & Detailed Rationales |
Instant PDF Download
FDNY G-22 CERTIFICATE OF FITNESS EXAM PREP 2026 LPG & CNG Use Practice
Questions
• Comprehensive study material with 200 verified questions covering all exam
domains for complete preparation
• Detailed EXPERT RATIONALE for each answer to reinforce learning and ensure
mastery of LPG and CNG safety protocols
QUESTION 1
A storage tank containing LPG must be inspected for safety compliance how
often according to FDNY regulations?
A) Every 6 months
B) Every 12 months
C) Every 24 months
D) Every 36 months
E) Only when complaints are filed
CORRECT ANSWER: C) Every 24 months
EXPERT RATIONALE: FDNY G-22 regulations mandate that LPG storage tanks must
undergo safety inspections every 24 months to ensure structural integrity, proper
valving, and compliance with all safety standards. These periodic inspections help
identify potential leaks, corrosion, or mechanical failures before they become
hazardous.
QUESTION 2
What is the primary component of Liquefied Petroleum Gas (LPG)?
,A) Methane and ethane
B) Propane and butane
C) Nitrogen and oxygen
D) Helium and argon
E) Carbon dioxide and water vapor
CORRECT ANSWER: B) Propane and butane
EXPERT RATIONALE: LPG primarily consists of propane (C3H8) and butane (C4H10)
hydrocarbons. These gases liquefy under pressure at relatively modest
temperatures, making them ideal for portable storage and use in residential,
commercial, and industrial applications. The exact ratio varies by region and
season.
QUESTION 3
At what temperature does propane convert from liquid to gas at atmospheric
pressure?
A) -32°F (-36°C)
B) -42°F (-42°C)
C) -52°F (-47°C)
D) -62°F (-52°C)
E) -72°F (-57°C)
CORRECT ANSWER: B) -42°F (-42°C)
EXPERT RATIONALE: Propane has a boiling point of approximately -42°F (-42°C) at
atmospheric pressure. This low boiling point is why propane readily vaporizes and
can be used as a fuel in various applications. Understanding this phase change is
critical for safe handling and storage.
,QUESTION 4
CNG (Compressed Natural Gas) is primarily composed of which gas?
A) Propane
B) Butane
C) Methane
D) Ethane
E) Nitrogen
CORRECT ANSWER: C) Methane
EXPERT RATIONALE: CNG is composed primarily of methane (CH4), which typically
comprises 70-90% of the gas mixture. CNG is compressed to pressures of 3,000-
3,600 PSI for storage in high-pressure cylinders, making it suitable for vehicle fuel
and portable applications.
QUESTION 5
What is the maximum storage pressure for standard CNG cylinders used in
commercial applications?
A) 1,500 PSI
B) 2,250 PSI
C) 3,600 PSI
D) 4,500 PSI
E) 5,000 PSI
CORRECT ANSWER: C) 3,600 PSI
EXPERT RATIONALE: Standard CNG storage cylinders are designed and rated for
maximum working pressures of approximately 3,600 PSI. These high-pressure
vessels must meet DOT (Department of Transportation) specifications and undergo
regular inspection and certification to ensure safe operation.
, QUESTION 6
Which agency certifies and regulates CNG storage cylinders in the United
States?
A) OSHA only
B) EPA only
C) Department of Transportation (DOT)
D) NFPA only
E) Local fire departments only
CORRECT ANSWER: C) Department of Transportation (DOT)
EXPERT RATIONALE: The Department of Transportation (DOT) establishes and
enforces specifications for the manufacture, inspection, testing, and recertification
of CNG storage cylinders. DOT certification ensures that cylinders meet safety
standards and are suitable for storing compressed natural gas.
QUESTION 7
What should be done if a small LPG leak is detected from a tank valve?
A) Tighten the valve immediately with a wrench
B) Apply liquid soap solution and observe for bubbles
C) Ignore it if it stops within a few minutes
D) Ventilate the area and contact a qualified technician
E) Attempt to seal it with epoxy putty
CORRECT ANSWER: D) Ventilate the area and contact a qualified technician
EXPERT RATIONALE: Any LPG leak, regardless of size, must be taken seriously. The
proper response is to evacuate the immediate area, ensure adequate ventilation,
2026 | LPG & CNG Use Practice Questions,
Verified Answers & Detailed Rationales |
Instant PDF Download
FDNY G-22 CERTIFICATE OF FITNESS EXAM PREP 2026 LPG & CNG Use Practice
Questions
• Comprehensive study material with 200 verified questions covering all exam
domains for complete preparation
• Detailed EXPERT RATIONALE for each answer to reinforce learning and ensure
mastery of LPG and CNG safety protocols
QUESTION 1
A storage tank containing LPG must be inspected for safety compliance how
often according to FDNY regulations?
A) Every 6 months
B) Every 12 months
C) Every 24 months
D) Every 36 months
E) Only when complaints are filed
CORRECT ANSWER: C) Every 24 months
EXPERT RATIONALE: FDNY G-22 regulations mandate that LPG storage tanks must
undergo safety inspections every 24 months to ensure structural integrity, proper
valving, and compliance with all safety standards. These periodic inspections help
identify potential leaks, corrosion, or mechanical failures before they become
hazardous.
QUESTION 2
What is the primary component of Liquefied Petroleum Gas (LPG)?
,A) Methane and ethane
B) Propane and butane
C) Nitrogen and oxygen
D) Helium and argon
E) Carbon dioxide and water vapor
CORRECT ANSWER: B) Propane and butane
EXPERT RATIONALE: LPG primarily consists of propane (C3H8) and butane (C4H10)
hydrocarbons. These gases liquefy under pressure at relatively modest
temperatures, making them ideal for portable storage and use in residential,
commercial, and industrial applications. The exact ratio varies by region and
season.
QUESTION 3
At what temperature does propane convert from liquid to gas at atmospheric
pressure?
A) -32°F (-36°C)
B) -42°F (-42°C)
C) -52°F (-47°C)
D) -62°F (-52°C)
E) -72°F (-57°C)
CORRECT ANSWER: B) -42°F (-42°C)
EXPERT RATIONALE: Propane has a boiling point of approximately -42°F (-42°C) at
atmospheric pressure. This low boiling point is why propane readily vaporizes and
can be used as a fuel in various applications. Understanding this phase change is
critical for safe handling and storage.
,QUESTION 4
CNG (Compressed Natural Gas) is primarily composed of which gas?
A) Propane
B) Butane
C) Methane
D) Ethane
E) Nitrogen
CORRECT ANSWER: C) Methane
EXPERT RATIONALE: CNG is composed primarily of methane (CH4), which typically
comprises 70-90% of the gas mixture. CNG is compressed to pressures of 3,000-
3,600 PSI for storage in high-pressure cylinders, making it suitable for vehicle fuel
and portable applications.
QUESTION 5
What is the maximum storage pressure for standard CNG cylinders used in
commercial applications?
A) 1,500 PSI
B) 2,250 PSI
C) 3,600 PSI
D) 4,500 PSI
E) 5,000 PSI
CORRECT ANSWER: C) 3,600 PSI
EXPERT RATIONALE: Standard CNG storage cylinders are designed and rated for
maximum working pressures of approximately 3,600 PSI. These high-pressure
vessels must meet DOT (Department of Transportation) specifications and undergo
regular inspection and certification to ensure safe operation.
, QUESTION 6
Which agency certifies and regulates CNG storage cylinders in the United
States?
A) OSHA only
B) EPA only
C) Department of Transportation (DOT)
D) NFPA only
E) Local fire departments only
CORRECT ANSWER: C) Department of Transportation (DOT)
EXPERT RATIONALE: The Department of Transportation (DOT) establishes and
enforces specifications for the manufacture, inspection, testing, and recertification
of CNG storage cylinders. DOT certification ensures that cylinders meet safety
standards and are suitable for storing compressed natural gas.
QUESTION 7
What should be done if a small LPG leak is detected from a tank valve?
A) Tighten the valve immediately with a wrench
B) Apply liquid soap solution and observe for bubbles
C) Ignore it if it stops within a few minutes
D) Ventilate the area and contact a qualified technician
E) Attempt to seal it with epoxy putty
CORRECT ANSWER: D) Ventilate the area and contact a qualified technician
EXPERT RATIONALE: Any LPG leak, regardless of size, must be taken seriously. The
proper response is to evacuate the immediate area, ensure adequate ventilation,
