G-22 FDNY 50+ (Updated for 2026) Exam Prep Pack A+ Questions & Verified
Answers
PART 1: General Knowledge & Certificate Requirements (Questions 1-20)
1. The FDNY G-22 Certificate of Fitness is required for individuals who:
A) Supervise electrical wiring work
B) Supervise the use of LPG or CNG at temporary worksites or events
C) Install sprinkler systems
D) Operate elevators
Answer: B
Rationale: The G-22 certificate authorizes supervision of portable LPG or CNG use
for heating, cooking, or demonstration purposes at temporary worksites and
events .
2. Liquefied Petroleum Gas (LPG) is primarily composed of:
A) Methane and ethane
B) Propane and butane
,C) Carbon dioxide and nitrogen
D) Hydrogen and oxygen
Answer: B
Rationale: LPG mainly consists of propane and butane gases stored under
pressure in liquid form. Propane is the most common LPG in the US .
3. Compressed Natural Gas (CNG) is primarily composed of:
A) Methane
B) Propane
C) Butane
D) Ethylene
Answer: A
Rationale: CNG is composed mainly of methane, which is stored under high
pressure but not liquefied .
,4. The main fire hazard associated with LPG and CNG is:
A) Toxicity
B) Flammability and explosion potential
C) Corrosiveness
D) Radiation
Answer: B
Rationale: LPG and CNG are highly flammable and can cause explosions when
mixed with air and ignited. This is their primary hazard .
5. LPG is heavier than air and will:
A) Accumulate in low-lying areas
B) Rise to the ceiling
C) Evaporate quickly
D) Disperse harmlessly
, Answer: A
Rationale: LPG vapor is denser than air, causing it to settle in low-lying areas such
as basements, pits, and floor drains, creating an explosion hazard .
6. How does CNG behave when released compared to air?
A) Heavier than air, accumulates near ground
B) Lighter than air, disperses quickly
C) Same density as air, mixes evenly
D) Explodes immediately upon leak
Answer: B
Rationale: CNG (methane) is lighter than air and tends to disperse upward,
reducing but not eliminating risk. This is a key difference from LPG .
7. The expansion ratio of LPG when vaporizing from liquid to gas at 70°F is
approximately:
Answers
PART 1: General Knowledge & Certificate Requirements (Questions 1-20)
1. The FDNY G-22 Certificate of Fitness is required for individuals who:
A) Supervise electrical wiring work
B) Supervise the use of LPG or CNG at temporary worksites or events
C) Install sprinkler systems
D) Operate elevators
Answer: B
Rationale: The G-22 certificate authorizes supervision of portable LPG or CNG use
for heating, cooking, or demonstration purposes at temporary worksites and
events .
2. Liquefied Petroleum Gas (LPG) is primarily composed of:
A) Methane and ethane
B) Propane and butane
,C) Carbon dioxide and nitrogen
D) Hydrogen and oxygen
Answer: B
Rationale: LPG mainly consists of propane and butane gases stored under
pressure in liquid form. Propane is the most common LPG in the US .
3. Compressed Natural Gas (CNG) is primarily composed of:
A) Methane
B) Propane
C) Butane
D) Ethylene
Answer: A
Rationale: CNG is composed mainly of methane, which is stored under high
pressure but not liquefied .
,4. The main fire hazard associated with LPG and CNG is:
A) Toxicity
B) Flammability and explosion potential
C) Corrosiveness
D) Radiation
Answer: B
Rationale: LPG and CNG are highly flammable and can cause explosions when
mixed with air and ignited. This is their primary hazard .
5. LPG is heavier than air and will:
A) Accumulate in low-lying areas
B) Rise to the ceiling
C) Evaporate quickly
D) Disperse harmlessly
, Answer: A
Rationale: LPG vapor is denser than air, causing it to settle in low-lying areas such
as basements, pits, and floor drains, creating an explosion hazard .
6. How does CNG behave when released compared to air?
A) Heavier than air, accumulates near ground
B) Lighter than air, disperses quickly
C) Same density as air, mixes evenly
D) Explodes immediately upon leak
Answer: B
Rationale: CNG (methane) is lighter than air and tends to disperse upward,
reducing but not eliminating risk. This is a key difference from LPG .
7. The expansion ratio of LPG when vaporizing from liquid to gas at 70°F is
approximately:
