A-35 Air Compressor COF Exam | Complete
Questions with Correct Answers and Detailed
Rationales - Latest Update 2026/2027
SECTION I: PERMIT REQUIREMENTS & REGULATIONS
Question 1
A FDNY permit is required for any air compressor that compresses air at pressures
above ___ pounds per square inch (psi).
A) 50
B) 100
C) 125
D) 150
Rationale: A FDNY permit is required if a compressor is used to compress any
nonflammable, corrosive, or oxidizing gas, including air, to a pressure exceeding
100 psi. These permits are issued by the Bureau of Fire Prevention .
Question 2
Which of the following air compressor operations does NOT require a FDNY
permit?
A) Compressing air to 120 psi indoors
B) Compressing air to 150 psi in a service station
C) Outdoor air compressing (other than at a fair or festival)
D) Compressing nonflammable gas to 110 psi
Rationale: Outdoor air compressing (other than at a fair or festival) does not
require a FDNY permit. However, indoor air compressing or use at fairs/festivals
does require a permit .
,Question 3
Who issues permits for air compressors that compress air above 100 psi?
A) New York State Department of Labor
B) NYC Department of Buildings
C) Bureau of Fire Prevention
D) NYC Department of Environmental Protection
Rationale: Permits for air compressors compressing air above 100 psi are issued by
the Bureau of Fire Prevention .
Question 4
An air compressor permit is required for compressing which types of gases?
A) Flammable gases only
B) Corrosive gases only
C) Nonflammable, corrosive, or oxidizing gases, including air
D) All gases regardless of type
Rationale: A FDNY permit is required if a compressor is used to compress any
nonflammable, corrosive, or oxidizing gas, including air to a pressure exceeding
100 psi .
Question 5
The A-35 Certificate of Fitness is valid for:
A) 1 year
B) 2 years
C) 3 years
D) 5 years
, Rationale: The A-35 Certificate of Fitness must be renewed every three years.
FDNY will send a renewal notice 90 days before the certificate expires .
SECTION II: TYPES OF AIR COMPRESSORS
Question 6
The different types of air compressors include:
A) Reciprocating, centrifugal, and electric only
B) Reciprocating, centrifugal, rotary, and scroll
C) Reciprocating, electric, and solar
D) Rotary, solar, and steam
Rationale: The different types include reciprocating, centrifugal, rotary, and scroll
compressors. The only real difference between these compressors is the way in
which they compress the air .
Question 7
The most commonly used air compressor is the:
A) Centrifugal air compressor
B) Reciprocating air compressor
C) Rotary air compressor
D) Scroll air compressor
Rationale: The most commonly used air compressor is the reciprocating air
compressor, which uses a piston inside a cylinder to compress air .
Question 8
Air compressors are sometimes called:
Questions with Correct Answers and Detailed
Rationales - Latest Update 2026/2027
SECTION I: PERMIT REQUIREMENTS & REGULATIONS
Question 1
A FDNY permit is required for any air compressor that compresses air at pressures
above ___ pounds per square inch (psi).
A) 50
B) 100
C) 125
D) 150
Rationale: A FDNY permit is required if a compressor is used to compress any
nonflammable, corrosive, or oxidizing gas, including air, to a pressure exceeding
100 psi. These permits are issued by the Bureau of Fire Prevention .
Question 2
Which of the following air compressor operations does NOT require a FDNY
permit?
A) Compressing air to 120 psi indoors
B) Compressing air to 150 psi in a service station
C) Outdoor air compressing (other than at a fair or festival)
D) Compressing nonflammable gas to 110 psi
Rationale: Outdoor air compressing (other than at a fair or festival) does not
require a FDNY permit. However, indoor air compressing or use at fairs/festivals
does require a permit .
,Question 3
Who issues permits for air compressors that compress air above 100 psi?
A) New York State Department of Labor
B) NYC Department of Buildings
C) Bureau of Fire Prevention
D) NYC Department of Environmental Protection
Rationale: Permits for air compressors compressing air above 100 psi are issued by
the Bureau of Fire Prevention .
Question 4
An air compressor permit is required for compressing which types of gases?
A) Flammable gases only
B) Corrosive gases only
C) Nonflammable, corrosive, or oxidizing gases, including air
D) All gases regardless of type
Rationale: A FDNY permit is required if a compressor is used to compress any
nonflammable, corrosive, or oxidizing gas, including air to a pressure exceeding
100 psi .
Question 5
The A-35 Certificate of Fitness is valid for:
A) 1 year
B) 2 years
C) 3 years
D) 5 years
, Rationale: The A-35 Certificate of Fitness must be renewed every three years.
FDNY will send a renewal notice 90 days before the certificate expires .
SECTION II: TYPES OF AIR COMPRESSORS
Question 6
The different types of air compressors include:
A) Reciprocating, centrifugal, and electric only
B) Reciprocating, centrifugal, rotary, and scroll
C) Reciprocating, electric, and solar
D) Rotary, solar, and steam
Rationale: The different types include reciprocating, centrifugal, rotary, and scroll
compressors. The only real difference between these compressors is the way in
which they compress the air .
Question 7
The most commonly used air compressor is the:
A) Centrifugal air compressor
B) Reciprocating air compressor
C) Rotary air compressor
D) Scroll air compressor
Rationale: The most commonly used air compressor is the reciprocating air
compressor, which uses a piston inside a cylinder to compress air .
Question 8
Air compressors are sometimes called:
