FDNY A35 Exam Questions and Answers
(2026) | Comprehensive Review with
Detailed Rationales | A+ Verified
• What are air compressors used to power? CORRECT ANSWER: Industrial
equipment and construction tools
• What pressure compressor require a certificate holder to operate? CORRECT
ANSWER: 100+ psi
• What are two examples of tools air compressors power? CORRECT ANSWER:
Pneumatic wrenches and air lifts in automobile repair shops
• What are the 4 types of air compressors? CORRECT ANSWER: Reciprocating,
centrifugal, rotary, and solar
• How can air compressors be powered? CORRECT ANSWER: Electric motors,
internal combustion engines, and steam turbines
• What can be done to prevent flammable gasses from entering air compressors?
CORRECT ANSWER: Position the compressor 5 feet above ground
• What does the compression chamber consist of? CORRECT ANSWER: A piston
inside of a cylinder
• When the piston moves downward, what happens to the intake valve? CORRECT
ANSWER: It automatically opens and air is drawn into the cylinder
, • When air is compressed and the intake valve is close, which direction is the
piston moving? CORRECT ANSWER: It is moving upward
• When pressure reaches a certain level, what happens with the discharge valve?
CORRECT ANSWER: It opens to allow air into the receiver
• What is a single stage compressor? CORRECT ANSWER: A compressor that
pumps air into the receiver after one step of compression from one or more
cylinders and pistons.
• What is a multistage compressor? CORRECT ANSWER: A compressor that
discharges air between multiple cylinders before finally reaching the receiver,
reaching a new level of compression after passing each cylinder
• What happens to air when it is compressed? CORRECT ANSWER: It becomes
heated
• What cools the air after it's been compressed? CORRECT ANSWER: An
intercooler
• What is the purpose of an unloading valve? CORRECT ANSWER: To allow air
to escape when there is strain on the motor(usually during startup). Automatic in
most cases manual on older compressors.
• What ensures compressed air does not flow out when the unloading valve is
activated? CORRECT ANSWER: The check valve
• Where is the check valve located? CORRECT ANSWER: Between the
compressor head air line and the unloading valve air line.
(2026) | Comprehensive Review with
Detailed Rationales | A+ Verified
• What are air compressors used to power? CORRECT ANSWER: Industrial
equipment and construction tools
• What pressure compressor require a certificate holder to operate? CORRECT
ANSWER: 100+ psi
• What are two examples of tools air compressors power? CORRECT ANSWER:
Pneumatic wrenches and air lifts in automobile repair shops
• What are the 4 types of air compressors? CORRECT ANSWER: Reciprocating,
centrifugal, rotary, and solar
• How can air compressors be powered? CORRECT ANSWER: Electric motors,
internal combustion engines, and steam turbines
• What can be done to prevent flammable gasses from entering air compressors?
CORRECT ANSWER: Position the compressor 5 feet above ground
• What does the compression chamber consist of? CORRECT ANSWER: A piston
inside of a cylinder
• When the piston moves downward, what happens to the intake valve? CORRECT
ANSWER: It automatically opens and air is drawn into the cylinder
, • When air is compressed and the intake valve is close, which direction is the
piston moving? CORRECT ANSWER: It is moving upward
• When pressure reaches a certain level, what happens with the discharge valve?
CORRECT ANSWER: It opens to allow air into the receiver
• What is a single stage compressor? CORRECT ANSWER: A compressor that
pumps air into the receiver after one step of compression from one or more
cylinders and pistons.
• What is a multistage compressor? CORRECT ANSWER: A compressor that
discharges air between multiple cylinders before finally reaching the receiver,
reaching a new level of compression after passing each cylinder
• What happens to air when it is compressed? CORRECT ANSWER: It becomes
heated
• What cools the air after it's been compressed? CORRECT ANSWER: An
intercooler
• What is the purpose of an unloading valve? CORRECT ANSWER: To allow air
to escape when there is strain on the motor(usually during startup). Automatic in
most cases manual on older compressors.
• What ensures compressed air does not flow out when the unloading valve is
activated? CORRECT ANSWER: The check valve
• Where is the check valve located? CORRECT ANSWER: Between the
compressor head air line and the unloading valve air line.
