FDNY A35 EXAM QUESTIONS AND ANSWERS
LATEST 2025-2026 UPDATE |GRADE A+
GUARANTEE
Compression Chamber operation - Answer-Air is compressed in
compression chamber which consists of a PISTON inside a
CYLINDER. Piston moves up and down.
When piston moves down -->draws air into cylinder, through
INTAKE VALVE (valve automatically opens when piston
moves down).
When piston moves up-->air is compressed (intake vale
automatically closes to avoid air escaping from cylinder).
Air Reciever Operation - Answer-When air pressure reaches a
certain level, it forces open a DISCHARGE VALVE (which is
spring loaded). This releases compressed air into air reciever
(aka air tank), which is what supplies compressed air when
needed.
Single Stage Air Compressor - Answer-with one cylinder and
one piston
, Multi Stage Air Compressor - Answer-with more than one
piston and cylinder.
Each cylinder will increase the pressure of the air by taking air
from the discharge side of the previous cylinder and increasing
the pressure to a new level. Once it reaches the last level, the
pressurized air is discharged into the reciever.
As air is compressed it becomes - Answer-heated.
This is why in a multi stage air compressor there is an
intercooler between stages of compressor.
Exception to single stage/multi stage distinction - Answer-
CAVEAT: there are air compressors with multiple pistons and
cylinders that are single stage but these are only the ones where
each cylinder discharges directly into air receiver (unlike a true
multi stage air compressor).
Storage containers - Answer-some systems force the
compressed air from the receiver into storage containers
allowing it to be used later as needed.
LATEST 2025-2026 UPDATE |GRADE A+
GUARANTEE
Compression Chamber operation - Answer-Air is compressed in
compression chamber which consists of a PISTON inside a
CYLINDER. Piston moves up and down.
When piston moves down -->draws air into cylinder, through
INTAKE VALVE (valve automatically opens when piston
moves down).
When piston moves up-->air is compressed (intake vale
automatically closes to avoid air escaping from cylinder).
Air Reciever Operation - Answer-When air pressure reaches a
certain level, it forces open a DISCHARGE VALVE (which is
spring loaded). This releases compressed air into air reciever
(aka air tank), which is what supplies compressed air when
needed.
Single Stage Air Compressor - Answer-with one cylinder and
one piston
, Multi Stage Air Compressor - Answer-with more than one
piston and cylinder.
Each cylinder will increase the pressure of the air by taking air
from the discharge side of the previous cylinder and increasing
the pressure to a new level. Once it reaches the last level, the
pressurized air is discharged into the reciever.
As air is compressed it becomes - Answer-heated.
This is why in a multi stage air compressor there is an
intercooler between stages of compressor.
Exception to single stage/multi stage distinction - Answer-
CAVEAT: there are air compressors with multiple pistons and
cylinders that are single stage but these are only the ones where
each cylinder discharges directly into air receiver (unlike a true
multi stage air compressor).
Storage containers - Answer-some systems force the
compressed air from the receiver into storage containers
allowing it to be used later as needed.
