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FDNY A-35 EXAM ACTUAL EXAM COMPLETE 200
QUESTIONS AND DETAILED SOLUTIONS JUST
RELEASED
Question: Types of air compressors - CORRECT ANSWER✔✔(1) reciprocating;
(2) centrifugal;
(3) solar; and
(4) rotary
*Difference is the way in which they compress air
Question: How do air compressors work - CORRECT ANSWER✔✔take the air in a room and
force it into a container UNDER PRESSURE. The more air forced into the container, the greater
the pressure. Compressed air can be discharged from the container at a controlled rate.
Question: Most common air compressor - CORRECT ANSWER✔✔Reciprocating
Question: Air compressors are sometimes called - CORRECT ANSWER✔✔air pumps
Question: Air compressors can be powered by: - CORRECT ANSWER✔✔(1) electric motors;
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(2) internal combustion engines; or
(3) steam turbines
Air compressors power... - CORRECT ANSWER✔✔(1) industrial equipment and (2) construction
tools
Question: Examples of equipment powered by air compressor - CORRECT
ANSWER✔✔pneumatic wrenches, lifts in auto service stations, paint spray booths
Question: Air compressors enable... - CORRECT ANSWER✔✔(1) efficient repair of all types of
vehicles; and (2) facilitate their safe operation on public thoroughfares
Question: Permit is required for air compressor - CORRECT ANSWER✔✔that compresses air
above 100 PSI
Question: Explosions & air compressors - CORRECT ANSWER✔✔If there is a build up of
flammable gases (ex: in service stations and workshops), those gases are heavier than air and
fall to the floor before spreading outward. These gases are easily ignited by sparks and high
temperatures--which INCLUDES the heat generated by an air compressor.
Question: To avoid explosions w/ air compressors - CORRECT ANSWER✔✔Raise air compressor
at LEAST 5 feet above ground level so that no flammable gases are drawn into the compressor.
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To meet the height requirement you can place compressor on a shelf or bench OR the air
receiver tank may be turned and stood on end w/ the air compressor bolted to the top of the
tank.
Question: Power to air compressor - CORRECT ANSWER✔✔entire unit is driven by an electric
motor. Motor activates a series of drive belts. Belts power the moving parts of the unit--like w/
power steering and alternator in automobile
Question: Compression Chamber operation - CORRECT 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).
Question: Air Reciever Operation - CORRECT 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.
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Question: Single Stage Air Compressor - CORRECT ANSWER✔✔with one cylinder and one
piston
Question: Multi Stage Air Compressor - CORRECT 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.
Question: As air is compressed it becomes - CORRECT ANSWER✔✔heated.
This is why in a multi stage air compressor there is an intercooler between stages of compressor.
Question: Exception to single stage/multi stage distinction - CORRECT 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).
Question: Storage containers - CORRECT ANSWER✔✔some systems force the compressed air
from the receiver into storage containers allowing it to be used later as needed.
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