FDNY A-35 Exam with Verified Answers Graded A+
1. Air compressors
power...
2. Examples of
equipment pow-
ered by air com-
pressor
3. Air compressors
enable...
4. Permit is re-
quired for air
compressor
5. Types of air com-
pressors
6. How do air com-
pressors work
7. Most common air...
1. Air compressors (1) industrial equipment and (2) construction tools
power...
2. Examples of pneumatic wrenches, lifts in auto service stations, paint
equipment pow- spray booths
ered by air com-
pressor
3. Air compressors (1) efficient repair of all types of vehicles; and (2) facilitate
enable... their safe operation on public thoroughfares
4. Permit is re- that compresses air above 100 PSI
quired for air
compressor
5. Types of air com- (1) reciprocating;
pressors (2) centrifugal;
(3) solar; and
(4) rotary
*Difference is the way in which they compress air
6. How do air com- take the air in a room and force it into a container UNDER
pressors work PRESSURE. The more air forced into the container, the
greater the pressure. Compressed air can be discharged
from the container at a controlled rate.
7. Most common air Reciprocating
compressor
8. Air compressors air pumps
are sometimes
called
9. Air compressors (1) electric motors;
can be powered (2) internal combustion engines; or
by: (3) steam turbines
10. Explosions & air If there is a build up of flammable gases (ex: in service
compressors stations and workshops), those gases are heavier than air
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, FDNY A-35 Exam with Verified Answers Graded A+
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.
11. To avoid explo- Raise air compressor at LEAST 5 feet above ground level
sions w/ air com- so that no flammable gases are drawn into the compres-
pressors sor. To meet the height requirement you can place com-
pressor 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.
12. Power to air com- entire unit is driven by an electric motor. Motor activates a
pressor series of drive belts. Belts power the moving parts of the
unit--like w/ power steering and alternator in automobile
13. Compression Air is compressed in compression chamber which consists
Chamber of a PISTON inside a CYLINDER. Piston moves up and
operation 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).
14. Air Reciever Op- When air pressure reaches a certain level, it forces open a
eration DISCHARGE VALVE (which is spring loaded). This releas-
es compressed air into air reciever (aka air tank), which is
what supplies compressed air when needed.
15. Single Stage Air with one cylinder and one piston
Compressor
16. Multi Stage Air with more than one piston and cylinder.
Compressor
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
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