FDNY A35 Exam - Questions With Verified Solutions
Air compressors power... Right Ans - (1) industrial equipment and (2)
construction tools
Examples of equipment powered by air compressor Right Ans - pneumatic
wrenches, lifts in auto service stations, paint spray booths
Air compressors enable... Right Ans - (1) efficient repair of all types of
vehicles; and (2) facilitate their safe operation on public thoroughfares
Permit is required for air compressor Right Ans - that compresses air
above 100 PSI
Types of air compressors Right Ans - (1) reciprocating;
(2) centrifugal;
(3) solar; and
(4) rotary
*Difference is the way in which they compress air
How do air compressors work Right Ans - 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.
Most common air compressor Right Ans - Reciprocating
Air compressors are sometimes called Right Ans - air pumps
Air compressors can be powered by: Right Ans - (1) electric motors;
(2) internal combustion engines; or
(3) steam turbines
Explosions & air compressors Right Ans - 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.
, To avoid explosions w/ air compressors Right Ans - Raise air compressor
at LEAST 5 feet above ground level so that no flammable gases are drawn into
the compressor. 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.
Power to air compressor Right Ans - 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
Compression Chamber operation Right Ans - 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 Right Ans - 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 Right Ans - with one cylinder and one piston
Multi Stage Air Compressor Right Ans - 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 Right Ans - heated.
Air compressors power... Right Ans - (1) industrial equipment and (2)
construction tools
Examples of equipment powered by air compressor Right Ans - pneumatic
wrenches, lifts in auto service stations, paint spray booths
Air compressors enable... Right Ans - (1) efficient repair of all types of
vehicles; and (2) facilitate their safe operation on public thoroughfares
Permit is required for air compressor Right Ans - that compresses air
above 100 PSI
Types of air compressors Right Ans - (1) reciprocating;
(2) centrifugal;
(3) solar; and
(4) rotary
*Difference is the way in which they compress air
How do air compressors work Right Ans - 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.
Most common air compressor Right Ans - Reciprocating
Air compressors are sometimes called Right Ans - air pumps
Air compressors can be powered by: Right Ans - (1) electric motors;
(2) internal combustion engines; or
(3) steam turbines
Explosions & air compressors Right Ans - 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.
, To avoid explosions w/ air compressors Right Ans - Raise air compressor
at LEAST 5 feet above ground level so that no flammable gases are drawn into
the compressor. 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.
Power to air compressor Right Ans - 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
Compression Chamber operation Right Ans - 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 Right Ans - 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 Right Ans - with one cylinder and one piston
Multi Stage Air Compressor Right Ans - 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 Right Ans - heated.
