FDNY A-35 | 51 Actual Questions and Answers with complete Solutions | Updated
Question :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 :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;
(2) internal combustion engines; or (3) steam turbines
Question :Why is there a risk of explosions with 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 :How can you avoid explosions with air
compressors?
Correct answer: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.
Question :How is power supplied to an 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 :How does the compression chamber operate?
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 :How does the air receiver operate?
Correct answer:When air pressure reaches a certain level, it
forces open a DISCHARGE VALVE (which is spring
