FDNY A-35 Exam Questions & Answers 2023/2024
Air compressors power... - ANSWER-(1) industrial equipment and (2) construction tools
Examples of equipment powered by air compressor - ANSWER-pneumatic wrenches, lifts in auto service stations, paint spray booths
Air compressors enable... - ANS...
FDNY A-35 Exam Questions & Answers 2023/2024
Air compressors power... - ANSWER-(1) industrial equipment and (2) construction tools
Examples of equipment powered by air compressor - ANSWER-pneumatic wrenches, lifts in auto service stations, paint spray booths
Air compressors enable... - ANSWER-(1) efficient repair of all types of vehicles; and (2) facilitate their safe
operation on public thoroughfares
Permit is required for air compressor - ANSWER-that compresses air above 100 PSI
Types of air compressors - ANSWER-(1) reciprocating;
(2) centrifugal;
(3) solar; and
(4) rotary
*Difference is the way in which they compress air
How do air compressors work - 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.
Most common air compressor - ANSWER-Reciprocating
Air compressors are sometimes called - ANSWER-air pumps
Air compressors can be powered by: - ANSWER-(1) electric motors;
(2) internal combustion engines; or (3) steam turbines
Explosions & air compressors - 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.
To avoid explosions w/ air compressors - 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.
Power to air compressor - 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
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.
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