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FDNY A-35 | 51 Actual Questions and Answers with complete Solutions | Updated 2024
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FDNY A-35 | 51 Actual Questions and Answers with complete Solutions | Updated 2024
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FDNY A -35 | 51 Actual Questions and Answers wi th complete Solutions | Updated 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. 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.
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