FDNY A-35 questions with answers graded A+ 2023
Air compressors power... - Answer - (1) industrial equipment and (2) construction tools
Examples of equipment powered by air compressor - Answer - pneumatic wre
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FDNY A-35 questions with answers graded A+ 2023
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
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