FDNY A-35 EXAM LATEST VERSION
QUESTIONS AND VERIFIED ACCURATE
ANSWERS SCORE A+
Air compressors are sometimes called - Correct Answerair pumps
Air compressors can be powered by: - Correct Answer(1) electric motors;
(2) internal combustion engines; or (3) steam turbines
Air compressors enable... - Correct Answer(1) efficient repair of all types of vehicles; and (2) facilitate their safe operation on public thoroughfares
Air compressors power... - Correct Answer(1) industrial equipment and (2) construction tools
Air intake valve - Correct Answersafety component.
Fitted w/ an air filter which prevents dust from being drawn into compression cylinder.Dust in the compressor could result in fire in the cylinder b/c of heat in the cylinder. Fire could case damage to air compressor.
This is why its important to make sure filter is always clean and securely connected to the compressor.
Air Reciever Operation - Correct AnswerWhen 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.
As air is compressed it becomes - Correct Answerheated.
This is why in a multi stage air compressor there is an intercooler between stages of compressor.
Automatic Control Device - Correct AnswerAttached to receiver.Shuts down compressor when pressure in receiver is adequate and restarts when more pressure needed.
CF Responsibility - Correct Answer-visually inspect -remain in area for a few minutes after compressor started -do not operate at speeds above recommended ranged
Cleaning Compressor - Correct Answeronly using soap and water solution.
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NEVER use benzene, kerosene or other light oils for this purpose. They may cause an explosion when mixed w/ air under pressure.
Both oil and water can cause an explosion if they actually enter the compressor tank.
Compliance w/ Lockout/Tagout - Correct Answerprevents 120 fatalities and 50,000 injuries each year.
Workers lose an average of 24 workdays for recuperation from exposure to hazardous energy.
Compression Chamber operation - Correct AnswerAir 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).
Constant Speed Control Switch - Correct Answersafety component.
Used when steady/constant demand for compressed air.
If demand drops excess compressed air is released through pressure release valve.
Cooling system - Correct Answersafety component.
compression chamber and compressed air must be cooled to avoid overheating.
Small compressors are air-cooled (fan).
Large compressors are water-cooled.
Examples of equipment powered by air compressor - Correct Answerpneumatic wrenches, lifts in auto service stations, paint spray booths
Exception to single stage/multi stage distinction - Correct AnswerCAVEAT: there are air compressors with multiple pistons and cylinders that are single stage but these are only the ones where each cylinder discharges directly into air receiver (unlike a true multi stage air compressor).
Explosions & air compressors - Correct AnswerIf 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.
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