FDNY A-35 100% VERIFIED ANSWERS 2024/2025 CORRECT STUDY SET, Exams of Nursing

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FDNY A- 35 100% VERIFIED

ANSWERS 2024/

CORRECT STUDY SET

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

Air forced from one compressor into another several time to increase pressure each time and ultimately forced into a hose line or storage container. Used when there is a need for air under very high pressure. Unloading Valve safety component. allows air to escape compression chamber when there is a strain on the electrical motor. This usually occurs in the first few cycles when the compressor is first started. Automatic in most systems but it may be manual in older compressors. Follow instruction manual for old compressor. Pressure Gauge safety component. Indicates pressure inside receiver. CF holder should pay close attention to reading. Must NEVER exceed manufacturer's recommendations. If greater than recommended level there could be explosion. Pressure in the receiver is controlled by a switch; turn switch in the desired direction to adjust pressure. Pressure Relief Valve safety component. Allows air to escape from the system when pressure is too great. Operate automatically. May operate manually by pulling on the ring attached to the pressure relief valve Air intake valve safety 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. Filter & Moisture Separator Assembly (FMSA) safety component. Moisture can be a problem; this filter removes moisture from compressed air. Installed between compressor and receiver. Drain cock attached to FMSA to drain water and dirt. Automatic Control Device Attached to receiver. Shuts down compressor when pressure in receiver is adequate and restarts when more pressure needed. Safety Relief Valves safety component. keep compressor tank from bursting if pressures witch stops working Constant Speed Control Switch safety component. Used when steady/constant demand for compressed air. If demand drops excess compressed air is released through pressure release valve. Cooling system safety component. compression chamber and compressed air must be cooled to avoid overheating.

Heat & Compressor

• never place combustible materials nearby;
• do not use near devices that produce heat; solar heat is not known to cause overheating CF Responsibility
• visually inspect
• remain in area for a few minutes after compressor started
• do not operate at speeds above recommended ranged Injury from Compressor
• Dust or debris blow off clothing can be driven under skin causing DEATH
• Eardrum ruptures at 40 PSI
• Air entering mouth can destroy lungs and internal organs
• Eyesight (always wear googles) Hydrostatic testing Fire Code no longer requires affidavit indicating reciever is hydrostactically tested and defect free. HOWEVER, test every 5 years at a minimum is reccomended. Cleaning Compressor only using soap and water solution. 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. Maintenance-Cooling System

Tested every 6 months. Water supply control valves always open when compressor in operation Maintenance-Air Intake Filter Inspected/cleaned weekly. Replaced every 6 months. Replace if damaged Maintenance-Lubrication Oil Level checked weekly using dipstick Replaced every 6 months Refer to manufacturer manual for safe operating temperatures of oil and grade of oil needed. Maintenance-Automatic Low level Oil Indicator Switch Tested every 3 months by manually draining oil from compressor. Do not run compressor for a long period of time when testing this way. Maintenance-Air Reciever Tested every 5 years by qualified technician Water buildup in moisture separator assembly and air receiver drained daily by opening drain valve EXCEPT when temperature below 40 degrees Safety valves should be manually operated every week. Maintenance-Hose Connections Make sure tight, frequently. Never twist, bend, curl to stop it.

Acceptable temp are in the maintenance manual. Overheating can cause damage to compressor and is a potential fire hazard. If overheating discovered water cooling mechanism must be checked. Lockout/Tagout Safety Procedures Lock the device or the power source w/ a hasp and placing it in such a position that no hazardous power sources can be turned on. Also requires a tag to be affixed to the lockout device indicating it should not be turned on. Know OSHA Standard for Control of Hazardous Energy (Lockout/Tagout) procedure. Compliance w/ Lockout/Tagout prevents 120 fatalities and 50,000 injuries each year. Workers lose an average of 24 workdays for recuperation from exposure to hazardous energy.