FDNY A35 UPDATED CORRECT QUESTIONS AND
ANSWERS SURE A+
✔✔Exception to single stage/multi stage distinction - ✔✔CAVEAT: 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).
✔✔Storage containers - ✔✔some systems force the compressed air from the receiver
into storage containers allowing it to be used later as needed.
✔✔System of Connected Air Compressors - ✔✔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.
Small compressors are air-cooled (fan).
Large compressors are water-cooled.
✔✔Low Oil Level Indicator Switch - ✔✔safety component.
ANSWERS SURE A+
✔✔Exception to single stage/multi stage distinction - ✔✔CAVEAT: 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).
✔✔Storage containers - ✔✔some systems force the compressed air from the receiver
into storage containers allowing it to be used later as needed.
✔✔System of Connected Air Compressors - ✔✔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.
Small compressors are air-cooled (fan).
Large compressors are water-cooled.
✔✔Low Oil Level Indicator Switch - ✔✔safety component.
