Flashcards
Oil Systems
Flashcards do conjunto (53)
- 1what are the three main purposes of oilcooling
lubrication
cleaning - 2what is the primary function of the oil systemreducing friction and wear between the moving components of the engine
- 3why must the oil be cleaneddirt must be removed from the oil before it damages the bearing or blocks small oil passageways within the engine
- 4why must the oil have anti-corrosion propertiesbearings within the engine are manufactured from steel which would oxidise unless it had a coating of oil
- 5why must the oil have cooling propertiesneed to cooled if they are to withstand the constant heat and mechanical stresses.
- 6how does the engine cool the bearingstakes away the heat away and transfers it to the oil coolers
- 7how can the oil act as hydraulic fluidin most turboprop engines the control of the pitch of the propellor heads is achieved by using engine lubricating oil as an hydraulic medium
- 8what is the general principe of the lubrication system of a GTEself contained recirculatory lubrication system
- 9what are the two types of recirculatory systemspressure relief valve system (PRVS)
full flow system - 10what is the construction of the pressure relief valve and oil pump in the PRVSparallel
- 11what is the function of the pressure relief valvelimit the pump outlet pressure
- 12what is the main principle/ goal of the PRVSto ensure oil pressure remains constant regardless of engine speed and oil temperatures
- 13when would the PRVS be usedin engines that have low levels of bearing chamber pressurisation and pressure does not increase much with pressure RPM
- 14what sort of engines is the PRVS not suited tomodern engines with high bearing chamber pressures
- 15EDPengine driven pump
- 16how can you tell if there is a problem in the PRVan indicator will pop out
- 17what is the purpose of the system pressure relief valveto ensure that pressure is always the same after the pressure filter
- 18how are the pumps drivenby the accessory gear box
- 19what does the full flow system allow forsmaller oil pumps than an equivalent pressure relief system to be used
- 20what is the full flow system more capable of achievingoptimum oil flow rates throughout engine speed range
- 21how can the full flow lubrication system achieve the required oil flow to the engineallowing the oil pressure pump to supply the oil feed the oil feed jets directly
- 22what happens as you go faster in regards to the oilthe oil gets burned as it heats up
- 23when does the full flow system use the full capacity of the pumpsat maximum engine speed
- 24what does the full flow system allow in regards to bearing pressureshigher bearing pressures
- 25what determines the distribution of the flowrestrictors at the end of each branch of the system
- 26in a full flow system what will the oil pressure indicators indicatea change according to engine operating condition
- 27why are pressure relief valves implemetedto protect system components from the extreme pressure that could be generated in abnormal circumstances
- 28where is the oil tank usually mountedas a separate unit on the side of the engines
- 29where are the oil pumps typically installedin a oil pump pack fitted to the accessory housing
- 30what should you do if an oil pump failsshut the engine down
- 31when can you check the oil level of the dry sumpat any time
- 32what do you need to do before checking the oil level of a wet sumpleave it for 10 minutes and them check the level
- 33what types of oil coolers can be usedair cooled or fuel cooled or both
- 34where are the magnetic chip detectorsin the scavenge line
- 35what is the purpose of the magnetic chip detectorscollect ferrous material from the oil before the scavenge pumps
- 36what sort of fitting is used to retain in the pipelinebayonet fitting with a self sealing valve housing
- 37what is the purpose of the centrifugal breatherto get rid of any air in the oil
- 38how does the centrifugal breather de-aerateit spins very fast , and allows the air to flow out to ambient
- 39what can air in the oil causecavitation
- 40why are filters fittedto prevent debris and foreign matter from being continuously circulated
- 41which filter is more powerfula high pressure filter
- 42what id the purpose of the thread type filterslast chance filter immediately before the oil jets
- 43DPIdifferential pressure indicator
- 44what does a DPS indicatethat the filters MAY be clogged/ about to be clogged
- 45what expansion do roller bearings allow foraxial and radial
- 46what loads can roller bearings supportradial loads only
- 47what expansion can ball bearing allow forradial expansion only
- 48what loads can ball bearings supportaxial and radial loads
- 49what are labyrinth sealed used forlining the seal to the to the bearing housings, and prevent oil escaping
- 50how do labyrinth seals seal the housingby using high pressure air through an irregular path and lining to the seal the housing
prevent the teeth from bending out of shape - 51what can carbon seals be described assealed units (like batteries)
- 52where is the oil temp sensorupstream of the centrifugal breather
- 53where is the oil pressure sensordownstream of the fuel cooled oil cooler
Informações
- Descrição
- AGK (Powerplants) FlashCards sobre Oil Systems, criado por Ella Davies em 09-05-2018.
- Criado por
- Ella Davies
- Visualizações
- 0
- Avaliação