Shop (Lubrication Systems)

1. 1What will the result of operating an engine in extremely high temperatures using a lubricant recommended by the manufacturer for a much lower temperature?

   1. AThe oil pressure will be higher than normal.
   2. BThe oil temperature and oil pressure will be higher than normal.
   3. CThe oil pressure will be lower than normal.
2. 2(1) Gas turbine and reciprocating engine oils can be mixed or used interchangeably.
   (2) Most gas turbine engine oils are synthetic.
   
   Regarding the above statements,

   1. Aonly No. 2 is true.
   2. Bboth No. 1 and No. 2 are true.
   3. Cneither No. 1 nor No. 2 is true.
3. 3An oil separator is generally associated with which of the following?

   1. AEngine-driven oil pressure pump.
   2. BEngine-driven vacuum pump.
   3. CCuno oil filter.
4. 4The time in seconds required for exactly 60 cubic centimeters of oil to flow through an accurately calibrated orifice at a specific temperature is recorded as a measurement of the oil's

   1. Aflash point.
   2. Bspecific gravity.
   3. Cviscosity.
5. 5Upon what quality or characteristic of a lubricating oil is its viscosity index based?

   1. AIts resistance to flow at a standard temperature as compared to high grade paraffin-base oil at the same temperature.
   2. BIts rate of change in viscosity with temperature change.
   3. CIts rate of flow through an orifice at a standard temperature.
6. 6Lubricating oils with high viscosity index ratings are oils

   1. Ain which the viscosity does not vary much with temperature change.
   2. Bin which the viscosity varies considerably with temperature change.
   3. Cwhich have high SAE numbers.
7. 7Compared to reciprocating engine oils, the types of oils used in turbine engines

   1. Aare required to carry and disperse a higher level of combustion by-products.
   2. Bmay permit a somewhat higher level of carbon formation in the engine.
   3. Chave less tendency to produce lacquer or coke.
8. 8The oil used in reciprocating engines has a relatively high viscosity due to

   1. Athe reduced ability of thin oils to maintain adequate film strength at altitude (reduced atmospheric pressure).
   2. Bthe relatively high rotational speeds.
   3. Clarge clearances and high operating temperatures.
9. 9If all other requirements can be met, what type of oil should be used to achieve theoretically perfect engine lubrication?

   1. AThe thinnest oil that will stay in place and maintain a reasonable film strength.
   2. BAn oil that combines high viscosity and low demulsibility.
   3. CAn oil that combines a low viscosity index and a high neutralization number.
10. 10In addition to lubricating (reducing friction between moving parts), engine oil performs what functions.

    1. ACools.
    2. BSeals.
    3. CCleans.
    4. DPrevents corrosion.
    5. ECushions impact (shock) loads.

11. 11Which of these characteristics is desirable in turbine engine oil?

    1. ALow flash point.
    2. BHigh flash point.
    3. CHigh volatility.
12. 12The viscosity of a liquid is a measure of its

    1. Aresistance to flow.
    2. Brate of change of internal friction with change in temperature.
    3. Cweight, or density.
13. 13What type of oil system is usually found on turbine engines?

    1. ADry sump, pressure, and spray.
    2. BDry sump, dip, and splash.
    3. CWet sump, spray, and splash.
14. 14Which of the following factors helps determine the proper grade of oil to use in a particular engine?

    1. AAdequate lubrication in various altitudes of flight.
    2. BPositive introduction of oil to the bearings.
    3. COperating speeds of bearings.
15. 15Specific gravity is a comparison of the weight of a substance to the weight of an equal volume of

    1. Aoil at a specific temperature.
    2. Bdistilled water at a specific temperature.
    3. Cmercury at a specific temperature.
16. 16Which of the following has the greatest effect on the viscosity of lubricating oil?

    1. ATemperature.
    2. BEngine RPM.
    3. CSystem pressure.
17. 17What advantage do mineral base lubricants have over vegetable oil base lubricants when used in aircraft engines?

    1. ACooling ability.
    2. BChemical stability.
    3. CFriction resistance.
18. 18The recommended aircraft engine lubricants are

    1. Aanimal, mineral, or synthetic based.
    2. Bmineral or synthetic based.
    3. Cvegetable, mineral, or synthetic based.
19. 19High tooth pressures and high rubbing velocities, such as occur with spur-type gears, require the use of

    1. Aan EP lubricant.
    2. Bstraight mineral oil.
    3. Cmetallic ash detergent oil.
20. 20Manufacturers normally require turbine engine oil servicing within a short time after engine shutdown primarily to

    1. Aprevent overservicing.
    2. Bhelp dilute and neutralize any contaminants that may already be present in the engine's oil system.
    3. Cprovide a better indication of any oil leaks in the system.
21. 21The type of oil pumps most commonly used in turbine engines are classified as

    1. Apositive displacement.
    2. Bvariable displacement.
    3. Cconstant speed.
22. 22What will happen to the return oil if the oil line between the scavenger pump and the oil cooler separates?

    1. AOil will accumulate in the engine.
    2. BThe return oil will be pumped overboard.
    3. CThe scavenger return line check valve will close and force the oil to bypass directly to the intake side of the pressure pump.
23. 23At cruise RPM, some oil will flow through the relief valve of a gear-type engine oil pump. This is normal as the relief valve is set at a pressure which is

    1. Alower than pump inlet pressure.
    2. Blower than the pressure pump capabilities.
    3. Chigher than pressure pump capabilities.
24. 24(1) Fuel may be used to cool oil in gas turbine engines.
    (2) Ram air may be used to cool oil in gas turbine engines.
    
    Regarding the above statements,

    1. Aonly No. 1 is true.
    2. Bonly No. 2 is true.
    3. Cboth No. 1 and No. 2 are true.
25. 25The oil dampened main bearing utilized in some turbine engines is used to

    1. Aprovide lubrication of bearings from the beginning of starting rotation until normal oil pressure is established.
    2. Bprovide an oil film between the outer race and the bearing housing in order to reduce vibration tendencies in the rotor system, and to allow for slight misalignment.
    3. Cdampen surges in oil pressure to the bearings.
26. 26What is the purpose of the last chance oil filters?

    1. ATo prevent damage to the oil spray nozzle.
    2. BTo filter the oil immediately before it enters the main bearings.
    3. CTo assure a clean supply of oil to the lubrication system.
27. 27In a jet engine which uses a fuel-oil heat exchanger, the oil temperature is controlled by a thermostatic valve that regulates the flow of

    1. Afuel through the heat exchanger.
    2. Bboth fuel and oil through the heat exchanger.
    3. Coil through the heat exchanger.
28. 28In an axial-flow turbine engine, compressor bleed air is sometimes used to aid in cooling the

    1. Afuel.
    2. Binlet guide vanes.
    3. Cturbine, vanes, blades, and bearings.
29. 29Oil picks up the most heat from which of the following turbine engine components?

    1. ARotor coupling.
    2. BCompressor bearing.
    3. CTurbine bearing.
30. 30Which of the following is a function of the fuel-oil heat exchanger on a turbojet engine?

    1. AAerates the fuel.
    2. BEmulsifies the oil.
    3. CIncreases fuel temperature.
31. 31According to Federal Aviation Regulations, oil tank fillers on turbine engines must be marked with the word

    1. A"oil" and the type and grade of oil specified by the manufacturer.
    2. B"oil" and tank capacity.
    3. C"oil."
32. 32After making a welded repair to a pressurized-type turbine engine oil tank, the tank should be pressure checked to

    1. Anot less than 5 PSI plus the maximum operating pressure on the tank.
    2. Bnot less than 5 PSI plus the average operating pressure of the tank.
    3. C5 PSI.
33. 33Why are fixed orifice nozzles used in the lubrication system of gas turbine engines?

    1. ATo provide a relatively constant oil flow to the main bearings at all engine speeds.
    2. BTo keep back pressure on the oil pump, thus preventing an air lock.
    3. CTo protect the oil seals by preventing excessive pressure from entering the bearing cavities.
34. 34Possible failure related ferrous-metal particles in turbine engine oil cause an (electrical) indicating-type magnetic chip detector to indicate their presence by

    1. Adisturbing the magnetic lines of flux around the detector tip.
    2. Bbridging the gap between the detector center (positive) electrode and the ground electrode.
    3. Cgenerating a small electric current that is caused by the particles being in contact with the dissimilar metal of the detector tip.
35. 35What would be the probable result if the oil system pressure relief valve should stick in the open position on a turbine engine?

    1. AIncreased oil pressure.
    2. BDecreased oil pressure.
    3. CInsufficient lubrication.
36. 36What is the primary purpose of the oil-to-fuel heat exchanger?

    1. ACool the fuel.
    2. BCool the oil.
    3. CDe-aerate the oil.
37. 37What unit in an aircraft engine lubrication system is adjusted to maintain the desire system pressure?

    1. AOil pressure relief valve.
    2. BOil viscosity valve.
    3. COil pump.
38. 38Low oil pressure can be detrimental to the internal engine components. However, high oil pressure

    1. Ashould be limited to the engine manufacturer's recommendations.
    2. Bhas a negligible effect.
    3. Cwill not occur because of pressure losses around the bearings.
39. 39What is the primary purpose of the oil breather pressurization system that is used on turbine engines?

    1. APrevents foaming of the oil.
    2. BAllows aeration of the oil for better lubrication because of the air/oil mist.
    3. CProvides a proper oil spray pattern from the main bearing oil jets.
40. 40The purpose of directing bleed air to the outer turbine case on some engines is to

    1. Aprovide optimum turbine blade tip clearance by controlling thermal expansion.
    2. Bprovide up to 100 percent kinetic energy extraction from the flowing gases.
    3. Callow operation in a thermal environment 600 to 800°F above the temperature limits of turbine blade and vane alloys.
41. 41In order to relieve excessive pump pressure in an engine's internal oil system, most engines are equipped with a

    1. Avent.
    2. Bbypass valve.
    3. Crelief valve.
42. 42How are the teeth of the gears in the accessory section of an engine normally lubricated?

    1. ABy splashed or sprayed oil.
    2. BBy submerging the load-bearing portions in oil.
    3. CBy surrounding the load-bearing portions with baffles or housings within which oil pressure can be maintained.
43. 43From the following, identify the factor that has the least effect on the oil consumption of a specific engine.

    1. AMechanical efficiency.
    2. BEngine RPM.
    3. CLubricant characteristics.
44. 44Which of the following lubrication system components is never located between the pressure pump and the engine pressure system?

    1. AOil temperature bulb.
    2. BFuel line for oil dilution system.
    3. CCheck valve.
45. 45As an aid to cold-weather starting, the oil dilution system thins the oil with

    1. Akerosene.
    2. Balcohol.
    3. Cgasoline.
46. 46The basic oil pressure relief valve setting for a newly overhaul engine is made

    1. Awithin the first 30 seconds of engine operation.
    2. Bwhen the oil is at a higher than normal temperature to assure high oil pressure at normal oil temperature.
    3. Cin the overhaul shop.
47. 47If an oil filter element becomes completely clogged, the

    1. Aoil supply to the engine will be blocked.
    2. Boil will be bypassed back to the oil tank hopper where large sediments and foreign matter will settle out prior to passage through the engine.
    3. Cbypass valve will open and the oil pump will supply unfiltered oil to the engine.
48. 48What is the primary purpose of changing aircraft engine lubricating oils at predetermined periods?

    1. AThe oil becomes diluted with gasoline washing past the pistons into the crankcase.
    2. BThe oil becomes contaminated with moisture, acids, and finely divided suspended solid particles.
    3. CExposure to heat and oxygen causes a decreased ability to maintain a film under load.
49. 49What determines the minimum particle size which will be excluded or filtered by a cuno-type (stacked disc, edge filtration) filter?

    1. AThe disc thickness.
    2. BThe spacer thickness.
    3. CBoth the number and thickness of the discs in the assembly.
50. 50What is the primary purpose of the hopper located in the oil supply tank of some dry sump engine installations?

    1. ATo reduce the time required to warm the oil to operating temperatures.
    2. BTo reduce surface aeration of the hot oil and thus reduce oxidation and the formation of sludge and varnish.
    3. CTo impart a centrifugal motion to the oil entering the tank so that the foreign particles in the oil will separate more readily.
51. 51(1) Wet sump oil systems are most commonly used in gas turbine engines.
    (2) In most turbine engine oil tanks, a slight pressurization of the tank is desired to ensure a positive flow of oil.
    
    Regarding the above statements,

    1. Aboth No. 1 and No. 2 are true.
    2. Bonly No. 2 is true.
    3. Cneither No. 1 nor No. 2 is ture.
52. 52The pumping capacity of the scavenger pump in a dry sump aircraft engine's lubrication system

    1. Ais greater than the capacity of the oil supply pump.
    2. Bis less than the capacity of the oil supply pump.
    3. Cis usually equal to the capacity of the oil supply pump in order to maintain constant oiling conditions.
53. 53In which of the following situations will the oil cooler automatic bypass valve be open the greatest amount?

    1. AEngine oil above normal operating temperatures.
    2. BEngine oil below normal operating temperatures.
    3. CEngine stopped with no oil flowing after runup.
54. 54In order to maintain a constant oil pressure as the clearances between the moving parts of an engine increase through normal wear, the supply pump output.

    1. Aincreases as the resistance offered to the flow of oil increases.
    2. Bremains relatively constant (at a given RPM) with less oil being returned to the pump inlet by the relief valve.
    3. Cremains relatively constant (at a given RPM) with more oil being returned to the pump inlet by the relief valve.
55. 55What will result if an oil filter becomes completely blocked?

    1. AOil will flow at a reduced rate through the system.
    2. BOil flow to the engine will stop.
    3. COil will flow at the normal rate through the system.
56. 56A turbine engine dry sump lubrication system of the self-contained, high-pressure design.

    1. Ahas no heat exchanger.
    2. Bconsists of pressure, breather, and scavenge subsystems.
    3. Cstores oil in the engine crankcase.
57. 57Lube system last chance filters in turbine engines are usually cleaned

    1. Aduring annual inspection.
    2. Bduring 100-hour inspections.
    3. Cduring overhaul.
58. 58The vent line connecting the oil supply tank and the engine in some dry sump engine installations permits

    1. Apressurization of the oil supply to prevent cavitation of the oil supply pump.
    2. Boil vapors from the engine to be condensed and drained into the oil supply tank.
    3. Cthe oil tank to be vented through the normal engine vent.
59. 59An engine lubrication system pressure relief valve is usually located between the

    1. Aoil cooler and the scavenger pump.
    2. Bscavenger pump and the external oil system.
    3. Cpump and the internal oil system.
60. 60The purpose of a relief valve installed in the tank venting system of a turbine engine oil tank is to

    1. Aprevent oil pump cavitation by maintaining a constant pressure on the oil pump inlet.
    2. Bmaintain internal tank air pressure at the ambient atmospheric level regardless of altitude or rate of change in altitude.
    3. Cmaintain a positive internal pressure in the oil tank after shutdown to prevent oil pump cavitation on engine start.
61. 61If the oil in the oil cooler core and annular jacket becomes congealed, what unit prevents damage to the cooler?

    1. AOil pressure relief valve.
    2. BAirflow control valve.
    3. CSurge protection valve.
62. 62A drop in oil pressure may be caused by

    1. Athe temperature regulator sticking open.
    2. Bthe bypass valve sticking open.
    3. Cforeign material under the relief valve.
63. 63The main oil filters strain the oil at which point in the system?

    1. AImmediately after it leaves the scavenger pump.
    2. BImmediately before it enters the pressure pump.
    3. CJust as it leaves the pressure pump.
64. 64Which type valve prevents oil from entering the main accessory case when the engine is not running?

    1. ABypass.
    2. BRelief.
    3. CCheck.
65. 65An oil tank having a capacity of 5 gallons must have an expansion case of

    1. A2 quartz.
    2. B4 quartz.
    3. C5 quartz.
66. 66As a general rule, a small amount of small fuzzy particles or gray metallic paste on a turbine engine magnetic chip detector

    1. Ais considered to be the result of normal wear.
    2. Bindicates an imminent component failure.
    3. Cindicates accelerated generalized wear.
67. 67Why is expansion space required in an engine oil supply tank?

    1. ATo eliminate oil foaming.
    2. BFor oil enlargement and collection of foam.
    3. CFor proper oil tank ventilation.
68. 68The purpose of a dwell chamber in a turbine engine oil tank is to provide

    1. Aa collection point for sediments.
    2. Bfor a pressurized oil supply to the oil pump inlet.
    3. Cseparation of entrained air from scavenged oil.
69. 69Which of the following bearing types must be continuously lubricated by pressure oil?

    1. ABall.
    2. BRoller.
    3. CPlain.

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12 Shop (Powerplant) Quiz on Shop (Lubrication Systems), created by jocelyn2145 on 05/11/2015.

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