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92 Cards in this Set
- Front
- Back
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What will be the result of operating an engine in extremely high temperatures using a lubricant recommended by the manufacturer for a much lower temperature? A - the oil pressure will be higher than normal B - the oil temperature and oil pressure will be higher than normal C - the oil pressure will be lower than normal |
C - the oil pressure will be lower than normal |
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(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, A - only No. 2 is true B - both No. 1 and No. 2 are true C - neither No. 1 nor No. 2 is true |
A - only No. 2 is true |
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A - Engine-driven oil pressure pump B - Engine-driven vacuum pump C - Cuno oil filter |
B - Engine-driven vacuum pump |
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The time in seconds required for exactly 60 cubic centimeter of oil to flow through an accurately calibrated orifice at a specific temperature is recorded as a measurement of the oil's A - flash point B - specific gravity C - viscosity |
C - viscosity |
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A - its resistance to flow at a standard temperature as compared to high grade paraffin-base oil at the same temperature B - its rate of change in viscosity with temperature change C - its rate of flow through an orifice at a standard temperature |
B - its rate of change in viscosity with temperature change |
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Lubricating oils with high viscosity index ratings are oils A - in which the viscosity does not vary much with temperature change B - in which the viscosity varies considerable with temperature change C - which have high SAE numbers |
A - in which the viscosity does not vary much with temperature change |
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Compared to reciprocating engine oils, the types of oils used in turbine engines A - are required to carry and disperse a higher level of combustion by-products B - may permit a somewhat higher level of carbon formation in the engine C - have less tendency to produce lacquer or coke |
C - have less tendency to produce lacquer or coke |
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The oil used in reciprocating engines has a relatively high viscosity due to A - the reduced ability of thin oils to maintain adequate film strength at altitude (reduced atmospheric pressure) B - the relatively high rotational speeds C - large clearances and high operating temperatures |
C - large clearances and high operating temperatures |
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If all other requirements can be met, what type of oil should be used to achieve theoretically perfect engine lubrication? A - the thinnest oil that will stay in place and maintain a reasonable film strength B - an oil that combines high viscosity and low demulsibility C - an oil that combines a low viscosity index and a high neutralization number |
A - the thinnest oil that will stay in place and maintain a reasonable film strength |
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In addition to lubricating (reducing friction between moving parts), engine oil performs what functions? 1. cools 2. seals 3. cleans 4. prevents corrosion 5. cushions impact (shock) loads A - 1, 2, 3, 4 B - 1, 2, 3, 4, 5 C - 1, 3, 4 |
B - 1, 2, 3, 4, 5 |
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Which of these characteristics is desirable in turbine engine oil? A - low flash point B - high flash point C - high volatility |
B - high flash point |
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The viscosity of a liquid is a measure of its A - resistance to flow B - rate of change of internal friction with change in temperature C - weight, or density |
A - resistance to flow |
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What type of oil system is usually found on turbine engines? A - dry sump, pressure, and spray B - dry sump, dip, and splash C - wet sump, spray, and splash |
A - dry sump, pressure, and spray |
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Which of the following factors helps determine the proper grade of oil to use in a particular engine? A - adequate lubrication in various attitudes of flight B - positive introduction of oil to the bearings C - operating speeds of bearings |
C - operating speeds of bearings |
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A - oil at a specific temperature B - distilled water at a specific temperature C - mercury at a specific temperature |
B - distilled water at a specific temperature |
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Which of the following has the greatest effect on the viscosity of lubricating oil? A - temperature B - engine RPM |
A - temperature |
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A - cooling ability B - chemical stability C - friction resistance |
B - chemical stability |
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The recommended aircraft engine lubricants are A - animal, mineral, or synthetic based B - mineral or synthetic based C - vegetable, mineral, or synthetic based |
B - mineral or synthetic based |
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High tooth pressures and high rubbing velocities, such as occur with spur-type gears, require the use of A - an EP lubricant B - straight mineral oil C - metallic ash detergent oil |
A - an EP lubricant |
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A - prevent overservicing B - help dilute and neutralize any contaminants that may already be present in the engine's oil system C - provide a better indication of any oil leaks in the system |
A - prevent overservicing |
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What type of oil do most engine manufacturers recommend for new reciprocating engine break-in? A - ashless-dispersant oil B - straight mineral oil C - semi-synthetic oil |
B - straight mineral oil |
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What type of oil do most engine manufacturers recommend after new reciprocating engine break-in? A - metallic-ash detergent oil B - ashless-dispersant oil C - straight mineral oil |
B - ashless-dispersant oil |
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A - positive displacement B - variable displacement C - constant speed |
A - positive displacement |
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A - FULL RICH B - LEAN |
A - FULL RICH |
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A - the engine oil supply pump and the internal lubrication system B - the scavenger pump outlet and the oil storage tank C - the oil storage tank and the engine oil supply pump |
B - the scavenger pump outlet and the oil storage tank |
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What will happen to the return oil if the oil line between the scavenger pump and the oil cooler separates? A - oil will accumulate in the engine B - the return oil will be pumped overboard C - the scavenger return line check valve will close and force the oil to bypass directly to the intake side of the pressure pump |
B - the return oil will be pumped overboard |
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At 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 A - lower than the pump inlet pressure B - lower than the pressure pump capabilities C - higher than pressure pump capabilities |
B - lower than the pressure pump capabilities |
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(2) Ram air may be used to cool oil in gas turbine engines. Regarding the above statements, A - only No. 1 is true B - only No. 2 is true C - both No. 1 and No. 2 are true |
C - both No. 1 and No. 2 are true |
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In a reciprocating engine oil system, the temperature bulb senses oil temperature A - at a point after the oil has passed through the oil cooler B - while the oil is in the hottest area of the engine C - immediately before the oil enter the oil cooler |
A - at a point after the oil has passed through the oil cooler |
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The oil dampened main bearing utilized in some turbine engines is used to A - provide lubrication of bearings from the beginning of starting rotation until normal oil pressure is established B - provide 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 C - dampen surges in oil pressure to the bearings |
B - provide 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 |
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What is the purpose of the last chance oil filters? A - to prevent damage to the oil spray nozzle B - to filter the oil immediately before it enters the main bearings C - to assure a clean supply of oil to the lubrication system |
B - to filter the oil immediately before it enters the main bearings |
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In a jet engine which uses a fuel-oil heat exchanger, the oil temperature is controlled by a thermostatic valve that regulates the flow of A - fuel through the heat exchanger B - both fuel and oil through the heat exchanger C - oil through the heat exchanger |
C - oil through the heat exchanger |
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A - oil tank check valve B - oil pressure relief valve C - oil tank vent |
C - oil tank vent |
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In an axial-flow turbine engine, compressor bleed air is sometimes used to aid in cooling the A - fuel B - inlet guide vanes C - turbine, vanes, blades, and bearings |
C - turbine, vanes, blades, and bearings |
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Oil picks up the most heat from which of the following turbine engine components? A - rotor coupling B - compressor bearing C - turbine bearing |
C - turbine bearing |
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Which of the following is a function of the fuel-oil heat exchanger on a turbojet engine? A - aerates the fuel B - emulsifies the oil C - increases fuel temperature |
C - increases fuel temperature
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A - "oil", and tank capacity, in accordance with 14 CFR part 45 B - "oil", type, and grade, in accordance with 14 CFR part 33 C - "oil", in accordance with 14 CFR part 23 |
C - "oil", in accordance with 14 CFR part 23 |
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After making a welded repair to a pressurized-type turbine engine oil tank, the tank should be pressure checked to A - not less than 5 PSI plus the maximum operating pressure of the tank B - not less than 5 PSI plus the average operating pressure of the tank C - 5 PSI |
checked to A - not less than 5 PSI plus the maximum operating pressure of the tank |
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Why are fixed orifice nozzles used in the lubrication system of gas turbine engines? A - to provide a relatively constant oil flow to the main bearings at all engine speeds B - to keep back pressure on the oil pump, thus preventing an air lock C - to protect the oil seals preventing excessive pressure from entering the bearing cavities |
A - to provide a relatively constant oil flow to the main bearings at all engine speeds |
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Possible failure related ferrous-metal particles in turbine engine oil cause an (electrical) indicating-type magnetic chip detector to indicate their presence by A - disturbing the magnetic lines of flux around the detector tip B - bridging the gap between the detector center (positive) electrode and the ground electrode C - generating a small electric current that is caused by the particles being in contact with the dissimilar metal of the detector tip |
B - bridging the gap between the detector center (positive) electrode and the ground electrode1 |
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What would be the probable result if the oil system pressure relief valve should stick in the open position on a turbine engine? A - increased oil pressure B - decreased oil temperature C - insufficient lubrication |
C - insufficient lubrication |
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A - cool the fuel B - cool the oil C - de-aerate the oil |
B - cool the oil |
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What unit in an aircraft engine lubrication system is adjusted to maintain the desired system pressure? A - oil pressure relief valve B - oil viscosity valve B - oil pump |
A - oil pressure relief valve |
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Low oil pressure can be detrimental to the internal engine components. However, high oil pressure A - should be limited to the engine manufacturer's recommendations B - has a negligible effect C - will not occur because of pressure losses around the bearings |
A - should be limited to the engine manufacturer's recommendations |
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What is the primary purpose of the oil breather pressurization system that is used on turbine engines? A - prevents foaming of the oil B - allows aeration of the oil for better lubrication because of the air/oil mist C - provides a proper oil spray pattern from the main bearing oil jets |
C - provides a proper oil spray pattern from the main bearing oil jets |
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The purpose of directing bleed air to the outer turbine case on some engines is to A - provide optimum turbine blade tip clearance by controlling thermal expansion B - provide up to 100 percent kinetic energy extraction from the flowing gases C - allow operation in a thermal environment 600 to 800 degrees F above the temperature limits of turbine blade and vane alloys |
A - provide optimum turbine blade tip clearance by controlling thermal expansion |
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Some larger reciprocating engines use a compensating oil pressure relief valve to A - provide a high engine oil pressure when the oil is cold and automatically lower the oil pressure when the oil warm up B - compensate for changes in atmospheric pressure that accompany altitude changes C - automatically keep oil pressure nearly the same whether the oil is warm or cold |
A - provide a high engine oil pressure when the oil is cold and automatically lower the oil pressure when the oil warm up |
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In order to relieve excessive pump pressure in an engine's internal oil system, most engines are equipped with a A - vent B - bypass valve C - relief valve |
C - relief valve |
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What is the source of most of the heat that is absorbed by the lubricating oil in a reciprocating engine? A - crankshaft main bearings B - exhaust valves C - pistons and cylinder walls |
C - pistons and cylinder walls |
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How are the teeth of the gears in the accessory section of an engine normally lubricated? A - by splashed or sprayed oil B - by submerging the load-bearing portions in oil C - by surrounding the load-bearing portions with baffles or housings within which oil pressure can be maintained |
A - by splashed or sprayed oil |
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A - to prevent the scavenger pump from losing its prime B - to prevent the oil from the supply tank from seeping into the crankcase during inoperative periods C - to prevent the oil from the pressure pump from entering the scavenger system |
B - to prevent the oil from the supply tank from seeping into the crankcase during inoperative periods |
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From the following, identify the factor that has the least effect on the oil consumption of a specific engine. A - mechanical efficiency B - engine RPM C - lubricant characteristics |
A - mechanical efficiency |
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A - down vertical slots cut in the piston wall between the piston oil ring groove and the piston skirt B - through holes drilled in the piston oil ring groove C - through holes drilled in the piston pin recess |
B - through holes drilled in the piston oil ring groove |
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Which of the following lubrication system components is never located between the pressure pump and the engine pressure system? A - oil temperature bulb B - fuel line for oil dilution system C - check valve |
B - fuel line for oil dilution system |
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A - kerosene B - alcohol C - gasoline |
C - gasoline |
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The basic oil pressure relief valve setting for a newly overhauled engine is made A - within the first 30 seconds of engine operation B - when the oil is at a higher than normal temperature to assure high oil pressure at normal oil temperature C - in the overhaul shop |
C - in the overhaul shop |
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Where is the oil temperature bulb located on a dry sump reciprocating engine? A - oil inlet line B - oil cooler C - oil outlet line |
A - oil inlet line |
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Cylinder walls are usually lubricated by A - splashed or sprayed oil B - a direct pressure system fed through the crankshaft, connecting rods, and the piston pins to the oil control ring groove in the piston |
A - splashed or sprayed oil |
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If an oil filter element becomes completely clogged, the A - oil supply to the engine will be blocked B - oil will be bypassed back to the oil tank hopper where larger sediments and foreign matter will settle out prior to passage through the engine C - bypass valve will open and the oil pump will supply unfiltered oil to the engine |
C - bypass valve will open and the oil pump will supply unfiltered oil to the engine |
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oil accumulation in the cylinders of an inverted inline engine and in the lower cylinders of a radial engine is normally reduced or prevented by A - reversed oil control rings B - routing the valve-operating mechanism lubricating oil to a separate scavenger pump C - extended cylinder skirts |
C - extended cylinder skirts |
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What is the primary purpose of changing aircraft engine lubricating oils at predetermined periods?
A - the oil becomes diluted with gasoline washing past the pistons into the crankcase B - the oil becomes contaminated with moisture, acids, and finely divided suspended solid particles C - exposure to heat and oxygen causes a decreases ability to maintain a film under load |
B - the oil becomes contaminated with moisture, acids, and finely divided suspended solid particles
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What determines the minimum particle size which will be excluded or filtered by a cuno-type (stacked disc, edge filtration) filter? A - the disc thickness B - the spacer thickness C - both the number and thickness of the discs in the assembly |
B - the spacer thickness |
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What is the primary purpose of the hopper located in the oil supply tank of some dry sup engine installations? A - to reduce the time required to war the oil to operating temperatures B - to reduce surface aeration of the hot oil and thus reduce oxidation and the formation of sludge and varnish C - to impart a centrifugal motion to the oil entering the tank so that the foreign particles in the oil will separate more readily |
C - to impart a centrifugal motion to the oil entering the tank so that the foreign particles in the oil will separate more readily |
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The purpose of the flow control valve in a reciprocating engine oil system is to A - direct oil through or around the oil cooler B - deliver cold oil to the hopper tank C - compensate for volumetric increases due to foaming of the oil |
A - direct oil through or around the oil cooler |
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Where are the sludge chambers, when used in aircraft engine lubrication systems, usually located? A - in the crankshaft throws B - adjacent to the scavenger pumps C - in the oil storing tank |
A - in the crankshaft throws |
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Why is an aircraft reciprocating engine oil tank on a dry sump lubrication system equipped with a vent line? A - to prevent pressure buildup in the reciprocating engine crankcase B - to eliminate foaming in the oil tank C - to prevent pressure buildup in the oil tank |
C - to prevent pressure buildup in the oil tank |
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Excessive oil is prevented from accumulating on the cylinder walls of a reciprocating engine by A - line design shape of the piston skirt B - internal engine pressure bleeding past the ring grooves C - oil control rings on the pistons |
C - oil control rings on the pistons |
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(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, A - both No. 1 and No. 2 are true B - only No. 2 is true C - neither No.1 nor No. 2 is true |
B - only No. 2 is true |
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The pumping capacity of the scavenger pump in a dry sump aircraft engine's lubrication system A - is greater than the capacity of the oil supply pump B - is less than the capacity of the oil supply pump C - is usually equal to the capacity of the oil supply pump in order to maintain constant oiling conditions |
A - is greater than the capacity of the oil supply pump |
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In which of the following situations will the oil cooler automatic bypass valve be open the greatest amount? A - engine oil above normal operating temperatures B - engine oil below normal operating temperatures C - engine stopped with no oil flowing after sunup |
B - engine oil below normal operating temperatures |
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In 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 A - increases as the resistance offered to the flow of oil increases B - remains relatively constant (at a given RPM) with less oil being returned to the pump inlet by the relief valve C - remains relatively constant (at a given RPM) with more oil being returned to the pump inlet by the relief valve |
B - remains relatively constant (at a given RPM) with less oil being returned to the pump inlet by the relief valve |
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The valve assemblies of opposed reciprocating engines are lubricated by means of a A - gravity feed system B - splash and spray system C - pressure system |
C - pressure system |
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What will result if an oil filter becomes completely blocked? A - oil will flow at a reduced rate through the system B - oil flow to the engine will sot C - oil will flow at the normal rate through the system |
C - oil will flow at the normal rate through the system |
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A turbine engine dry sump lubrication system of the self-contained, high-pressure design A - has no heat exchanger B - consists of pressure, breather, and scavenge subsystems C - stores oil in the engine crankcase |
B - consists of pressure, breather, and scavenge subsystems |
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Lube system last chance filters in turbine engines are usually cleaned A - during annual inspection B - during 100-hour inspection C - during overhaul |
C - during overhaul |
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How are the piston pins of most aircraft engines lubricated? A - by pressure oil through a drilled passageway in the heavy web portion of the connecting rod B - by oil which is sprayed or thrown by the master or connecting rods C - by the action of the oil control ring and the series of holes drilled in the ring groove directing oil to the pin and piston pin boss |
B - by oil which is sprayed or thrown by the master or connecting rods |
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The vent line connecting the oil supply tank and the engine in some dry sump engine installations permits A - pressurization of the oil supply to prevent cavitation of the oil pump B - oil vapors from the engine to be condensed and drained into the oil supply tank C - the oil tank to be vented through the normal engine vent |
C - the oil tank to be vented through the normal engine vent |
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An engine lubrication system pressure relief valve is usually located between the A - oil cooler and the scavenger pump B - scavenger pup and the external oil system C - pump and the internal oil system |
C - pump and the internal oil system |
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Where is the oil of a dry sump reciprocating engine exposed to the temperature control valve sensing unit? A - oil cooler inlet B - engine outlet C - engine inlet |
A - oil cooler inlet |
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Under which of the following conditions is the oil cooler flow control valve open on a reciprocating engine? A - when the temperature of the oil returning from the engine is too high B - when the temperature of the oil returning from the engine is too low C - when the scavenger pump output volume exceeds the engine pump input volume |
B - when the temperature of the oil returning from the engine is too low |
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The purpose of a relief valve installed in the tank venting system of a turbine engine oil tank is to A - prevent oil pump cavitation by maintaining a constant pressure on the oil pump inlet B - maintain internal tank air pressure at the ambient atmospheric level regardless of altitude or rate of change in altitude. C - maintain a positive internal pressure in the oil tank after shutdown to prevent oil pump cavitation on engine start |
A - prevent oil pump cavitation by maintaining a constant pressure on the oil pump inlet |
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In a reciprocating engine, oil is directed from the pressure relief valve to the inlet side of the A - scavenger pump B - oil temperature regulator C - pressure pump |
C - pressure pump |
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If the oil in the oil cooler core and annular jacket becomes congealed, what unit prevents damage to the cooler? A - oil pressure relief valve B - airflow control valve C - surge protection valve |
C - surge protection valve |
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The primary source of oil contamination in a normally operating reciprocating engine is A - metallic deposits as a result of engine wear B - atmospheric dust and pollution C - combustion deposits due to combustion chamber blow-by and oil migration on the cylinder walls |
C - combustion deposits due to combustion chamber blow-by and oil migration on the cylinder walls |
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A drop in oil pressure may be caused by A - the temperature regulator sticking open B - the bypass valve sticking open C - foreign material under the relief valve |
C - foreign material under the relief valve |
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The main oil filters strain the oil at which point in the system? A - immediately after it leaves the scavenger pump B - immediately before it enters the pressure pump C - just as it leaves the pressure pump |
C - just as it leaves the pressure pump |
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Which type valve prevents oil from entering the main accessory case when the engine is not running? A - bypass B - relief C - check |
C - check |
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An oil tank having a capacity of 5 gallons must have an expansion space of A - 2 quarts B - 4 quarts C - 5 quarts |
A - 2 quarts |
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As a general rule, a small amount of small fuzzy particles or gray metallic paste on a turbine engine magnetic chip detector A - is considered to be the result of normal wear B - indicates an imminent component failure C - indicates accelerated generalized wear |
A - is considered to be the result of normal wear |
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Why is expansion space required in an engine oil supply tank? A - to eliminate oil foaming B - for oil enlargement and collection of foam C - for proper oil tank ventilation |
B - for oil enlargement and collection of foam |
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The purpose of a dwell chamber in a turbine engine oil tank is to provide A - a collection point for sediments B - for a pressurized oil supply to the oil pump inlet C - separation of entrained air rom scavenged oil |
C - separation of entrained air rom scavenged oil |
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Which of the following bearing types must be continuously lubricated by pressure oil? A - ball B - roller C - plain |
C - plain |
