LUBRICATING SYSTEM A&P FAA

1. Which of these characteristics is desirable in turbine engine oil? A- Low flash point B- High flash point C- High volatility. B. B.

1. The type of oil pumps most commonly used on turbine engines are classified as. positive displacement. positive displacement.

1. What is the source of most of the heat that is absorbed by the lubricating oil in a reciprocating engine?. pistons and cylinder walls. pistons and cylinder walls.

1. What will happen to the return oil if the oil line between the scavenger pump and the oil cooler separates?. the return oil will be pumped overboard. the return oil will be pumped overboard.

The vent line connecting the oil supply tank and the engine in some dry sump engine installations permits... the oil tank to be vented through the normal engine vent. the oil tank to be vented through the normal engine vent.

1. What determines the minimum particle size which will be excluded or filtered by a cuno-type (stacked disc, edge filtration) filter?. the spacer thickness. the spacer thickness.

The main oil filters strain the oil at which point in the system?. just as it leaves the pressure pump. just as it leaves the pressure pump.

1. The basic oil pressure relief valve setting for a newly overhauled engine is made... in the overhaul shop. in the overhaul shop.

1. The oil used in reciprocating engines has a relatively high viscosity due to... large clearances and high operating temperatures. large clearances and high operating temperatures.

Manufacturers normally require turbine engine oil servicing within a short time after engine shutdown primarily to... prevent over-servicing. prevent over-servicing.

1. A drop in oil pressure may be caused by... foreign material under the relief valve. foreign material under the relief valve.

Excessive oil is prevented from accumulating on the cylinder walls of a reciprocating engine by... oil control rings on the pistons. oil control rings on the pistons.

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. 1, 2, 3, 4, 5. 1, 2, 3, 4, 5.

The primary source of oil contamination in a normally operating reciprocating engine is... combustion deposits due to combustion chamber blow-by and oil migration on the cylinder walls. combustion deposits due to combustion chamber blow-by and oil migration on the cylinder walls.

Where are sludge chambers, when used in aircraft engine lubricating systems, usually located?. in the crankshaft throws. in the crankshaft throws.

Possible failure related ferrous-metal particles in turbine engine oil cause an (electrical) indicating-type magnetic chip detector to indicate their presence by... bridging the gap between the detector center electrode and the ground electrode. bridging the gap between the detector center electrode and the ground electrode.

Which of the following bearing types must be continuously lubricated by pressure oil?. plain. plain.

The purpose of directing bleed air to the outer turbine case on some engines is to... provide optimum turbine blade tip clearance by controlling thermal expansion. provide optimum turbine blade tip clearance by controlling thermal expansion.

The valve assemblies of opposed reciprocating engines are lubricated by means of a... pressure system. pressure system.

According to the FAR, oil tank fillers on turbine engines must be marked with the word... oil. oil.

If the oil in the oil cooler core and annular jacket becomes congealed, what unit prevents damage to the cooler?. surge protection valve. surge protection valve.

Why is expansion space required in an engine oil supply tank?. for oil enlargement and collection of foam. for oil enlargement and collection of foam.

A turbine engine dry sump lubrication system of the self-contained, high-pressure design...(consists of....). consists of pressure, breather, and scavenge subsystems. consists of pressure, breather, and scavenge subsystems.

Oil picks up the most heat from which of the following turbine engine components?. turbine bearing. turbine bearing.

Lubricating oils with high viscosity index ratings are oils... in which the viscosity does not vary much with temperature change. in which the viscosity does not vary much with temperature change.

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... oil through the heat exchanger. oil through the heat exchanger.

Why are fixed orifice nozzles used in the lubrication system of gas turbine engines?. to provide a relatively constant oil flow to the main bearings at all engine speeds. to provide a relatively constant oil flow to the main bearings at all engine speeds.

An oil separator is generally associated with which of the following? A- Engine driven oil pressure pump B- Engine driven vacuum pump C- Cuno oil filter. B. B.

What type of oil do most engine manufacturers recommend after new recip engine break-in?. ashless-dispersant oil. ashless-dispersant oil.

An engine lubrication system pressure relief valve is usually located between the... pump and the internal oil system. pump and the internal oil system.

How are the piston pins of most aircraft engines lubricated?. by oil which is sprayed or thrown by the master or connecting rods. by oil which is sprayed or thrown by the master or connecting rods.

After making a welded repair to a pressurized-type turbine engine oil tank, the tank should be pressure checked to... not less than 5 psi plus the max operating pressure of the tank. not less than 5 psi plus the max operating pressure of the tank.

What is the primary purpose of the hopper located in the oil supply tank of most dry sump engine installations?. to reduce the time required to warm the oil to operating temperatures. to reduce the time required to warm the oil to operating temperatures.

What will result if an oil filter becomes completely blocked?. oil will flow at the normal rate through the system. oil will flow at the normal rate through the system.

Specific gravity is a comparison of the weight of a substance to the weight of an equal volume of... distilled water at a specific temperature. distilled water at a specific temperature.

(1) Gas turbine and recip engine oils can be mixed or used interchangeably (2) Most gas turbine engine oils are synthetic Regarding the above statements, only number 2 is true. only number 2 is true. only number 2 is true.

The purpose of a relief valve installed in the tank venting system of a turbine engine oil tank is to... prevent oil pump cavitation by maintaining a constant pressure on the oil pump inlet. prevent oil pump cavitation by maintaining a constant pressure on the oil pump inlet.

Lube system last chance filters in turbine engines are usually cleaned... during overhaul. during overhaul.

Under which of the following conditions is the oil cooler flow control valve open on a recip 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. B.

The pumping capacity of the scavenger pump in a dry sump aircraft engine's lubrication system... is greater than the capacity of the oil supply pump. is greater than the capacity of the oil supply pump.

Low oil pressure can be detrimental to the internal engine components. However, high oil pressure... should be limited to the engine manufacturers recommendations. should be limited to the engine manufacturers recommendations.

An oil tank having a capacity of 5 gallons must have an expansion space of... 2 quarts. 2 quarts.

What is the primary purpose of changing aircraft engine lubricating oils at predetermined periods?. the oil becomes contaminated with moisture, acids, and solid particles. the oil becomes contaminated with moisture, acids, and solid particles.

What is the purpose of the check valve generally used in a dry sump lubrication system?. to prevent the oil from the supply tank from seeping into the crankcase during inoperative periods. to prevent the oil from the supply tank from seeping into the crankcase during inoperative periods.

What unit in an aircraft engine lubrication system is adjusted to maintain the desired system pressure?. oil pressure relief valve. oil pressure relief valve.

If all other requirements can be met, what type of oil should be used to achieve theoretically perfect engine lubrication?. the thinnest oil that will stay in place and maintain a reasonable film strength. the thinnest oil that will stay in place and maintain a reasonable film strength.

How is the oil collected by the piston oil ring returned to the crankcase?. through holes drilled in the piston oil ring groove. through holes drilled in the piston oil ring groove.

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... lower than the pressure pump capabilities. lower than the pressure pump capabilities.

In an axial-flow turbine engine, compressor bleed air is sometimes used to aid in cooling the... turbine, vanes, blades, and bearings. turbine, vanes, blades, and bearings.

What prevents pressure within the lubricating oil tank from rising above or falling below ambient pressure (recip engine)?. oil tank vent. oil tank vent.

Cylinder walls are usually lubricated by. splashed or sprayed oil. splashed or sprayed oil.

The engine oil temperature regulator is usually located between which of the following on a dry sump reciprocating engine?. the scavenger pump outlet and the oil storage tank. the scavenger pump outlet and the oil storage tank.

Oil accumulation in the cylinders of an inverted in-line engine and in the lower cylinders of a radial engine is normally reduced or prevented by... extended cylinder skirts. extended cylinder skirts.

Where is the oil of a dry sump recip engine exposed to the temperature control valve sensing unit?. oil cooler inlet. oil cooler inlet.

Which type of valve prevents oil from entering the main accessory case when the engine is not running?. Check. Check.

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... remains relatively constant with less oil being returned to the pump inlet by the relief valve. remains relatively constant with less oil being returned to the pump inlet by the relief valve.

In a recip engine oil system, the temperature bulb senses oil temperature... at a point after the oil has passed through the oil cooler. at a point after the oil has passed through the oil cooler.

Oil tank fillers on recip engines are marked with the word... oil in accordance with 14 cfr part 23. oil in accordance with 14 cfr part 23.

The viscosity of a liquid is a measure of its... resistance to flow. resistance to flow.

As an aid to cold-weather starting, the oil dilution system thins the oil with... Gasoline. Gasoline.

The oil dampened main bearing utilized in some turbine engines is used to... provide an oil film between the outer race and the bearing housing in order to reduce vibration tendencies in the rotor system. provide an oil film between the outer race and the bearing housing in order to reduce vibration tendencies in the rotor system.

What advantage do mineral base lubricants have over vegetable oil base lubricants when used in aircraft engines?. chemical stability. chemical stability.

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?. the oil pressure will be lower than normal. the oil pressure will be lower than normal.

(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... only number 2 is true. only number 2 is true.

In a recip engine, oil is directed from the pressure relief valve to the inlet side of the... pressure pump. pressure pump.

(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... both number 1 and 2 are true. both number 1 and 2 are true.

If an oil filter element becomes completely clogged, the... bypass valve will open and the oil pump will supply unfiltered oil to the engine. bypass valve will open and the oil pump will supply unfiltered oil to the engine.

What type of oil system is usually found on turbine engines?(3). dry sump, pressure, and spray. dry sump, pressure, and spray.

As a general rule, a small amount of small fuzzy particles or gray metallic paste on a turbine engine magnetic chip detector... is considered to be the result of normal wear. is considered to be the result of normal wear.

What type of oil do most engine manufacturers recommend for new recip engine break-in?. straight mineral oil. straight mineral oil.

Which of the following has the greatest effect on the viscosity of lubricating oil? A- Temperature B- Engine RPM C- System pressure. A. A.

In which of the following situations will the oil cooler automatic bypass valve be open the greatest amount?. engine oil below normal operating temperature. engine oil below normal operating temperature.

The purpose of a dwell chamber in a turbine engine oil tank is to provide... separation of entrained air from scavenged oil. separation of entrained air from scavenged oil.

As a general rule, the mixture setting on a recip engine operating at or near takeoff power that provides the best cooling is... full rich. full rich.

What is the primary purpose of the oil breather pressurization system that is used on turbine engines?. provides a proper oil spray pattern from the main bearing oil jets. provides a proper oil spray pattern from the main bearing oil jets.

Some larger recip engines use a compensating oil pressure relief valve to... provide a high engine oil pressure when the oil is cold and automatically lower the oil pressure when the oil warms up. provide a high engine oil pressure when the oil is cold and automatically lower the oil pressure when the oil warms up.

The purpose of the flow control valve in a recip engine oil system is to... direct oil through or around the oil cooler. direct oil through or around the oil cooler.

What is the primary purpose of the oil-to-fuel heat exchanger?. cool the oil. cool the oil.

The 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... Viscosity. Viscosity.

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. B.

In order to relieve excessive pump pressure in an engine's internal oil system, most engines are equipped with a... relief valve. relief valve.

Compared to recip engine oils, the types of oils used in turbine engines... have less tendency to produce lacquer or coke 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. C.

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. C.

How are the teeth of the gears in the accessory section of an engine normally lubricated?. by splashed or sprayed oil. by splashed or sprayed oil.

Upon what quality or characteristic of a lubricating oil is its viscosity index based?. its rate of change in viscosity with temperature change. its rate of change in viscosity with temperature change.

The recommended aircraft engine lubricants are... mineral or synthetic based. mineral or synthetic based.

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. A.

What is the purpose of the last chance oil filters?. to filter the oil immediately before it enters the main bearings. to filter the oil immediately before it enters the main bearings.

Where is the oil temperature bulb located on a dry sump recip engine?. oil inlet line. oil inlet line.

High tooth pressures and high rubbing velocities, such as occur with spur-type gears, require the use of... an EP lubricant. an EP lubricant.

What would be the probable result if the oil system pressure relief valve should stick in the open position on a turbine engine?. insufficient lubrication. insufficient lubrication.

Why is an aircraft recip engine oil tank on a dry sump lubrication system equipped with a vent line?. to prevent pressure buildup in the oil tank. to prevent pressure buildup in the oil tank.