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Lubrication systems test new latest version 2024-2025 best studying material with verified, Exams of Aviation

Michigan Institute of Aviation and TechnologyAviation

1. Which of the following are the three main types of system oil filters used with turbine engines? A. Magnetic, bypass, and rotary B. Disposable paper, cleanable screen, screen and spacer C. Oil bath, mesh screen, centrifugal D. Centrifugal, cleanable screen, depth-type Correct Answer: B Rationale: These are the standard filter types used in turbine engines to remove contaminants. 2. Fine mesh screens used to strain oil just before reaching turbine engine bearings are called: A. Pre-clean filters B. Last chance filters C. Auxiliary filters D. Final flow filters Correct Answer: B Rationale: "Last chance filters" prevent debris from damaging the bearings. 3. Check valves in oil supply lines prevent oil accumulation in what area when the engine is not operating? A. Combustion chamber B. Oil cooler C. Accessory gearbox D. Oil tank Correct Answer: C Rationale: Prevents oil from pooling in the accessory gearbox and leaking.

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Lubrication systems test new latest version
2024-2025 best studying material with
verified answers graded A
1. Which of the following are the three main types of system oil filters used with turbine
engines?
A. Magnetic, bypass, and rotary
B. Disposable paper, cleanable screen, screen and spacer
C. Oil bath, mesh screen, centrifugal
D. Centrifugal, cleanable screen, depth-type
Correct Answer: B
Rationale: These are the standard filter types used in turbine engines to remove
contaminants.
2. Fine mesh screens used to strain oil just before reaching turbine engine bearings are
called:
A. Pre-clean filters
B. Last chance filters
C. Auxiliary filters
D. Final flow filters
Correct Answer: B
Rationale: "Last chance filters" prevent debris from damaging the bearings.
3. Check valves in oil supply lines prevent oil accumulation in what area when the engine
is not operating?
A. Combustion chamber
B. Oil cooler
C. Accessory gearbox
D. Oil tank
Correct Answer: C
Rationale: Prevents oil from pooling in the accessory gearbox and leaking.
4. The cockpit oil pressure gauge measures pressure at which location?
A. Upstream of the oil filter
B. At the oil pump
C. Downstream of the main oil filter
D. Inside the oil tank
Correct Answer: C
Rationale: To provide accurate readings of the oil pressure after filtering.
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Download Lubrication systems test new latest version 2024-2025 best studying material with verified and more Exams Aviation in PDF only on Docsity!

Lubrication systems test new latest version

2024 - 2025 best studying material with

verified answers graded A

  1. Which of the following are the three main types of system oil filters used with turbine engines? A. Magnetic, bypass, and rotary B. Disposable paper, cleanable screen, screen and spacer C. Oil bath, mesh screen, centrifugal D. Centrifugal, cleanable screen, depth-type Correct Answer: B Rationale: These are the standard filter types used in turbine engines to remove contaminants.
  2. Fine mesh screens used to strain oil just before reaching turbine engine bearings are called: A. Pre-clean filters B. Last chance filters C. Auxiliary filters D. Final flow filters Correct Answer: B Rationale: "Last chance filters" prevent debris from damaging the bearings.
  3. Check valves in oil supply lines prevent oil accumulation in what area when the engine is not operating? A. Combustion chamber B. Oil cooler C. Accessory gearbox D. Oil tank Correct Answer: C Rationale: Prevents oil from pooling in the accessory gearbox and leaking.
  4. The cockpit oil pressure gauge measures pressure at which location? A. Upstream of the oil filter B. At the oil pump C. Downstream of the main oil filter D. Inside the oil tank Correct Answer: C Rationale: To provide accurate readings of the oil pressure after filtering.
  1. The location of the oil temperature sensor in a turbine engine: A. Does not make a significant difference in readings B. Must be at the oil pump C. Affects accuracy greatly D. Should always be at the oil tank Correct Answer: A Rationale: Due to the oil’s circulation, sensor placement has minimal impact.
  2. A hot tank lubrication system is used when the oil cooler is located in the: A. Return subsystem B. Scavenge line C. Pressure subsystem D. Bypass line Correct Answer: C Rationale: In a hot tank system, oil is cooled after it leaves the engine.
  3. The two types of oil coolers used with aircraft gas turbine engines are: A. Water and air B. Air and fuel C. Oil and water D. Electric and manual Correct Answer: B Rationale: Air and fuel oil coolers are standard for turbine engines.
  4. Dark brown or black turbine oil with no contaminants is likely caused by: A. Dirt B. Poor filtration C. Heat D. Metal wear Correct Answer: C Rationale: Heat leads to oxidation, darkening the oil.
  5. Oil pressure adjustments on turbine engines are usually made when the engine is: A. At 75% rated thrust B. Warming up C. Idling D. Shutting down Correct Answer: C Rationale: Adjustments are typically done at idle to stabilize the system.
  6. The scavenge subsystem has a _____ capacity than the pressure subsystem. A. Lesser B. Equal C. Greater D. Constant

C. Variable viscosity D. No viscosity Correct Answer: B Rationale: High viscosity provides better lubrication under heavy loads.

  1. What does the viscosity index measure? A. Oil age B. Purity level C. Change in viscosity with temperature D. Oil thickness Correct Answer: C Rationale: Indicates how stable oil viscosity is across temperature ranges.
  2. An oil with minimal change in viscosity over temperature has a: A. Low viscosity index B. High density C. High viscosity index D. Thick composition Correct Answer: C Rationale: High index = minimal viscosity fluctuation with temp.
  3. The point at which a liquid gives off ignitable vapors is called the: A. Burn point B. Fire temperature C. Flash point D. Auto-ignition point Correct Answer: C Rationale: Flash point defines vapor ignition temperature.
  4. Aviation 80 oil has the same viscosity as SAE: A. 10 B. 30 C. 40 D. 60 Correct Answer: C Rationale: Aviation 80 matches SAE 40 viscosity.
  5. Straight mineral oil is typically used in: A. Turbine engines only B. New or newly overhauled engines C. Cold weather D. Synthetic systems Correct Answer: B Rationale: Used during engine break-in periods.
  1. Straight mineral oil lubricates _____ effectively than ashless dispersant oil. A. More B. Less C. Equally D. Better in cold Correct Answer: B Rationale: Lacks additives that enhance lubrication and cleanliness.
  2. Synthetic lubricating oils are usually: A. Single viscosity B. Low viscosity only C. Multi-viscosity D. Unusable in aviation Correct Answer: C Rationale: Designed to perform over wide temperature ranges.
  3. When incompatible oil is added to a turbine engine, what should be done? A. Mix it thoroughly B. Flush and refill the system C. Let it circulate D. Heat the oil Correct Answer: B Rationale: Prevents chemical incompatibility and engine damage.
  4. Turbine engine oils use a standard ID system? A. Yes B. No Correct Answer: B Rationale: Turbine oils are not classified by SAE numbers.
  5. SAE numbers are used for turbine oils? A. Yes B. No Correct Answer: B Rationale: SAE numbers apply to automotive/reciprocating engine oils.
  6. The two lubricating systems in reciprocating engines are: A. Oil bath and dry sump B. Wet sump and dry sump C. Closed loop and bypass D. Central and local Correct Answer: B Rationale: These are standard designs for oil circulation.
  7. Lubricating oil in a reciprocating engine is delivered via: A. Gravity

B. Full flow and bypass C. Depth and rotary D. Pressure and return Correct Answer: B Rationale: Standard filtering configurations for aircraft.

  1. Which system filters only some oil during each cycle? A. Full-flow B. Rotary C. Bypass D. Surface Correct Answer: C Rationale: Bypass filters only a portion of circulating oil.
  2. Most popular filter in general aviation is the: A. Surface filter B. Edge filter C. Semi-depth disposable filter D. Rotary screen Correct Answer: C Rationale: Common for its ease of replacement and good filtration.
  3. The Cuno filter is which type of filtration? A. Surface B. Depth C. Edge D. Bypass Correct Answer: C Rationale: Edge filtration involves scraping contaminants from rotating disks.
  4. Which valve controls oil path through the cooler? A. Check valve B. Surge protection valve C. Flow control valve D. Relief valve Correct Answer: C Rationale: Directs oil depending on temperature and need.
  5. Cold oil flows _____ the oil cooler core. A. Through B. Around C. Inside D. Beneath Correct Answer: B Rationale: Prevents excessive pressure drop during warm-up.
  1. What system aids cold starts by adding fuel to oil pre-shutdown? A. Fuel dilution B. Oil enrichment C. Oil dilution D. Carburetion aid Correct Answer: C Rationale: Reduces oil viscosity for easier engine rotation in cold.
  2. Oil pressure is measured at the _____ of the oil pump. A. Inlet B. Midpoint C. Outlet D. Bottom Correct Answer: C Rationale: Measures actual delivery pressure to the system.
  3. Which is NOT one of the six main engine oil contaminants? A. Water B. Acids C. Gasoline D. Silicone Correct Answer: D Rationale: Silicone is not a common contaminant in oil systems.
  4. When are oil coolers normally cleaned and inspected? A. Every 50 hours B. After a crash C. At engine overhaul D. During oil change Correct Answer: C Rationale: Oil coolers are deep-cleaned during major overhauls. Two methods of determining the amount of oil in a dry-sump system oil tank are:
  • ANSWER Sight gauge and dip stick. Three types of oil pumps used with a turbine engines are:
  • ANSWER Vane, Gear, and Gerotor. The gerotor pump is considered a ______ (positive or variable) displacement pump.
  • ANSWER Positive.

What component do dry-sump engines have that wet-sump engines don't have. - ANSWER Scavenge Pump Most lubrication systems include gauges to monitor what? - ANSWER Temperature and pressure An aircraft without an oil reserve or transfer system must have a fuel-to-oil ratio of at least what? - ANSWER 30: Regulations require that oil reservoirs have an expansion space at least 10 percent greater than the tank capacity or .5 gallon, whichever is greater. T or F - ANSWER True Constant displacement pumps move a fixed volume of fluid regardless of the RPM. T or F - ANSWER False The most common type of oil pump used in reciprocating engines is the gear oil pump. T or F - ANSWER True A typical gerotor pump consists of a free spinning spur gear that rotates within an engine-driven rotor housing. T or F - ANSWER False What is the purpose of a scavenge pump in a dry-sump oil system? - ANSWER To return oil to the reservoir The purpose of a pressure relief valve in the oil system, is to keep the excessive pressure generated by the oil pump at high RPM from damaging the engine. T or F - ANSWER True Most pressure relief valves are spring loaded in the open position. T or F - ANSWER False

The greater an oil pressure relief valves spring pressure, the higher the oil pressure will be. T or F - ANSWER True Where is the oil filter located within the lubrication system? - ANSWER After the oil pump Which oil filtration system filters 100 percent of the engine oil? - ANSWER both full-flow and bypass systems The filter in a full-flow oil filtration system is installed in series with the oil pump. T or F - ANSWER True When installed in a dry-sump system, the oil cooler is typically located in the oil supply line between the oil reservoir and the oil pump. T or F - ANSWER False The valve which controls the amount of oil that flows through the core of an oil cooler is known as what? - ANSWER Thermostatic control valve, bypass valve, flow control valve When replacing a disposable filter, what is common practice? - ANSWER Cut it open to inspect for metal particles To increase oil pressure you should turn the adjustment screw clockwise. T or F - ANSWER True What are the functions of lubricating oil? - ANSWER Absorbs heat, seals, cushions, cleans, protects against corrosion, reduces friction Viscosity - ANSWER a measure of oils resistance to flow Viscosity index - ANSWER Standard used to identify the rate of change in viscosity for a given change in temperature

The components that are typically lubricated by pressurized oil include: - ANSWER All plain bearings, crankshaft and camshaft main bearings, lower connecting rod bearings, valve assemblies The components that are lubricated by splashed oil include: - ANSWER Cylinder walls, camshaft lobes, upper connecting, rod bearings, piston pins, accessory gears Most surfaces inside of aircraft engines are perfectly smooth to help reduce friction and wear. T or F - ANSWER False What uses outside air to help cool engine oil? - ANSWER Oil cooler The oil film on the inside of a cylinder helps form a seal with the piston rings to prevent gas leakage during combustion T or F - ANSWER true Engine oil acts as a cleaning agent. T or F - ANSWER True The oil film that coats engine parts acts as a barrier to prevent oxygen and moisture from causing corrosion. T or F - ANSWER True All oils use the SAE rating system. T or F - ANSWER False In regards to engine oil grading, what does a "W" indicate? - ANSWER Cold weather use An SAE rating on an oil container signifies that the Society of Automotive Engineers have endorsed that oil. T or F - ANSWER False The primary purpose of a lubrication system is to deliver oil to the internal engine components. T or F - ANSWER True

All reciprocating engines use a combination of pressure, splash, and spray lubrication. T or F - ANSWER False In a pressure lubrication system, what is used to supply pressurized oil to critical engine parts? - ANSWER Positive displacement pump Splash lubrication is effective in engines where the oil is stored? - ANSWER In the crankcase Engine components that are lubricated by sprayed engine oil include cylinder walls and camshaft lobes. T or F - ANSWER True What are the two classifications of reciprocating engine lubrication systems? - ANSWER Wet and Dry sump In which oil system is oil stored in the crankcase? - ANSWER Wet-sump system In which oil system is oil stored in a separate oil reservoir? - ANSWER Dry-sump system Dry-sump systems are mostly used on small engines. T or F - ANSWER False In a dry-sump system, how is oil returned to the oil reservoir? - ANSWER Scavenge pump

  1. 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? - ANSWER *c. The oil pressure will be lower than normal.
  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, - ANSWER *a. only No. 2 is true.
  3. An oil separator is generally associated with which of the following? - ANSWER *b. Enginedriven vacuum pump.
  1. What type of oil system is usually found on turbine engines? - ANSWER *a. Dry sump, pressure, and spray.
  2. Which of the following factors helps determine the proper grade of oil to use in a particular engine? - ANSWER *c. Operating speeds of bearings.
  3. Specific gravity is a comparison of the weight of a substance to the weight of an equal volume of - ANSWER *b. distilled water at a specific temperature.
  4. Which of the following has the greatest effect on the viscosity of lubricating oil? - ANSWER *a. Temperature.
  5. What advantage do mineral base lubricants have over vegetable oil base lubricants when used in aircraft engines? - ANSWER *b. Chemical stability.
  6. The recommended aircraft engine lubricants are - ANSWER *b. mineral or synthetic based.
  7. High tooth pressures and high rubbing velocities, such as occur with spur-type gears, require the use of - ANSWER *a. an EP lubricant.
  8. Manufacturers normally require turbine engine oil servicing within a short time after engine shutdown primarily to - ANSWER *a. prevent overservicing.
  9. What type of oil do most engine manufacturers recommend for new reciprocating engine break-in? - ANSWER *b. Straight mineral oil.
  10. What type of oil do most engine manufacturers recommend after new reciprocating engine break-in? - ANSWER *b. Ashless-dispersant oil.
  1. The type of oil pumps most commonly used on turbine engines are classified as - ANSWER *a. positive displacement.
  2. As a general rule, the mixture setting on a reciprocating engine operating at or near takeoff power that provides the best cooling is - ANSWER *a. FULL RICH.
  3. The engine oil temperature regulator is usually located between which of the following on a dry sump reciprocating engine? - ANSWER *b. The scavenger pump outlet and the oil storage tank.
  4. What will happen to the return oil if the oil line between the scavenger pump and the oil cooler separates? - ANSWER *b. The return oil will be pumped overboard.
  5. 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 - ANSWER *b. lower than the pressure pump capabilities.
  6. (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, - ANSWER *c. both No. 1 and No. 2 are true.
  7. In a reciprocating engine oil system, the temperature bulb senses oil temperature - ANSWER *a. at a point after the oil has passed through the oil cooler.
  8. The oil dampened main bearing utilized in some turbine engines is used to - ANSWER *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.
  9. What is the purpose of the last chance oil filters? - ANSWER *b. To filter the oil immediately before it enters the main bearings.
  1. Possible failure related ferrous-metal particles in turbine engine oil cause an (electrical) indicating-type magnetic chip detector to indicate their presence by - ANSWER *b. bridging the gap between the detector center (positive) electrode and the ground electrode.
  2. What would be the probable result if the oil system pressure relief valve should stick in the open position on a turbine engine? - ANSWER *c. Insufficient lubrication.
  3. What is the primary purpose of the oil-to-fuel heat exchanger? - ANSWER *b. Cool the oil.
  4. What unit in an aircraft engine lubrication system is adjusted to maintain the desired system pressure? - ANSWER *a. Oil pressure relief valve.
  5. Low oil pressure can be detrimental to the internal engine components. However, high oil pressure - ANSWER *a. should be limited to the engine manufacturer's recommendations.
  6. What is the primary purpose of the oil breather pressurization system that is used on turbine engines? - ANSWER *c. Provides a proper oil spray pattern from the main bearing oil jets.
  7. The purpose of directing bleed air to the outer turbine case on some engines is to - ANSWER *a. provide optimum turbine blade tip clearance by controlling thermal expansion.
  8. Some larger reciprocating engines use a compensating oil pressure relief valve to - ANSWER *a. provide a high engine oil pressure when the oil is cold and automatically lower the oil pressure when the oil warms up.
  9. In order to relieve excessive pump pressure in an engine's internal oil system, most engines are equipped with a - ANSWER *c. relief valve.
  10. What is the source of most of the heat that is absorbed by the lubricating oil in a reciprocating engine? - ANSWER *c. Pistons and cylinder walls.
  1. How are the teeth of the gears in the accessory section of an engine normally lubricated? - ANSWER *a. By splashed or sprayed oil.
  2. What is the purpose of the check valve generally used in a dry sump lubrication system? - ANSWER *b. To prevent the oil from the supply tank from seeping into the crankcase during inoperative periods.
  3. From the following, identify the factor that has the least effect on the oil consumption of a specific engine. - ANSWER *a. Mechanical efficiency.
  4. How is the oil collected by the piston oil ring returned to the crankcase? - ANSWER *b. Through holes drilled in the piston oil ring groove.
  5. Which of the following lubrication system components is never located between the pressure pump and the engine pressure system? - ANSWER *b. Fuel line for oil dilution system.
  6. As an aid to cold-weather starting, the oil dilution system thins the oil with - ANSWER *c. gasoline.
  7. The basic oil pressure relief valve setting for a newly overhauled engine is made - ANSWER *c. in the overhaul shop.
  8. Where is the oil temperature bulb located on a dry sump reciprocating engine? - ANSWER *a. Oil inlet line.
  9. Cylinder walls are usually lubricated by - ANSWER *a. splashed or sprayed oil.