Lubrication systems test new latest version 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. 5. 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. 6. 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. 7. 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. 8. 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. 9. 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. 10. The scavenge subsystem has a _____ capacity than the pressure subsystem. A. Lesser B. Equal C. Greater D. Constant Correct Answer: C Rationale: It must return oil quickly and remove excess efficiently. 11. Magnetic chip detectors are usually located in which subsystem? A. Pressure B. Fuel C. Scavenge D. Cooling Correct Answer: C Rationale: Scavenge lines carry oil back from the engine, picking up particles. 12. The Electric Pulsed Chip Detector can: A. Only detect oil level B. Discriminate between small and large particles C. Only detect metal D. Clean itself Correct Answer: B Rationale: These advanced detectors identify severity based on particle size. 13. Which is NOT a function of oil in an engine? A. Corrodes metal B. Cools C. Seals and cushions D. Reduces friction Correct Answer: A Rationale: Oil prevents corrosion and provides multiple protective roles. 14. The resistance of an oil to flow is known as: A. Viscosity B. Density C. Pressure D. Purity Correct Answer: A Rationale: Viscosity measures oil's flow resistance. 15. Oil that flows easily has a: A. High viscosity B. Medium viscosity C. Low viscosity D. No viscosity Correct Answer: C Rationale: Lower viscosity means less resistance to flow. 16. Reciprocating engines use oil with: A. Low viscosity B. High viscosity C. Variable viscosity D. No viscosity Correct Answer: B Rationale: High viscosity provides better lubrication under heavy loads. 17. 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. 18. 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. 19. 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. 20. 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. 21. 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. 22. 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. 23. 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. 24. 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. 25. Turbine engine oils use a standard ID system? A. Yes B. No Correct Answer: B Rationale: Turbine oils are not classified by SAE numbers. 26. SAE numbers are used for turbine oils? A. Yes B. No Correct Answer: B Rationale: SAE numbers apply to automotive/reciprocating engine oils. 27. 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. 28. Lubricating oil in a reciprocating engine is delivered via: A. Gravity B. Pressure, splash, combination C. Manual pump D. Vapor pressure Correct Answer: B Rationale: Different methods are used based on component needs. 29. Disadvantages of a wet-sump system include: A. Low oil pressure B. Limited size, poor cooling C. High maintenance D. Requires multiple pumps Correct Answer: B Rationale: Wet sump is compact but limits oil volume and cooling. 30. Oil filler caps must be marked with: A. Serial number and date B. Oil type and part number C. "Oil" and tank capacity D. "Caution" and temperature rating Correct Answer: C Rationale: For proper oil selection and filling. 31. Oil tanks for hydromatic props leave a reserve for: A. Emergency cooling B. Propeller feathering C. Engine restart D. Fuel mixing Correct Answer: B Rationale: Ensures there's oil to feather the propeller in failure. 32. A gear-type oil pump is what kind of pump? A. Variable displacement B. Centrifugal C. Constant displacement D. Vacuum-driven Correct Answer: C Rationale: It displaces a fixed volume per revolution. 33. Constant-displacement pumps require a relief valve? A. No B. Yes Correct Answer: B Rationale: To prevent overpressure in the oil system. 34. Two types of oil filter systems are: A. Centrifugal and magnetic B. Full flow and bypass C. Depth and rotary D. Pressure and return Correct Answer: B Rationale: Standard filtering configurations for aircraft.