meSkipper

Lubrication and oil — Engineering, Mashit 30

21 questions on lubrication and oil, from the Engineering exam of Mashit 30. Oil pressure, oil level, filters and lubrication faults. Every question is shown with its correct answer, as in the official question pool.

Practise by topic · All 178 Engineering questions · Mock exam

Questions on Lubrication and oil

  1. How is pressure lubrication carried out? By an oil pressure pump.
  2. Where in the engine is the oil pressure measured? After the oil filter.
  3. Where is the oil collected in a diesel engine? In the sump.
  4. What does "milky oil" (an emulsion) in the engine indicate? Water in the oil.
  5. Why is the oil pressure high just after the engine is started? The oil is cold and more viscous.
  6. When is the oil pressure higher? When the engine is started from cold.
  7. What is the main job of the oil in the engine? To reduce wear and friction.
  8. How can you check the amount of oil in the sump? With the dipstick.
  9. How are the engine parts lubricated in a two-stroke petrol outboard engine? By oil mixed with the fuel.
  10. What colour of engine oil shows that water has got into it? Whitish.
  11. What can a rise in the oil level in the sump indicate? Fuel getting into the oil.
  12. After running under load, while you are coming alongside the quay and have reduced the engine rpm, the oil pressure warning comes on. What should you do? Finish mooring quickly and then stop the engine.
  13. While checking the engine oil you find it is black. What should you do? Nothing: one of the oil's jobs is also to absorb soot particles.
  14. Why does every engine lose lubricating oil as it runs? Because some of the oil that lubricates the piston rings is eventually burnt.
  15. When should the engine oil level be checked? Before starting the engine.
  16. What are the functions of the oil in the engine? All of the above.
  17. What can cause "thin oil" in an engine? Fuel getting into the oil.
  18. What symptoms result from a dirty oil filter? A drop in oil pressure.
  19. What should you do if the low oil pressure warning comes on? Stop the engine immediately.
  20. When will the oil pressure be lower than normal? When there is not enough oil in the system.
  21. What is the role of the lubricating oil in the engine? All of the above.

More Engineering topics

This page is part of the practice for Mashit 30. The site also has mock exams built like the theory exam, practice by topic and a weakness analysis — free, with no sign-up.