Universiti Kuala Lumpur
Malaysian Institute of Aviation Technology
RECIPROCATING ENGINE LUBRICATION SYSTEM
QUIZ 1
1. Describe a lubricant.
2. What are the principle properties of aircraft engine oil?
3. Define term ‘flash point’.
4. Define viscosity.
5. What is meant by the term ‘viscosity index’?
6. What are the determining factors in selecting a grade of lubricating oil to be used
in aircraft engine?
7. Why is engine oil with comparatively high-viscosity required for aircraft engine?
8. Define term ‘fire point’.
9. What are the principle functions of lubricating oil in engine?
10. What is meant by ‘ashless dispersant’?
11. What are the advantages of multi-viscosity oil?
12. What is meant by pressure lubrication?
13. Describe the operation of oil temperature regulator?
14. What is the function of oil system relief valve?
15. What inspection should be made with respect to engine when oil filter is
serviced?
16. What designed feature is incorporated to prevent a clogged filter from restricting
oil flow?
17. What is the purpose of oil separator?
18. Differentiate between ‘wet-sump’ and ‘dry-sump’ system.
19. Where is the oil temperature sensor placed in engine lubrication system?
20. What is the purpose of ‘oil dilution’ system?
21. Why is the capacity of the scavenge pump in dry-sump oil system greater than
the pressure pump?
22. What happen to the excess oil supplied by the pressure pump?
23. Aircraft lubrication systems are normally classified into which two categories?
24. What is the purpose of hopper in an oil tank?
25. Oil filler caps should contain what marking? Why?
26. Four base of lubricants used to reduce friction between moving parts are?
27. One of the problems with using animal-base lubricants in aircraft engine is that
they become ___________________ at high temperatures.
28. Two bases for mineral oils used in aircraft engines are?
29. Six types of oil that are or have been used in the aircraft engines are?
30. The type of oil recommended by most engine manufacturer for use during the
initial break-in period is _________________ oil.
31. Detergent oils _______________ (are/are not) one of the more popular lubricants for
use in modern aircraft engines.
32. The most popular lubricating oil for use in modern aircraft engine is a/an _________
oil.
33. The measure of the resistance of a liquid to flow is called its _______________.
34. The measure of the relationship between the changes in the viscosity of a liquid
to a change in its temperature is the _______________ of the liquid.
35. An oil with a high viscosity index, changes its viscosity very ______________
(little/much) with changes in temperature.
36. A multi-viscosity oil is one that has a/an ______________ additive mixed with it.
37. Two advantages of synthetic oil for use in reciprocating engines are?
38. The type of lubricant needed when there is a high tooth pressure or a high
rubbing velocity is an/a ____________ lubricant.
39. It ________ (is/is not) a recommend procedure to mix automotive oil with aviation
oil if they have the same SAE number.
40. It ________ (is/is not) a recommend procedure to use turbine engine oil in a
reciprocating engine.
41. The number of seconds required for exactly 60 cc of heated oil to flow through a
calibrated orifice in a viscosimeter is the ________________ of the oil at that
temperature.
42. The SSU viscosity of a lubricating oil as measured at 210°F is used as the basic for
the _________________ (commercial aviation /SAE) rating of the oil.
43. SAE 40 engine oil has the same viscosity of commercial aviation grade _________
oil.
44. An ideal engine lubricating oil is one with as ___________ (high/low) a viscosity as
possible consistent with a high film strength.
45. The temperature at which the wax in an oil first become visible is called the ______
point.
