LUBRICATION

         

           

1. The lube oil cooler is located after the lube oil filter in order for _____________./the filter to operate more efficiently

2. With respect to the flow of lubricating oil through a diesel engine, the lube oil coolers are located after filters in order to _____________./all of the above

3. Passages are drilled in the crankshafts of diesel engines to provide lubricating oil to the _____________./All of the above

4. Lubricating systems for diesel engines are usually designed to initially provide lube oil to the engine _____________./main bearings

5. The rate of cylinder lubricating oil metered to eachcylinder of a large, low-speed, main propulsion diesel  engine is ______________./higher at sea than while maneuvering

6. Lubrication for the main reduction gears used with diesel engines is usually supplied by _____________./an independent lube oil system

7. Mechanical lubricators for diesel engine cylinders are  usually small reciprocating pumps which are _____________./adjustable to meet lubrication requirements

8. Cylinder lubrication oil for low speed main propulsion  diesel engines is admitted to each cylinder during   _____________./the compression stroke

9. If the chemical analysis of a lube oil sample taken from adiesel engine indicates an increased neutralization number the _________./acidity has increased

10. Which of the following devices is normally provided to  prevent oil starvation in a diesel engine lubrication system utilizing the "full flow" principle?/Pressure relief bypass line around the filter

11. Corrosion inhibitors and/or soluble oils are added to diesel engine cooling systems to _____________./form a protective film on metal surfaces

12. A spring-loaded relief valve is located on some lube oil filters in full flow systems to _____________./bypass the filter should it become clogged

13. If the cooling water temperature and the lube oil   temperature in a diesel engine are too high, the cause can be _____________./excessive wear of the cooling water pump

14. Most large, low-speed, main propulsion diesel engines use duplex lube oil strainer to _____________./ensure a positive flow of oil at all times

15. Where may a strainer be located in a diesel engine lubricating oil system?/In any combination of the above.

16. Unusually low oil pressure in the lube oil header of a  diesel engine is the result of a/an ____________./air leak in the oil pump suction line

17. Loss of lubricating oil pressure to the main propulsion  diesel engine will actuate a/an _____________./audible/visual alarm

18. In a normally operating diesel engine, the main source of lubricating oil contamination in the crankcase is a result of the ______________./breakdown of the lubricating oil itself

19. On small diesel engines, a noticeable decrease in the time interval between the replacement of the lube filter   cartridge indicates ____________./piston ring blow-by

20. Which of the following statements concerning the lubrication of diesel propulsion engines used in vessels over 300 gross tons is most accurate?/When forced lubrication is used for propulsion engines, one independently driven stand-by pump is to be provided in  addition to the necessary pumps for normal operation.

21. The pressure differential across a diesel engine lube oil system duplex filter should be checked to _________./determine the need for filter cleaning

22. What could cause the bypass valve in a full-flow lubrication system to open?/Clogged filter element

23. Where the size and design of an engine is such that   lubrication before starting is not necessary and an attached pump is normally used, _____________./an independently driven stand-by pump is not required if a complete duplicate of the attached pump is carried as a  spare

24. Before starting a diesel engine that has an engine driven lube oil pump, the engineer should _____________./pressurize the lube oil system

25. In a diesel engine lube oil system, which of the following parts should be lubricated first?/Main bearings

26. A diesel engine using lube oil with too high a viscosity will exhibit _____________./increased starting difficulty in cold weather

27. Scale and dirt accumulation in the waterside of a lube oil cooler will be indicated by a gradual increase in the lube oil ____________./temperature

28. In a bypass type lubrication system for a diesel engine, the dirty oil line to the centrifuge should be taken from the _____________./bottom of the lube oil sump

29. To manually bypass a strainer or filter in a shunt type lube oil filtering system, _____________./turn the three-way valve

30. A dirty lube oil strainer can result in _____________./low bearing oil pressure

31. In a full flow type lube oil system, the bypass relief valve will lift due to _____________./a clogged filter element

32. In a diesel engine, crosshatch on the liner surface aids in___________.I. rapid ring seatingII. the retention of lube oil/both I and II are correct

33. To determine if the lube oil filter elements need changing, ________________./check the pressure drop across the filter

34. Many lube oil filters have pressure gages installed on both the inlet and outlet in order to indicate the pressure drop across the filter. In normal operation, the pressure drop will _____________./slowly increase

35. Lube oil cannot be efficiently filtered if its ____________./temperature is too low

36. Lube oil filters remove contaminants from oil more   efficiently if the oil being filtered is _____________./heated to reduce viscosity

37. Lube oil filters remove contaminants more efficiently if the oil being filtered is _____________./heated to reduce viscosity

38. Lube oil accumulating in the cooling water system of a  diesel engine will result in _____________./poor heat transfer

39. Engine coolant accumulating in the diesel engine lubricating oil can result from a _____________./cracked cylinder head or liner

40. To properly clean the disks of a metal-edge type strainer in a diesel engine lube oil system, you should _____________./rotate the T-handle spindle one turn

41. To routinely clean a metal-edge type lube oil strainer, you should _____________./rotate the disc element and drain off the sediment

42. The metal edge type filters used in diesel engine fuel oil and lube oil systems are normally cleaned in place by  _____________./manually operating a built-in scraper and draining the  filter

43. A "Blotter test" is performed on the lube oil of a diesel engine to determine the _________./relative detergency remaining

44. Diesel engine lube oil diluted with fuel oil is indicated by _____________./decreased viscosity

45. When excessive fuel dilution is noted in the lube oil, the oil should be _____________./changed

46. Which of the listed cylinder liner surface conditions  indicates proper lubrication?/Bright appearance.

47. When fuel oil has seriously contaminated a diesel engine lubricating oil, you should ____________./drain and then renew the lube oil supply

48. A decrease in the flash point of diesel engine lube oil  indicates the lube oil has become _____________./diluted with fuel oil

49. If a used lube oil analysis indicates excessive fuel  dilution, the lube oil should be _____________./changed

50. A "detergent-type" lube oil, used in a diesel engine, should be replaced when _____________./fuel oil dilution is 5%

51. Which of the following test points should be considered a determining factor as to whether or not a diesel generator's lube oil should be drained and renewed?/An extremely high precipitation number.

52. How often should the lubricating oil of a diesel engine be changed?/According to manufacturer's instructions

53. If the detergent type lubricating oil being used in a diesel engine is black, the oil _____________./is holding finely dispersed carbon in suspension

54. Coast Guard Regulations (46 CFR) require emergency diesel generator sets, with forced lubrication systems, to be  provided with a _____________./low lube oil pressure alarm system

55. Which of the following conditions is indicated when the  lubricating oil of a diesel engine turns dark after a few hours of use?/The oil is functioning normally.

56. Oil oxidation, as a result of excessively high lube oil  temperature, is harmful to a diesel engine because   _____________./corrosive by-products are usually formed

57. The oxidation by-products forming in diesel engine lube oil can cause _____________./All of the above

58. Which of the following operational conditions will occur to the diesel engine lube oil at extremely high temperatures?/The oil oxidizes and forms carbon deposits.

59. Which of the listed conditions can cause a diesel engine to use too much lube oil?/Too much piston ring wear

60. Excessive lube oil consumption in a diesel engine can be caused by _____________./plugged oil wiper rings