FUEL SYSTEMS

     

1. The growth rate of microbiological organisms as found in some fuel supplies will __________./increase in direct proportion to an increase in temperature

2. Which of the following statements describes the unchecked growth of microbiological organisms within a fuel system?/Corrosion of various metal components will occur due to the formation of hydrogen sulfide gas.

3. A sprayer plate marked 32Y20, as used in a return flow fuel oil system, should only be used with a/an ____________./orifice plate marked 32

4. Which of the following conditions is NOT an indication of microbial contamination of the fuel supply?/Brightening of copper bearing metals

5. Variations in the amount of fuel oil burned in a return flow type burner, are controlled by the ____________./back pressure in the fuel oil return line

6. Which chemical listed is utilized to prevent and correct most microbial infections occurring within fuel storage  systems?/Biocides

7. Proper housekeeping to prevent the formation of    microbiological growths within a fuel system includes the prevention of water accumulations and the use of _______./chemical additives called biocides

8. One function of the fuel pump delivery check valve is to _____________./help the injector needle reseat without dribbling at the nozzle holes

9. The primary function of a fuel delivery check valve assembly is to _____________./provide rapid fuel injection cutoff

10. An 8000 horsepower diesel engine has a specific fuelconsumption of 0.4 lbs. of fuel per horsepower hour. If eachpound of fuel contains 18,500 BTU's and 25% of theavailable heat leaves the engine with the exhaust, how manyBTU's per hour are theoretically a/14.8 million BTU's per hour

11. The rate of fuel injection in a diesel engine cylinder  depends primarily on _____________./the size of the holes in the fuel nozzle

12. Which of the substances listed is satisfactorily removed from the fuel by a centrifugal oil purifier?/Carbon particles

13. Some fuel injection systems utilize port-and-helix metering. Which of the following statement describes a system "timed for port closing"?/Injection has a constant beginning and variable ending.

14. When centrifuging heavy fuel oil, an important factor toconsider is the _________.I. flow rateII. viscosity of the fuel oil/both I and II are correct

15. The amount of fuel delivered for each cycle must be in  accordance with the engine load, and the same quantity of fuel must be delivered to each cylinder for each power  stroke at that load. Which of the following statements  describes this requirement?/Accurate metering

16. Fuel oil transfer systems used onboard diesel propelled  vessels are required to have _____./two fuel oil transfer pumps provided where one is to be  independent of the main engine

17. The term "proper metering", as applied to a diesel fuel  injection system, can be best defined as _____________./delivering the same quantity of fuel to each cylinder for each power stroke according to engine load

18. When fuel oil heaters are required for main engine   operation, ____________./at least two heaters of approximately equal size are to be installed

19. Regarding jerk-type fuel pumps as used on some auxiliary diesel engines, the delivery cutoff point is controlled with a _____________./helical groove on the plunger

20. Valves and fittings used with diesel engine fuel oil  pressure piping may be threaded in sizes up to and including 60 mm O.D., but screwed unions ________./are not to be used on pressure lines in sizes 33 mm O.D. and over

21. Valves used in diesel engine fuel oil pressure piping are to be _______________./so constructed as to permit packing under pressure

22. Which of the listed substances can be satisfactorily removed from diesel fuel by centrifuging?/Sludge

23. Which of the following statements is correct concerning  ABS rules for fuel oil injection systems as found on diesel propelled vessels?/Cut-out valves are to be located at the service tanks and be so arranged as to be operable from the engine room floor plates.

24. Which of the following manufacturing methods is recommended for diesel engine fuel injection line piping?/Seamless drawn

25. What type of fitting is to be used on diesel engine fuel injection line piping?/Extra heavy

26. The ability of a fuel particle to travel into the combustion chamber before burning is called _____________./penetration

27. Which of the following statements is an accurate description of fuel injection piping used on diesel engines with a  cylinder bore of 250 mm and above?/The piping is to be effectively shielded and secured to  prevent fuel or fuel mist from reaching a source of   ignition on the engine or its surroundings.

28. If the peak to peak pressure pulsation in the diesel engine fuel injection return piping exceeds 285 psi what special provision is to be provided?/The piping shall be shielded and secured to prevent fuel or fuel mist from reaching a source of ignition on the engine or its surroundings.

29. In a diesel engine mechanical-type fuel pump, the delivery check valve is opened by ____________./hydraulic action

30. What is the term given to the process of breaking up fuel oil into very fine particles for better combustion?/Atomizing

31. Diesel engine fuel oil leakage should be drained and  additional precautions provided to __________./prevent contamination of lubricating oil by fuel oil

32. When is fuel injected into a cylinder of diesel engines?/After air in the cylinder is compressed.

33. Proper dispersion of fuel in a diesel engine cylinder is dependent upon the _____________./all of the above

34. Diesel fuel oil having a low cetane rating can result in _____________./combustion knock

35. The minimum fuel oil delivery pressure required for   efficient injection depends primarily on the ______________./maximum pressure in the engine cylinders during injection

36. Proper filtering and straining of diesel fuel is important because the _____________./fuel injectors may be damaged by foreign particles in the fuel oil

37. In the Otto cycle, the fuel/air mixture is ignited at what point and by what means?/Just before TDC by spark ignition.

38. Fuel is ignited in a diesel engine cylinder by ____________./the heat of compression

39. In a diesel engine, the time taken to heat the fuel   particles, turn them into vapor, and bring about combustion is called _____________./ignition delay

40. Persistent knocking of one cylinder of a diesel engine  ceases when the fuel supply to that cylinder is secured. This problem may be a result of ______________./faulty combustion in that cylinder

41. The efficient burning of fuel in a diesel engine is   dependent upon the _____________./all of the above

42. One cylinder of a diesel engine is persistently knocking and does not cease when the fuel supply to that cylinder is  secured. Which of the following problems may be the cause?/A mechanical defect in a working part

43. What causes diesel fuel to be ignited in the cylinder of an operating diesel engine?/Heat of compression

44. A practical way of checking for excessive fuel injection in one cylinder of an operating diesel engine is to   _____________./frequently check the cylinder exhaust temperature

45. Modern marine diesel engines using mechanical fuel   injection, operate on a combustion cycle which is _________./a combination of constant volume and constant pressure

46. Modern marine diesel engines equipped with mechanical fuel injection operate on a combustion phase within the cycle which is _________./a combination of constant volume and constant pressure

47. Which of the following statements describes the results of excessive microbiological growths within a fuel system?/The deposits produced by these growths form blockages and flow restrictions ultimately leading to improper atomization of the fuel into the cylinders.

48. Significant retardation of a diesel engine fuel injection timing will result in _____________./reduced engine power

49. Late fuel oil injection in a diesel engine can result in _____________./high exhaust temperature

50. When fuel is injected late into a diesel engine cylinder, _____________./fuel consumption will be high

51. When using a fuel with a higher than normal sulfur content in an auxiliary diesel engine, you should _____________./change the lube oil more frequently than normal

52. In a diesel engine, late fuel injection is indicated by  black or gray exhaust smoke with ______________./low firing pressure

53. A diesel engine will lose power if fuel injection occurs too late in the cycle, because the ______________./maximum expansion of the burned fuel cannot take place in the cylinder

54. Late fuel injection timing is indicated by ____________./lower than normal cylinder pressure and high exhaust  temperature

55. Late fuel injection in a diesel engine is indicated by low firing pressure with _____________./high exhaust temperature

56. The microbiological growths that affect fuel supplies can easily be transported from one location to another by  _________./air, solids, or liquids

57. Late fuel injection occurring at, or after TDC in a diesel engine is indicated by excessive exhaust smoke and   _____________./low firing pressure

58. Late fuel injection in a diesel engine is indicated by low firing pressure with _____________./black or gray exhaust smoke

59. Late fuel injection in a diesel engine is indicated byblack or gray exhaust smoke with a _____________./low firing pressure

60. The sludge tank installed in the diesel engine room is used to collect _____________. I. sludge from the fuel oil settling tanks and  centrifuge II. water that has been collected in the settling tank./both I and II

61. The major cause of problems occurring with fuel injection equipment is _____________./dirt in the fuel

62. Which of the following problems is the main source of fuel pump and injection system malfunctions?/Improper adjustments

63. Fuel oil strainers should be made of ____________.  I. copper  II. brass/neither I nor II

64. A dirty fuel oil filter is can be detected by ________.  I. fuel oil analysis  II. observing the pressure drop across the filter/II only

65. When fuel is injected too early in the injection cycle, it may cause the engine to have _____________./early detonation and a loss of power

66. Early fuel injection timing is indicated by the cylinder pressure being _____________./above normal with a below normal exhaust temperature

67. When fuel is injected in a diesel engine cylinder too  early, _____________./ignition may be delayed

68. Which of the listed set of conditions indicates early fuel injection timing?/Higher than normal firing pressure and low exhaust   temperature

69. A diesel engine will lose power if fuel injection occurs too early because the _____________./ignition will be delayed due to low ignition temperature

70. Modern marine diesel engines equipped with mechanical fuel injection operate on a combustion cycle which is _________./a combination of constant volume and constant pressure

71. A fuel injection valve opening at a pressure lower than  normal will result in _____________./early fuel injection

72. If fuel injection occurs too early, a diesel engine will lose power because the _____________./ignition will be delayed due to low compression pressure

73. Due to excessive water in the fuel, a diesel engine fails to start. Before the engine can be started, the water must be removed from the ____________./all of the above

74. A diesel engine fails to start due to excessive water in the fuel. Before the engine can be started, the water should be removed from the _____________./fuel lines