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1. When conducting a borescope inspection of the compressor, why can Airfoil and tip cracks be difficult to detect?

 
 
 
 

2. When inspecting the combustion section of a gas turbine engine, what wattage light source should you use?

 
 
 
 

3. When dissimilar metals come in contact with a conductor, which of the following types of metal deterioration takes place?

 
 
 
 

4. A reddish -colored oxide usually forms on which of the following metals?

 
 
 
 

5. (3.10.9.0-3) A white-gray powdery deposit can usually found on which of the following metals?

 
 
 
 

6. Active corrosion on copper alloys is indicated by which of the following?

 
 
 
 

7. Cadmium and zinc coatings provide which of the following types of protection for the base metal?

 
 
 
 

8. Compressor tip clang can be usually attributed to which of the following operating conditions?

 
 
 
 

9. Compressor rotor blade tip curl is usually caused by which of the following?

 
 
 
 

10. Once a compressor is broken in, which of the following factors will most likely cause blade tips to rub?

 
 
 
 

11. You are conducting a borescope inspection of the compressor section of a LM2500 gas turbine. In stage four, you see a slight tilt to one blade and the blade platform is raised higher than the other blades. What could be a cause of this condition and what would be your course of action?

 
 
 
 

12. A compressor blade platform that is tilted or raised may indicate which of the following failures?

 
 
 
 

13. When tip clang takes place on a GTE, the major damage occurs to what area of the blade?

 
 
 
 

14. You are conducting a borescope inspection of the combustor section of a LM2500 gas turbine engine. You observe a one square inch hole in the combustor dome where burn through has removed the metal. What would be your course of action?

 
 
 
 

15. The dimples of a combustor dome band that has a low operating time will usually have what kind of damage?

 
 
 
 

16. Distortion of the combustor liner assembly is evident when you observe which of the following conditions?

 
 
 
 

17. Which of the following is the most probable cause if, while underway, the main propulsion gas turbine air intake blow-in doors open?

 
 
 
 

18. While underway on a ship with gas turbine engines, the most likely indication of an engine stall is _________.

 
 
 
 

19. In which of the following ways can compressor surge cause excessive temperatures in the turbine section?

 
 
 
 

20. If a fire is detected in a main propulsion gas turbine enclosure, which of the following would occur prior to automatic release of the fire extinguishing agent?

 
 
 
 

21. If after reducing power to a GTE in response to a high lube oil supply temperature alarm, the temperature continues to rise, your next step should be to __________.

 
 
 
 

22. During an operation of a main propulsion gas turbine, the engine shuts down. Which of the following is the most probable reason for the shutdown?

 
 
 
 

23. Which of the following is the most likely cause for the main propulsion gas turbine engine tripping during start up?

 
 
 
 

24. What is the purpose of the LM2500 GTE enclosure heater?

 
 
 
 

25. A total of how many shock mounts are used to secure the LM2500 enclosure to the ship's foundation?

 
 
 
 

26. Where are the CO2 nozzles located in the LM2500 enclosure?

 
 
 
 

27. 3.10.13.1-4) What type of combustor is used by the LM2500 GTE?

 
 
 
 

28. The gas generator section of the LM2500 GTE is composed of all of the following components EXCEPT which one?

 
 
 
 

29. The struts of the compressor front frame provide passages for all of the following mediums EXCEPT which one?

 
 
 
 

30. (3.10.13.1-7) What is the primary purpose of the diffuser and distributor on the LM2500 GTE?

 
 
 
 

31. Which of the following components prevent(s) objects smaller than 1/4 inch from entering the engine?

 
 
 
 

32. (3.10.13.1-9) How is the HP turbine rotor of the LM2500 GTE cooled?

 
 
 
 

33. How many stages are in the HP turbine of the LM2500 GTE?

 
 
 
 

34. The power turbine (PT) of the LM2500 GTE has a total of how many stages?

 
 
 
 

35. What is the primary function of the main fuel control on the LM2500 GTE?

 
 
 
 

36. In order to get a ready indication for a normal start with an LM2500 marine gas turbine, what permissive must be met?

 
 
 
 

37. Boyle's law can best be defined as _________.

 
 
 
 

38. In the operation of a marine propulsion gas turbine, kinetic and thermal energy required to drive the main propeller shaft are extracted by the _________.

 
 
 
 

39. The term used to describe a gas turbine in which air drawn from the atmosphere passes through the engine only once is which of the following?

 
 
 
 

40. A gas turbine that has a regenerator between the compression and combustion sections in which exhaust gas heat energy is added to the air charge is classified as what type of engine?

 
 
 
 

41. The term used to describe a gas turbine in which the turbine exhaust passes through a cooler and back to the compressor inlet is which of the following?

 
 
 
 

42. In a regenerative or recuperative gas turbine cycle configuration, the heat of the turbine exhaust gas is used to do what?

 
 
 
 

43. For the same amount of available power, how does a low speed two-stroke diesel engine compare to a recuperated gas turbine configuration?

 
 
 
 

44. For shipboard main propulsion application, how does a Intercooled-Recuperated (ICR) cycle gas turbine configuration compare to a Combined Cycle gas turbine configuration?

 
 
 
 

45. Assuming you maintain the same power output, how will a decrease in the compressor inlet air temperature effect a gas turbine engine's efficiency and fuel consumption?

 
 
 
 

46. On a gas turbine engine, a high outside air temperature can cause high turbine inlet temperature, low mass/weight of airflow through the turbine, and which of the following conditions?

 
 
 
 

47. Assuming that the turbine inlet temperature of a gas turbine engine remains constant, which of the following operating parameter changes would be noted with an increase in the compressor inlet air temperature?

 
 
 
 

48. What action should you take if full power vibration limits are exceeded on a GTE?

 
 
 
 

49. What design feature is incorporated into the main propulsion gas turbine to eliminate compressor surge?

 
 
 
 

50. The two main types of "compressor" stalls are known as _________.

 
 
 
 

51. Which of the following is the most probable cause for the sump oil to be excessively aerated on an aero derivative main propulsion gas turbine engine?

 
 
 
 

52. Your first step in response to a Gas Turbine Engine (GTE) high lube oil sump temperature alarm would be __________.

 
 
 
 

53. Lubricating oil contamination in a gas turbine bearing oil sump will most likely come from which of the following?

 
 
 
 

54. The purpose of the air shroud (swirl cup) around the tip of the fuel nozzle of an LM2500 Gas Turbine Engine (GTE) is to __________.

 
 
 
 

55. A fuel analysis report for a gas turbine propelled vessel indicates a calcium level in excess of 0.5 ppm. High calcium levels in distillate fuels for gas turbines can cause which of the following?

 
 
 
 

56. A gas turbine engine is experiencing a high rate of corrosion in the hot section of the engine. Which of the following fuel contamination issues could be associated with this problem?

 
 
 
 

57. During an operation of a gas turbine equipped with an intercooler and recuperator, a low combustion air temperature to the combustor section could be caused by which of the following?

 
 
 
 

58. On a gas turbine powered vessel equipped with a synchro self shifting (SSS) clutch, you are preparing for a power turbine over speed test. What would be an important action to take prior to starting the engine?

 
 
 
 

59. What type of main reduction gear arrangement prevents independent axial and rotational movement of the pinions?

 
 
 
 

60. The purpose of the main reduction gear in a marine gas turbine propulsion installation is to _________.

 
 
 
 

61. The main thrust bearing directly positions which part(s) of the main reduction gear?

 
 
 
 

62. The lubrication principal used by the Kingsbury thrust bearing is the _________.

 
 
 
 

63. 3.10.5.2-2) Gear backlash is best described as which of the following?

 
 
 
 

64. In cases where both the pinion and gear teeth of the main reduction gear have been slightly indented by foreign material, what action should you take?

 
 
 
 

65. When performing a static check to determine tooth contact, you should use which of the following compounds to coat the gear teeth?

 
 
 
 

66. The buildup of contamination in a gas turbine will cause all of the following conditions EXCEPT which one?

 
 
 
 

67. The safety-wiring, or lock wiring, of gas turbine parts is required to _________.

 
 
 
 

68. On a gas turbine powered vessel, what is the last step after an off-line water wash?

 
 
 
 

69. The effectiveness of an off-line wash of a LM2500 GTE can be enhanced by doing which of the following?

 
 
 
 

70. (3.10.7.1-3) On a gas turbine propulsion vessel, you notice a slow but steady increase in gas turbine vibration and specific fuel consumption as the voyage has progressed. What would be a good maintenance technique to use to correct these increases?

 
 
 
 

71. For maintenance, how can you reach the burner units of a can-annular combustor?

 
 
 
 

72. What are the two prime sources of deposits that build up on compressor blades?

 
 
 
 

73. You are preparing for a borescope inspection of a gas turbine engine. Prior to the inspection it is recommended that you do what?

 
 
 
 

74. On a LM2500 gas turbine engine, you are instructed to check the "A" sump three o'clock strut for a potential stress crack. Standing at the compressor air intake, where would this point be located?

 
 
 
 

75. To manually rotate the LM 2500 GT engine, you should use which of the following tools?

 
 
 
 

76. 3.10.8.0-4) It is good engineering practice for you to review the machinery history of an engine before an borescope inspection for all EXCEPT which of the following reasons?

 
 
 
 

77. 3.10.8.0-4) It is good engineering practice for you to review the machinery history of an engine before an borescope inspection for all EXCEPT which of the following reasons?

 
 
 
 

78. You are preparing for a borescope inspection of an LM2500 gas turbine engine. You are reviewing the correct geometric orientation nomenclature which includes which of the following?

 
 
 
 

79. When conducting a borescope inspection, you must be aware of all except which of the following factors?

 
 
 
 

80. On an LM2500 gas turbine powered vessel you are conducting a borescope inspection of the compressor. What is used on each compressor stage as a reference for indexing the blades?

 
 
 
 

81. Zero reference for the LM2500 GTE is established by the use of which of the following engine components?

 
 
 
 

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