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Engine · 277 questions

Gas Turbines - USCG Exam Questions

Gas turbine theory, construction, operation, and the support systems found in gas turbine propulsion plants.

Every question below is a real U.S. Coast Guard exam question with four choices. Answer one and the correct choice is revealed instantly, with the USCG reference and illustration where the question uses one.

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Questions 201–277 of 277 · page 3 of 3

  1. #471 In order to get a ready indication for a normal start with an GE LM2500 gas turbine engine, what permissive(s) must be met?
  2. #472 For the GE LM2500 gas turbine engine shown in the illustration, the HP turbine 2nd stage nozzle vanes are cooled by which of the following? Illustrati... illustration
  3. #473 For the GE LM2500 gas turbine engine shown in the illustration, the HP turbine 2nd stage blades are cooled by convection, with the cooling air being d... illustration
  4. #474 In the ignition system of a gas turbine engine, how is optimum spark achieved?
  5. #475 What is the power source for the ignition exciter of a gas turbine engine?
  6. #476 What is the most common type of spark igniter used on a gas turbine engine?
  7. #477 When removing the gas turbine engine as shown in the illustration, how is the engine removal accomplished? Illustration GT-0022 illustration
  8. #478 A gas turbine engine’s main lube oil system pump check valve serves to maintain system prime and perform what other function?
  9. #479 How is the lube oil supplied to each bearing in a gas turbine engine controlled?
  10. #480 The electrostatic vent fog precipitator removes oil mist from which of the following areas?
  11. #481 When the main reduction gear lube oil system is secured, which of the following components maintains the air within the casing at less than 35 percent...
  12. #482 For the gas turbine engine lube oil system shown in the illustration, what is the purpose of the lube oil supply check valves? Illustration GT-0024 illustration
  13. #483 The lube oil scavenge pressure on the marine gas turbine shown in the illustration is sensed by which of the following? Illustration GT-0017 illustration
  14. #484 Which of the following are the principle factors that affect the performance of a gas turbine compressor?
  15. #485 Compressor characteristics are normally summarized in the form of which of the following?
  16. #486 On a vessel equipped with propulsion gas turbines, the operators initial response to a high vibration alarm should be which of the following?
  17. #487 As shown in the illustration, what is the purpose of pressurizing the main bearing lube oil sumps on a typical marine gas turbine? Illustration GT-002... illustration
  18. #488 On the gas turbine engine lube oil system shown in the illustration, air and oil are primarily separated in the air/oil separator through the use of w... illustration
  19. #489 On the marine gas turbine engine shown in the illustration, the 8th stage bleed air is used for which of the following? Illustration GT-0017 illustration
  20. #490 The lube oil system shown in the illustration, consists of which of the following sub-systems? Illustration GT-0024 illustration
  21. #491 Which of the following conditions permits a gas turbine to produce 100% power?
  22. #492 How do you gain access to the burner units of a can-annular combustor to perform maintenance?
  23. #493 Boyle's law can best be defined as which of the following?
  24. #494 In the operation of a marine propulsion gas turbine, kinetic and thermal energy required to drive the main propeller shaft are extracted by which of t...
  25. #495 The effectiveness of an off-line wash wash of a LM2500 gas turbine engine can be enhanced by doing which of the following?
  26. #496 Zero reference for the GE LM2500 gas turbine engine is established by the use of which of the following engine components?
  27. #497 On an GE LM2500 gas turbine powered vessel you are conducting a borescope inspection of the compressor. What is used on each compressor stage as a ref...
  28. #498 What type of gas turbine cycle configuration is shown in the illustration? Illustration GT-0031 illustration
  29. #499 What type of metallurgical failure does Item B represent in the illustration? Illustration GT-0014 illustration
  30. #500 You are conducting a borescope inspection of the compressor section of a GE LM2500 gas turbine. In stage four, you see a slight tilt to one blade and...
  31. #501 When tip clang takes place on a gas turbine engine, the major damage occurs to what area of the blade?
  32. #502 What type of metallurgical failure does Item A represent in the illustration? Illustration GT-0014 illustration
  33. #503 You are conducting a borescope inspection of the combustor section of a GE LM2500 gas turbine engine. You observe a one square inch hole in the combus...
  34. #504 What does the term "lockout" of a Synchro-Self-Shifting (SSS) clutch system mean? Illustration GT-0018 illustration
  35. #505 How is the clutch shown in the attached illustration engaged? Illustration GT-0018 illustration
  36. #506 What is the primary purpose of the diffuser and distributor on the GE LM2500 gas turbine engine?
  37. #507 What is the purpose of the GE LM2500 gas turbine enclosure heater?
  38. #508 What type of combustor is used by the GE LM2500 gas turbine engine?
  39. #509 Where are the CO2 nozzles located in the GE LM2500 gas turbine enclosure?
  40. #510 The gas generator section of the GE LM2500 gas turbine engine is composed of all of the following components EXCEPT for which of the following?
  41. #511 How many stages are in the HP turbine of the GE LM2500 gas turbine engine?
  42. #512 The struts of the compressor front frame provide passages for all of the following mediums EXCEPT for which of the following?
  43. #513 The power turbine (PT) of the GE LM2500 gas turbine engine has a total of how many stages?
  44. #514 How is the HP turbine rotor of the GE LM2500 gas turbine engine cooled?
  45. #515 If after reducing power to a gas turbine engine in response to a high lube oil supply temperature alarm, the temperature continues to rise, your next...
  46. #516 What type of main lube oil supply and scavenging pump is installed on the marine gas turbine engine shown in the illustration? Illustration GT-0017 illustration
  47. #517 What action should you take if full power vibration limits are exceeded on a gas turbine engine?
  48. #518 The build-up of contamination in a gas turbine will cause all of the following conditions EXCEPT which of the following?
  49. #519 Why is safety-wiring, or lock wiring of gas turbine parts required?
  50. #520 You are preparing for a borescope inspection of a gas turbine engine. Prior to the inspection it is recommended that you do which of the following?
  51. #521 To manually rotate the GE LM2500 gas turbine engine, you should use which of the following tools?
  52. #522 The lubrication principal used by the Kingsbury thrust bearing is which of the following?
  53. #523 The purpose of the main reduction gear in a marine gas turbine propulsion installation is which of the following?
  54. #524 On the marine gas turbine shown in the illustration, the gas generator speed sensor is located where? Illustration GT-0017 illustration
  55. #525 Cadmium and zinc coatings provide which of the following type of protection for the base metal?
  56. #526 When dissimilar metals come in contact with a conductor, which of the following types of metal deterioration takes place?
  57. #527 The two main types of "compressor" stalls are known as which of the following?
  58. #528 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?
  59. #529 On the marine gas turbine engine panel shown in the illustration, which of the following conditions would prevent the auto-start sequence from success... illustration
  60. #530 The purpose of the air shroud (swirl cup) around the tip of the fuel nozzle of an GE LM2500 gas turbine engine is which of the following?
  61. #531 How many fuel igniters would be installed on the marine gas turbine engine shown in the illustration? Illustration GT-0017 illustration
  62. #532 The fuel oil back pressure regulator on the fuel system shown in the illustration, returns fuel to the which of the following? Illustration GT-0021 illustration
  63. #533 The secondary passages on the gas turbine engine fuel nozzles shown in the illustration are designed to open at approximately what pressure? Illustrat... illustration
  64. #534 What is the primary function of the main fuel control on the GE LM2500 gas turbine engine?
  65. #535 As shown in the illustration of a gas turbine fuel oil system, when the engine fuel oil valves are de-energized, the remaining fuel left in the system... illustration
  66. #536 You are preparing for a borescope inspection of a GE LM2500 gas turbine engine. You are reviewing the correct geometric orientation nomenclature which...
  67. #537 When conducting a borescope inspection, you must be aware of all of the following factors EXCEPT which?
  68. #538 The six borescope ports located in the compressor rear frame casing of the marine propulsion gas turbine shown, can be used to inspect all EXCEPT whic... illustration
  69. #539 While underway on a ship with gas turbine engines, the most likely indication of an engine stall is which of the following?
  70. #540 To prevent overheating of the illustrated turbine blade, which of the following fluids is circulated through it via the shaped internal passages? Illu... illustration
  71. #541 As shown in the illustration, the HP turbine 2nd stage blades are cooled by convection, with the cooling air being discharged at which of the followin... illustration
  72. #542 In the marine gas turbine engine shown in the illustration, the 9th stage bleed air is used for which of the following? Illustration GT-0017 illustration
  73. #543 In the marine gas turbine engine shown in the illustration, the 13th stage bleed air is used for which of the following? Illustration GT-0017 illustration
  74. #544 In the marine gas turbine engine shown in the illustration, the HP turbine 2nd stage nozzle vanes are cooled by which of the following? Illustration G... illustration
  75. #545 In order to get a ready indication for a normal start with a GE LM2500 marine gas turbine, what permissive(s) must be met?
  76. #546 Your first step in response to a gas turbine engine high lube oil sump temperature alarm would be which of the following?
  77. #547 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?

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