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Engine · 145 questions

Retired questions · Gas Turbines - USCG Exam Questions

These are retired questions the Coast Guard no longer draws exams from. They stay online for reference; the current questions are in Gas Turbines.

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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All Retired questions · Gas Turbines questions

Questions 101–145 of 145 · page 2 of 2

  1. #150 How many fuel igniters would be installed on the marine gas turbine engine shown in the illustration? See illustration GT-0017 illustration
  2. #151 The fuel oil back pressure regulator on the fuel system shown in the illustration, returns fuel to the __________. Illustration GT-0021 illustration
  3. #153 The purpose of the air shroud (swirl cup) around the tip of the fuel nozzle of an LM2500 GTE is to __________.
  4. #157 What does the term "lockout" of a Synchro-Self-Shifting (SSS) clutch system mean? See illustration GT-0018 illustration
  5. #158 As shown in the illustration, the Synchro-Self-Shifting (SSS) clutch used on the marine gas turbine gears, requires which of the following inputs or c... illustration
  6. #159 How is the clutch shown in the attached illustration engaged? See illustration GT-0032 illustration
  7. #162 The purpose of the main reduction gear in a marine gas turbine propulsion installation is to _________.
  8. #164 The lubrication principal used by the Kingsbury thrust bearing is the _________.
  9. #168 The buildup of contamination in a gas turbine will cause all of the following conditions EXCEPT which one?
  10. #169 The safety-wiring, or lock wiring, of gas turbine parts is required to _________.
  11. #171 The effectiveness of an off-line wash wash of a LM2500 GTE can be enhanced by doing which of the following?
  12. #173 For maintenance, how can you reach the burner units of a can-annular combustor?
  13. #175 You are preparing for a borescope inspection of a gas turbine engine. Prior to the inspection it is recommended that you do what?
  14. #177 To manually rotate the LM 2500 GT engine, you should use which of the following tools?
  15. #178 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 follow...
  16. #180 When conducting a borescope inspection, you must be aware of all except which of the following factors?
  17. #182 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 refere...
  18. #183 Zero reference for the LM2500 GTE is established by the use of which of the following engine components?
  19. #190 Cadmium and zinc coatings provide which of the following types of protection for the base metal?
  20. #194 What type of metallurgical failure does Item 1 represent in the illustration? see Illustration GT-0038 illustration
  21. #195 What type of metallurgical failure does Item 2 represent in the illustration? see Illustration GT-0038 illustration
  22. #196 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...
  23. #198 When tip clang takes place on a GTE, the major damage occurs to what area of the blade?
  24. #199 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...
  25. #203 While underway on a ship with gas turbine engines, the most likely indication of an engine stall is _________.
  26. #208 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...
  27. #211 On the marine gas turbine shown in the illustration, the gas generator speed sensor is located _________. Illustration GT-0017 illustration
  28. #212 On marine gas turbine engine panel shown in the illustration, which of the following conditions would prevent the auto start sequence from successfull... illustration
  29. #213 What is the purpose of the LM2500 GTE enclosure heater?
  30. #215 Where are the CO2 nozzles located in the LM2500 enclosure?
  31. #216 What type of combustor is used by the LM2500 GTE?
  32. #217 The gas generator section of the LM2500 GTE is composed of all of the following components EXCEPT which one?
  33. #218 The struts of the compressor front frame provide passages for all of the following mediums EXCEPT which one?
  34. #219 What is the primary purpose of the diffuser and distributor on the LM2500 GTE?
  35. #221 How is the HP turbine rotor of the LM2500 GTE cooled?
  36. #222 How many stages are in the HP turbine of the LM2500 GTE?
  37. #223 The power turbine (PT) of the LM2500 GTE has a total of how many stages?
  38. #224 What is the primary function of the main fuel control on the LM2500 GTE?
  39. #225 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
  40. #226 Marine gas turbine fuel oil systems, as shown in the illustration, require fuel oil shutdown valves to be _________. Illustration GT-0021 illustration
  41. #227 In order to get a ready indication for a normal start with an LM2500 marine gas turbine, what permissive must be met?
  42. #228 In the marine gas turbine engine shown in the illustration, the 9th stage bleed air is used for __________. Illustration GT-0017 illustration
  43. #229 In the marine gas turbine engine shown in the illustration, the 13th stage bleed air is used for __________. Illustration GT-0017 illustration
  44. #230 In the marine gas turbine engine shown in the illustration, the HP turbine 2nd stage nozzle vanes are cooled by __________. Illustration GT-0020 illustration
  45. #231 As shown in the illustration, the HP turbine 2nd stage blades are cooled by convection, with the cooling air being discharged at the _________. Illust... illustration

Gas Turbines questions: what to expect

Q How many Gas Turbines questions are in the Engine pool?

This retired set holds 145 Gas Turbines questions the Coast Guard no longer draws on exams. They stay online for reference; the current Gas Turbines module is the one to study.

Q What score do I need to pass the Gas Turbines module?

Most USCG exam modules, including Gas Turbines, require 70 percent to pass. Rules of the Road modules require 90 percent.

Q Are these the real USCG Gas Turbines exam questions?

Yes. They are the published U.S. Coast Guard questions, matched to the National Maritime Center's 2026 sample examinations. Answer any question to see the correct choice, the USCG reference and the illustration where the question uses one.

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About the Engine question pool

The Engine pool holds the current U.S. Coast Guard questions for engineering credentials, from QMED ratings through DDE and Assistant Engineer up to Chief. Answer any question to see the correct choice instantly.