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Engine · 335 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 301–335 of 335 · page 4 of 4

  1. #571 Rotation of the controllable-pitch propeller (CPP) blades is achieved through axial movement of what component in the hub body assembly?
  2. #572 The lubrication principle utilized by the Kingsbury thrust bearing is which of the following?
  3. #573 What are the two primary sources of deposits that build up on compressor blades?
  4. #574 What is the primary purpose of the diffuser and distributor on the GE LM2500 gas turbine?
  5. #575 Which of the following components prevent objects smaller than 1/4 inch from entering the GE LM2500 gas turbine?
  6. #576 As shown in the illustration, the component labeled "G" would be identified as a ______. illustration
  7. #577 For shipboard main propulsion application, how does an intercooled-recuperated (ICR) cycle gas turbine configuration compare to a combined cycle gas t...
  8. #578 Which of the following statements about the intercooled-recuperated gas turbine cycle is true? illustration
  9. #579 The fuel oil service system normally delivers fuel to a marine propulsion gas turbine engine at a nominal pressure of __________.
  10. #580 The fuel purge valve on the marine gas turbine shown in the illustration, is opened _________. illustration
  11. #581 What does the term "lock-out" of a synchro-self-shifting (SSS) clutch system mean? illustration
  12. #582 Provisions for avoiding the buildup of ice on the intake air surfaces of a gas turbine plant can be found where?
  13. #583 Which of the following terms refers to axial compressor stator blades?
  14. #584 Which of the following statements is true concerning axial compressor disk-type rotors?
  15. #585 The purpose of the separating nozzle in the accumulator of a water-tube, coil-type, steam generator is to separate __________.
  16. #586 Auxiliary boilers are divided into several classifications, one of which is __________.
  17. #587 In the boiler steam and water system, pressure is highest in the __________.
  18. #588 Which of the following is a disadvantage of utilizing a gas turbine versus a diesel engine for propulsion?
  19. #589 A compressor is operating at an inlet pressure of 14.7 (atmospheric pressure at the time of measurement) and a compressor discharge pressure of 123 ps...
  20. #590 What is the function of the stator in an axial gas turbine compressor?
  21. #591 What is the approximate percentage of air extracted from the compressor that is mixed with fuel for combustion in a gas turbine?
  22. #592 How do you manually lock out an SSS clutch?
  23. #593 You are on watch on a gas turbine propelled vessel as shown in the illustration. After reducing power in response to a high lube oil supply temperatur... illustration
  24. #594 Compressor surge is caused by which of the following factors?
  25. #595 The thermal energy added to the gas as it flows through the combustion section has what effect on the gas?
  26. #596 Variable stator vanes give an axial gas turbine compressor which of the following capabilities?
  27. #597 What are the two principal functions of the turbine nozzle guide vanes?
  28. #598 The lube oil system shown in the illustration consists of all the following sub-systems EXCEPT? illustration
  29. #599 The bleed air surge relief valve differs from a normal relief valve in which of the following ways?
  30. #600 What is the purpose of the Controllable-Pitch Propeller (CPP) hydraulic oil power system?
  31. #601 Which of the following are the principal factors that affect the performance of a gas turbine compressor?
  32. #602 On a vessel equipped with marine propulsion gas turbines, the operator's initial response to a high vibration alarm should be which of the following?
  33. #603 Routine water washing of the gas turbine compressor shown in the illustration, is usually performed while operating under which of the following condi... illustration
  34. #604 Marine GTE fuel oil systems, as shown in the illustration, require fuel oil shutdown valves to be _________. illustration
  35. #605 You are preparing for a borescope inspection of an LM2500 gas turbine engine. You are reviewing the correct geometric orientation nomenclature which i...

Gas Turbines questions: what to expect

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

There are 335 Gas Turbines questions on this site, every one released by the U.S. Coast Guard or taken from the National Maritime Center's sample examinations, with its correct answer. The exam draws its Gas Turbines module from the same pool.

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.