Pass Benchmark: 70% (21/30) • Standard: USCG NMC / 46 CFR
USCG Gas Turbines (Set 8)
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Question 1 of 30
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 relative humidity?
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30 MCQs #1 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 relative humidity? #2 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 #3 The lube oil scavenge pressure on the marine gas turbine shown in the illustration is sensed by which of the following? Illustration GT-0017 #4 Which of the following are the principle factors that affect the performance of a gas turbine compressor? #5 Compressor characteristics are normally summarized in the form of which of the following? #6 On a vessel equipped with propulsion gas turbines, the operators initial response to a high vibration alarm should be which of the following? #7 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-0023 #8 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 which of the following? Illustration GT-0024 #9 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 #10 The lube oil system shown in the illustration, consists of which of the following sub-systems? Illustration GT-0024 #11 Which of the following conditions permits a gas turbine to produce 100% power? #12 How do you gain access to the burner units of a can-annular combustor to perform maintenance? #13 Boyle's law can best be defined as which of the following? #14 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 the following? #15 The effectiveness of an off-line wash wash of a LM2500 gas turbine engine can be enhanced by doing which of the following? #16 Zero reference for the GE LM2500 gas turbine engine is established by the use of which of the following engine components? #17 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 reference for indexing the blades? #18 What type of gas turbine cycle configuration is shown in the illustration? Illustration GT-0031 #19 What type of metallurgical failure does Item B represent in the illustration? Illustration GT-0014 #20 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 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? #21 When tip clang takes place on a gas turbine engine, the major damage occurs to what area of the blade? #22 What type of metallurgical failure does Item A represent in the illustration? Illustration GT-0014 #23 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 combustor dome where burn through has removed the metal. What would be your course of action? #24 What does the term "lockout" of a Synchro-Self-Shifting (SSS) clutch system mean? Illustration GT-0018 #25 How is the clutch shown in the attached illustration engaged? Illustration GT-0018 #26 What is the primary purpose of the diffuser and distributor on the GE LM2500 gas turbine engine? #27 What is the purpose of the GE LM2500 gas turbine enclosure heater? #28 What type of combustor is used by the GE LM2500 gas turbine engine? #29 Where are the CO2 nozzles located in the GE LM2500 gas turbine enclosure? #30 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?
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