Pass Benchmark: 70% • Standard: USCG NMC / 46 CFR

USCG Engine Gas Turbines (Supplementary) (Set 5)

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Question 1 of 30

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

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30 MCQs

#1 What action should you take if full power vibration limits are exceeded on a GTE? #2 The two main types of "compressor" stalls are known as _________. #3 To prevent overheating of the illustrated turbine blade, which of the following fluids is circulated through it via the shaped internal passages? See Illustration GT-0035 Illustration GT-0035: the U.S. Coast Guard has not released this illustration. #4 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 #5 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? #6 Your first step in response to a GTE high lube oil sump temperature alarm would be __________. #7 The secondary passages on the gas turbine engine fuel nozzles shown in the illustration are designed to open at approximately what pressure? See illustration GT-0005 #8 How many fuel igniters would be installed on the marine gas turbine engine shown in the illustration? See illustration GT-0017 #9 The fuel oil back pressure regulator on the fuel system shown in the illustration, returns fuel to the __________. Illustration GT-0021 #10 The purpose of the air shroud (swirl cup) around the tip of the fuel nozzle of an LM2500 GTE is to __________. #11 What does the term "lockout" of a Synchro-Self-Shifting (SSS) clutch system mean? See illustration GT-0018 #12 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 conditions to make engagement possible? See illustration GT-0018 #13 How is the clutch shown in the attached illustration engaged? See illustration GT-0032 Illustration GT-0032: the U.S. Coast Guard has not released this illustration. #14 The purpose of the main reduction gear in a marine gas turbine propulsion installation is to _________. #15 The lubrication principal used by the Kingsbury thrust bearing is the _________. #16 When performing a static check to determine tooth contact, you should use which of the following compounds to coat the gear teeth? #17 The buildup of contamination in a gas turbine will cause all of the following conditions EXCEPT which one? #18 The safety-wiring, or lock wiring, of gas turbine parts is required to _________. #19 The effectiveness of an off-line wash wash of a LM2500 GTE can be enhanced by doing which of the following? #20 For maintenance, how can you reach the burner units of a can-annular combustor? #21 What are the two prime sources of deposits that build up on compressor blades? #22 You are preparing for a borescope inspection of a gas turbine engine. Prior to the inspection it is recommended that you do what? #23 To manually rotate the LM 2500 GT engine, you should use which of the following tools? #24 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? #25 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? #26 When conducting a borescope inspection, you must be aware of all except which of the following factors? #27 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 which of the following components? Illustration GT-0006 #28 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? #29 Zero reference for the LM2500 GTE is established by the use of which of the following engine components? #30 Cadmium and zinc coatings provide which of the following types of protection for the base metal?

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