Pass Benchmark: 70% (21/30) • Standard: USCG NMC / 46 CFR

USCG Gas Turbines (Set 9)

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Question 1 of 30

How many stages are in the HP turbine of the GE LM2500 gas turbine engine?

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#1 How many stages are in the HP turbine of the GE LM2500 gas turbine engine? #2 The struts of the compressor front frame provide passages for all of the following mediums EXCEPT for which of the following? #3 The power turbine (PT) of the GE LM2500 gas turbine engine has a total of how many stages? #4 How is the HP turbine rotor of the GE LM2500 gas turbine engine cooled? #5 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 step should be which of the following? #6 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 #7 What action should you take if full power vibration limits are exceeded on a gas turbine engine? #8 The build-up of contamination in a gas turbine will cause all of the following conditions EXCEPT which of the following? #9 Why is safety-wiring, or lock wiring of gas turbine parts required? #10 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? #11 To manually rotate the GE LM2500 gas turbine engine, you should use which of the following tools? #12 The lubrication principal used by the Kingsbury thrust bearing is which of the following? #13 The purpose of the main reduction gear in a marine gas turbine propulsion installation is which of the following? #14 On the marine gas turbine shown in the illustration, the gas generator speed sensor is located where? Illustration GT-0017 #15 Cadmium and zinc coatings provide which of the following type of protection for the base metal? #16 When dissimilar metals come in contact with a conductor, which of the following types of metal deterioration takes place? #17 The two main types of "compressor" stalls are known as which of the following? #18 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? #19 On the marine gas turbine engine panel shown in the illustration, which of the following conditions would prevent the auto-start sequence from successfully completing? Illustration GT-0016 #20 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? #21 How many fuel igniters would be installed on the marine gas turbine engine shown in the illustration? Illustration GT-0017 #22 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 #23 The secondary passages on the gas turbine engine fuel nozzles shown in the illustration are designed to open at approximately what pressure? Illustration GT-0005 #24 What is the primary function of the main fuel control on the GE LM2500 gas turbine engine? #25 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 is recirculated back to which of the following? Illustration GT-0021 #26 You are preparing for a borescope inspection of a GE LM2500 gas turbine engine. You are reviewing the correct geometric orientation nomenclature which includes which of the following? #27 When conducting a borescope inspection, you must be aware of all of the following factors EXCEPT which? #28 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 #29 While underway on a ship with gas turbine engines, the most likely indication of an engine stall is which of the following? #30 To prevent overheating of the illustrated turbine blade, which of the following fluids is circulated through it via the shaped internal passages? Illustration GT-0029

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