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

USCG Engine Gas Turbines (Supplementary) (Set 4)

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Question 1 of 30

When removing the marine gas turbine engine as shown in the illustration, how is the engine removal accomplished? Illustration GT-0022

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30 MCQs

#1 When removing the marine gas turbine engine as shown in the illustration, how is the engine removal accomplished? Illustration GT-0022 #2 On a propulsion marine gas turbine, if full power temperatures become excessive, what action should the operator take? #3 While standing watch on a ship in the engine room with marine gas turbine engines as shown in the illustration, if after reducing power in response to a high lube oil supply temperature alarm, the temperature continues to increase, your next step should be to __________. Illustration GT-0017 #4 On a vessel equipped with marine propulsion gas turbines, the operators initial response to a high vibration alarm should be to _________. #5 While standing watch underway on a ship with marine gas turbines shown in the illustration, a fire emergency stop is initiated when __________. Illustration GT-0017 #6 The two main types of "compressor" stalls are known as _________. #7 What is the purpose of the LM2500 GTE enclosure heater? #8 A total of how many shock mounts are used to secure the LM2500 enclosure to the ship's foundation? #9 Where are the CO2 nozzles located in the LM2500 enclosure? #10 What type of combustor is used by the LM2500 GTE? #11 The gas generator section of the LM2500 GTE is composed of all of the following components EXCEPT which one? #12 The struts of the compressor front frame provide passages for all of the following mediums EXCEPT which one? #13 What is the primary purpose of the diffuser and distributor on the LM2500 GTE? #14 Which of the following components prevent(s) objects smaller than 1/4 inch from entering the engine? #15 How is the HP turbine rotor of the LM2500 GTE cooled? #16 How many stages are in the HP turbine of the LM2500 GTE? #17 The power turbine (PT) of the LM2500 GTE has a total of how many stages? #18 What is the primary function of the main fuel control on the LM2500 GTE? #19 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 the _________. Illustration GT-0021 #20 In order to get a ready indication for a normal start with an LM2500 marine gas turbine, what permissive must be met? #21 In the marine gas turbine engine shown in the illustration, the 9th stage bleed air is used for __________. Illustration GT-0017 #22 In the marine gas turbine engine shown in the illustration, the 13th stage bleed air is used for __________. Illustration GT-0017 #23 In the marine gas turbine engine shown in the illustration, the HP turbine 2nd stage nozzle vanes are cooled by __________. Illustration GT-0020 #24 As shown in the illustration, the HP turbine 2nd stage blades are cooled by convection, with the cooling air being discharged at the _________. Illustration GT-0011 #25 Boyle's law can best be defined as _________. #26 In the operation of a marine propulsion gas turbine, kinetic and thermal energy required to drive the main propeller shaft are extracted by the _________. #27 What type of gas turbine cycle configuration is shown in the illustration? See illustration GT-0031 #28 Based on the data shown in the illustration, which statement of the following is correct? Illustration GT-0030 Illustration GT-0030: the U.S. Coast Guard has not released this illustration. #29 Which of the following statements about the intercooled-recuperated gas turbine cycle is true? Refer to Illustration GT-0031 #30 For shipboard main propulsion application, how does a Intercooled-Recuperated (ICR) cycle gas turbine configuration compare to a Combined Cycle gas turbine configuration?

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