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

USCG Engine Gas Turbines (Supplementary) (Set 6)

30:00

|

Question 1 of 26

Question Navigator

Correct Incorrect Pending Starred

Question 1 of 26

What type of metallurgical failure does Item 1 represent in the illustration? see Illustration GT-0038 Illustration GT-0038: the U.S. Coast Guard has not released this illustration.

Browse Questions in Set 6

26 MCQs

#1 What type of metallurgical failure does Item 1 represent in the illustration? see Illustration GT-0038 Illustration GT-0038: the U.S. Coast Guard has not released this illustration. #2 What type of metallurgical failure does Item 2 represent in the illustration? see Illustration GT-0038 Illustration GT-0038: the U.S. Coast Guard has not released this illustration. #3 You are conducting a borescope inspection of the compressor section of a 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? #4 When tip clang takes place on a GTE, the major damage occurs to what area of the blade? #5 You are conducting a borescope inspection of the combustor section of a 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? #6 While underway on a ship with gas turbine engines, the most likely indication of an engine stall is _________. #7 If after reducing power to a GTE in response to a high lube oil supply temperature alarm, the temperature continues to rise, your next step should be to __________. #8 On the marine gas turbine shown in the illustration, the gas generator speed sensor is located _________. Illustration GT-0017 #9 On 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 #10 What is the purpose of the LM2500 GTE enclosure heater? #11 Where are the CO2 nozzles located in the LM2500 enclosure? #12 What type of combustor is used by the LM2500 GTE? #13 The gas generator section of the LM2500 GTE is composed of all of the following components EXCEPT which one? #14 The struts of the compressor front frame provide passages for all of the following mediums EXCEPT which one? #15 What is the primary purpose of the diffuser and distributor on the LM2500 GTE? #16 How is the HP turbine rotor of the LM2500 GTE cooled? #17 How many stages are in the HP turbine of the LM2500 GTE? #18 The power turbine (PT) of the LM2500 GTE has a total of how many stages? #19 What is the primary function of the main fuel control on the LM2500 GTE? #20 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 #21 Marine gas turbine fuel oil systems, as shown in the illustration, require fuel oil shutdown valves to be _________. Illustration GT-0021 #22 In order to get a ready indication for a normal start with an LM2500 marine gas turbine, what permissive must be met? #23 In the marine gas turbine engine shown in the illustration, the 9th stage bleed air is used for __________. Illustration GT-0017 #24 In the marine gas turbine engine shown in the illustration, the 13th stage bleed air is used for __________. Illustration GT-0017 #25 In the marine gas turbine engine shown in the illustration, the HP turbine 2nd stage nozzle vanes are cooled by __________. Illustration GT-0020 #26 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

Question Discussion & Notes

0

Have a doubt, memory trick, or exam update? Share your insights with fellow mariners.

Loading mariner discussions...