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

USCG Gas Turbines (Set 2)

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Question 1 of 30

Active corrosion on copper alloys is indicated by which of the following?

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30 MCQs

#1 Active corrosion on copper alloys is indicated by which of the following? #2 Compressor tip clang can be usually attributed to which of the following operating conditions? #3 Compressor rotor blade tip curl is usually caused by which of the following? #4 Once a compressor is broken in, which of the following factors will most likely cause blade tips to rub? #5 A compressor blade platform that is tilted or raised may indicate which of the following failures? #6 The dimples of a combustor dome band that has a low operating time will usually have what kind of damage? #7 Distortion of the combustor liner assembly is evident when you observe which of the following conditions? #8 Which of the following is the most probable cause if, while underway, the main propulsion gas turbine air intake blow-in doors open? #9 In which of the following ways can compressor surge cause excessive temperatures in the turbine section? #10 On the marine gas turbine engine shown in the illustration, what temperature should be carefully monitored following a shutdown for an engine fire? Illustration GT-0017 #11 On a ship with a marine gas turbine as shown in the illustration, a fire emergency stop is initiated when __________. Illustration GT-0017 #12 If a fire is detected in a main propulsion gas turbine enclosure, which of the following would occur prior to automatic release of the fire extinguishing agent? #13 During an operation of a main propulsion gas turbine, the engine shuts down. Which of the following is the most probable reason for the shutdown? #14 Which of the following is the most likely cause for the main propulsion gas turbine engine tripping during start up? #15 A total of how many shock mounts are used to secure the LM2500 enclosure to the ship's foundation? #16 Which of the following components prevent(s) objects smaller than 1/4 inch from entering the engine? #17 The thermal energy added to the gas as it flows through the combustion section has what effect on the gas? #18 In a gas turbine, the air charge is permitted to be compressed adiabatically by what factor, process, or condition? #19 The Brayton Cycle is a series of events best described by which of the following statements? #20 Why is a gas turbine considered to operate on the Brayton cycle? #21 In a twin-spool turbine, secondary air is most essential for cooling in what section? #22 Which of the following statements is true regarding centrifugal compressors? #23 A centrifugal compressor assembly consists of which of the following? #24 While air is being compressed in a centrifugal flow gas turbine, what happens to the direction of air flow? #25 What is the disadvantage of a dual-entry centrifugal compressor compared to a single-entry centrifugal compressor? #26 When working in or around intake areas, which of the following precautions should be taken? #27 On the GE LM2500 gas turbine engine, magnetic pickups are utilized for what purpose? #28 In a gas turbine propulsion installation, the typical control system is designed to perform which of the following three functions? #29 Thermal energy is the only form of energy that can be added to or removed from a substance. How is thermal energy that is added to a substance stored? #30 Rankine is the temperature scale that corresponds to which of the following?

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