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

USCG Engine Gas Turbines (Supplementary) (Set 1)

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Question 1 of 30

Compared to other types of engines, what is the biggest advantage of a GTE?

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30 MCQs

#1 Compared to other types of engines, what is the biggest advantage of a GTE? #2 The term "divergent" is best described as _________. #3 Which of the following terms refers to stator blades? #4 What are the two common forms of blade roots? #5 In the operation of a marine propulsion gas turbine, kinetic and thermal energy required to drive the main propeller shaft are extracted by the _________. #6 Which of the following factors permits a gas turbine to produce 100% power? #7 How do the high-velocity high-temperature gases cause the rotor of a gas turbine to rotate? #8 An "open cycle" of a gas turbine is best described by which of the following statements? #9 The Brayton Cycle is a series of events best described by which of the following statements? #10 A gas turbine in which exhaust gas heat energy is added to the air charge between the compressor and combustion chamber is classified as a/an? #11 The purpose of the metal spray rub coating on the rotor and stator casing of a marine type gas turbine is to _________. #12 The basic components of a gas turbine gas generator include which of the following? #13 What is the function of the stator in a gas turbine compressor? #14 A pressure stage of a gas turbine compressor consists of which of the following? #15 Before combustion can occur, the combustion air must be delivered to the combustor at a high-pressure and low-velocity. High-velocity, low-pressure air is converted to high-pressure, low- velocity air at what part of the compressor? #16 Why are loose-fitting blades used on the first several stages of large compressors? #17 What is the disadvantage of a dual-entry centrifugal compressor compared to a single- entry centrifugal compressor? #18 Each stage of an axial-compressor of a gas turbine can compress the atmospheric air a total of how many times? #19 What is a midspan platform? #20 Which of the following designs is the most satisfactory method for attaching turbine blades? #21 Turbine disks are commonly attached to the shaft by which of the following methods? #22 What are the two common methods of power turbine blade retention? #23 The turbine nozzle blades convert the combustion gases heat and pressure energy into what form of energy? #24 The turbine nozzles function to direct the gases in what direction? #25 What method is utilized to allow nozzle blades to withstand high inlet temperatures? #26 A centrifugal-flow gas turbine uses what type of combustion chamber? #27 The short length of the can-annular combustion chamber provides for which of the following conditions? #28 In the marine gas turbine engine shown in the illustration, the purpose of the COWL and diffuser assembly installed in the combustor is to provide __________. Illustration GT-0009 #29 Aboard ship, single-shaft gas turbines are used mostly as prime movers for which of the following applications? #30 Which type of GTE can handle a larger volume of air?

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