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

USCG Gas Turbines (Set 6)

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Question 1 of 30

Which of the following statements is true about an axial compressor disk-type rotor?

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30 MCQs

#1 Which of the following statements is true about an axial compressor disk-type rotor? #2 The primary function of an axial compressor rotor blade is which of the following? #3 Why are loose-fitting blades used on the first several stages of large axial compressors? #4 What is a compressor midspan shrould? #5 What are the two common forms of axial compressor rotor blade roots? #6 The lube oil system shown in the illustration, is designed to lubricate the main bearings by what principle? Illustration GT-0023 #7 What is the purpose of the air/oil separator shown in the illustration of the gas turbine lube oil system? Illustration GT-0024 #8 The turbine nozzles function to direct the gases in what direction? #9 What are the two principle functions of the turbine nozzle guide vanes? #10 The circle of turbine stationary vanes that convert pressure and thermal energy to velocity energy and direct the combustion gases in the direction of turbine wheel rotation is referred to as what? #11 What method is utilized to allow turbine nozzle blades to withstand high inlet temperatures? #12 The turbine nozzle blades convert the combustion gases heat and pressure energy into what form of energy? #13 On most marine gas turbines used aboard ships, vibration sensors are identified as which of the following? #14 Routine water washing of the gas turbine engine compressor shown in the illustration, is usually performed while operating under which of the following conditions? Illustration GT-0017 #15 The two primary sources of deposits that build up on compressor blades are? #16 When auto starting a gas turbine engine similar to the one shown in the illustration, a "False Start" indication will initiate if which of the following conditions occurs? Illustration GT-0016 #17 During an auto-start sequence on the marine gas turbine control console shown in the illustration, what would be the correct order of events required to occur after the start sequence begins? Illustration GT-0016 #18 Aboard ship, single-shaft gas turbines are used mostly as prime movers for which of the following applications? #19 Which of the following is an advantage of a single-shaft gas turbine engine compared to a split-shaft gas turbine engine? #20 In a single shaft, cold-end drive gas turbine, the power output speed has what relationship to the speed of the compressor? #21 Which of the following is the main advantage of a split axial compressor case? #22 A pressure stage of an axial-type compressor consists of which of the following? #23 Each stage of an axial-compressor of a gas turbine can compress the atmospheric air a total of how many times? #24 The purpose of the metal spray rub coating on the rotor and stator casing of an axial type compressor is which of the following? #25 An axial compressor basically consists of which of the following? #26 An axial compressor stage is represented by which of the following components and in which order? #27 Which of the following components removes the oil from the transfer gearbox? #28 The short length of the can-annular combustion chamber provides for which of the following conditions? #29 Ball or roller antifriction bearings are used to support gas turbine rotors for all EXCEPT which of the following? #30 Under standard atmospheric conditions, 208.7 PSIG converts to approximately what in absolute pressure?

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