Pass Benchmark: 70% (21/30) • Standard: USCG NMC / 46 CFR
USCG Gas Turbines (Set 1)
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Question 1 of 30
When working with gas turbine synthetic lube oil, which of the following safety measures should always be observed?
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30 MCQs #1 When working with gas turbine synthetic lube oil, which of the following safety measures should always be observed? #2 On the gas turbine shown in the illustration, which of the following best describes the main principle of operation of the component contained within the area labeled "C"? Illustration GT-0001 #3 The term used to describe a gas turbine in which air drawn from the atmosphere passes through the engine only once is which of the following? #4 A gas turbine that has a regenerator between the compression and combustion sections in which exhaust gas heat energy is added to the air charge is classified as what type of engine? #5 The term used to describe a gas turbine in which the turbine exhaust passes through a cooler and back to the compressor inlet is which of the following? #6 In a regenerative or recuperative gas turbine cycle configuration, the heat of the turbine exhaust gas is used to do what? #7 For the same amount of available power, how does a low speed two-stroke diesel engine compare to a recuperated gas turbine configuration? #8 Assuming you maintain the same power output, how will a decrease in the compressor inlet air temperature effect a gas turbine engine's efficiency and fuel consumption? #9 On a gas turbine engine, a high outside air temperature can cause high turbine inlet temperature, low mass/weight of airflow through the turbine, and which of the following conditions? #10 Assuming that the turbine inlet temperature of a gas turbine engine remains constant, which of the following operating parameter changes would be noted with an increase in the compressor inlet air temperature? #11 What design feature is incorporated into the main propulsion gas turbine to eliminate compressor surge? #12 What is the designed compressor pressure ratio of the gas turbine compressor rotor shown in the illustration? Illustration GT-0004 #13 Which of the following components are installed in the lube oil system shown in the illustration? Illustration GT-0024 #14 How many lube oil sumps are installed on the marine gas turbine engine shown in the illustration? Illustration GT-0024 #15 Which of the following is true concerning the main engine lube oil system of the marine gas turbine shown in the illustration? Illustration GT-0024 #16 Lubricating oil contamination in a gas turbine bearing oil sump will most likely come from which of the following? #17 The Main Fuel Control module used on a marine gas turbine engine as shown in the illustration, is responsible for managing which function(s)? Illustration GT-0021 #18 A fuel analysis report for a gas turbine propelled vessel indicates a calcium level in excess of 0.5 ppm. High calcium levels in distillate fuels for gas turbines can cause which of the following? #19 A gas turbine engine is experiencing a high rate of corrosion in the hot section of the engine. Which of the following fuel contamination issues could be associated with this problem? #20 During an operation of a gas turbine equipped with an intercooler and recuperator, a low combustion air temperature to the combustor section could be caused by which of the following? #21 On a gas turbine powered vessel equipped with a synchro self shifting (SSS) clutch, you are preparing for a power turbine over speed test. What would be an important action to take prior to starting the engine? #22 What type of main reduction gear arrangement prevents independent axial and rotational movement of the pinions? #23 The main thrust bearing directly positions which part(s) of the main reduction gear? #24 Gear backlash is best described as which of the following? #25 On a gas turbine powered vessel, what is the last step after an off-line water wash? #26 On a gas turbine propulsion vessel, you notice a slow but steady increase in gas turbine vibration and specific fuel consumption as the voyage has progressed. What would be a good maintenance technique to use to correct these increases? #27 When conducting a borescope inspection of the compressor, why can Airfoil and tip cracks be difficult to detect? #28 When inspecting the combustion section of a gas turbine engine, what wattage light source should you use? #29 A reddish -colored oxide usually forms on which of the following metals? #30 A white-gray powdery deposit can usually found on which of the following metals?
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