MEWB - Gas Turbine Plants, USCG prep certification 2026

Progress: 24% (23/94)

Learning progress ?

1. Compared to other types of engines, what is the biggest advantage of a gas turbine engine?Not learned 2. The term "divergent" is best described as which of the following?Not learned 3. Which of the following terms refers to axial compressor stator blades?Not learned 4. What are the two common forms of axial compressor rotor blade roots?Not learned 5. In the operation of a marine propulsion gas turbine, kinetic and thermal energy required to drive the main propeller shaft are extracted by which of the following?Not learned 6. Which of the following conditions permits a gas turbine to produce 100% power?Not learned 7. How do the high-velocity high-temperature gases cause the gas turbine rotor to rotate?Not learned 8. In a gas turbine, the air charge is permitted to be compressed adiabatically by what factor, process, or condition?Not learned 9. An open cycle gas turbine engine is best described by which of the following statements?Not learned 10. The Brayton Cycle is a series of events best described by which of the following statements?Not learned 11. A gas turbine engine in which exhaust gas heat energy is added to the air charge between the compressor and combustion chamber is classified as which of the following?Not learned 12. 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 a centrifugal type compressor?Not learned 13. Which type of GTE can handle a larger volume of air?Not learned 14. Which of the following is an advantage of a single-shaft gas turbine engine compared to a split-shaft gas turbine engine?Not learned 15. In a twin-spool turbine, secondary air is most essential for cooling in what section?Not learned 16. What type of air seal is used in the sump and turbine areas of a gas turbine engine?Not learned 17. What type of air seal is used in the combustor and turbine midframe of a gas turbine?Not learned 18. What type of seal is used in the gearbox of a gas turbine engine?Not learned 19. Ball or roller antifriction bearings are used to support GTE rotors for all EXCEPT which of the following?Not learned 20. What type of starter is commonly used on smaller gas turbine engines?Not learned 21. What type of engine starter motor is commonly found on the marine gas turbine shown in the illustrationNot learned 22. The main thrust bearing directly positions which part(s) of the main reduction gear?Not learned 23. The purpose of the main reduction gear in a marine gas turbine propulsion installation is which of the following?Not learned 24. What type of main reduction gear arrangement prevents independent axial and rotational movement of the pinions?Not learned 25. The purpose of the main reduction gear in a marine gas turbine propulsion installation is which of the following?Not learned 26. What feature is commonly used on articulated reduction gear arrangements for the correction of misalignment between the 1st reduction gear and the 2nd reduction pinions?Not learned 27. What does the term "lock-out" of a synchro-self-shifting (SSS) clutch system meanNot learned 28. What is the purpose of the GE LM2500 gas turbine enclosure heater?Not learned 29. How many shock mounts are used to secure the GE LM2500 gas turbine enclosure to the ship's foundation?Not learned 30. Where are the carbon dioxide nozzles located in the GE LM2500 gas turbine enclosure?Not learned 31. The gas generator section of the GE LM2500 gas turbine is composed of all of the following components EXCEPT which of the following?Not learned 32. The struts of the GE LM2500 compressor front frame provide passages for all of the following mediums EXCEPT which of the following?Not learned 33. What is the primary purpose of the diffuser and distributor on the GE LM2500 gas turbine?Not learned 34. Which of the following components prevent(s) objects smaller than 1/4 inch from entering the GE LM2500 gas turbine?Not learned 35. How is the HP turbine rotor of the GE LM2500 gas turbine cooled?Not learned 36. For the GE LM2500 gas turbine shown in the illustration, the 9th stage bleed air is used for which of the followingNot learned 37. For the GE LM2500 gas turbine shown in the illustration, the 9th stage bleed air is used for which of the followingNot learned 38. In the marine gas turbine engine shown in the illustration, the HP turbine 2nd stage nozzle vanes are cooled by which of the followingNot learned 39. As shown in the illustration, the HP turbine 2nd stage blades are cooled by convection, with the cooling air being discharged at which of the followingNot learned 40. For the GE LM2500 gas turbine engine shown in the illustration, the HP turbine 1st stage nozzle vanes are cooled by which of the followingNot learned 41. Boyle's law can best be defined as _________.Not learned 42. 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"Not learned 43. 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?Not learned 44. 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?Not learned 45. 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?Not learned 46. What type of gas turbine cycle configuration is shown in the illustrationNot learned 47. In a regenerative or recuperative gas turbine cycle configuration, the heat of the turbine exhaust gas is used to do what?Not learned 48. Based on the data shown in the illustration, which statement of the following is correctNot learned 49. For the same amount of available power, how does a low-speed two-stroke diesel engine compare to a recuperated gas turbine configuration?Not learned 50. Which of the following statements about the intercooled-recuperated gas turbine cycle is trueNot learned 51. For shipboard main propulsion application, how does an intercooled-recuperated (ICR) cycle gas turbine configuration compare to a combined cycle gas turbine configuration?Not learned 52. 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?Not learned 53. What design feature is incorporated into the main propulsion gas turbine to eliminate compressor surge?Not learned 54. What is the designed compressor pressure ratio of the gas turbine compressor rotor shown in the illustrationNot learned 55. The secondary passages on the gas turbine engine fuel nozzles shown in the illustration are designed to open at approximately what pressureNot learned 56. What does the term "lock-out" of a synchro-self-shifting (SSS) clutch system meanNot learned 57. As shown in the illustration, the Synchro-Self-Shifting (SSS) clutch used on the marine gas turbine gears, requires which of the following inputs or conditions to make engagement possibleNot learned 58. How is the clutch shown in the attached illustration engagedNot learned 59. On a gas turbine powered vessel equipped with a synchro-self-shifting (SSS) clutch, you are preparing for a power turbine overspeed test. What would be an important action to take prior to starting the engine?Not learned 60. Aboard ship, single-shaft gas turbines are used mostly as prime movers for which of the following applications?Not learned 61. Accelerating the compressor to the self-sustaining speed of the engine is the function of which of the following components?Not learned 62. During a "hung start" of a GTE, which of the following conditions will occur?Not learned 63. Which of the following components removes the oil from the transfer gearbox?Not learned 64. The electrostatic vent fog precipitator removes oil mist from which of the following areas?Not learned 65. When the main reduction gear lube oil system is secured, which of the following components maintains the air within the casing at less than 35 percent relative humidity?Not learned 66. On the marine gas turbine engine shown in the illustration, the 8th stage bleed air is used for which of the followingNot learned 67. What is the approximate percentage of air extracted from the compressor that is mixed with fuel for combustion in a gas turbine?Not learned 68. What is the power source for the ignition exciter of a gas turbine engine?Not learned 69. In the ignition system of a gas turbine engine, how is optimum spark achieved?Not learned 70. What is the most common type of spark igniter used on a gas turbine engine?Not learned 71. On some marine gas turbine reduction gear arrangements, the reduction gear lube-oil supply pump may also supply oil to which of the following components?Not learned 72. What is the purpose of the Controllable-Pitch Propeller (CPP) hydraulic oil power system?Not learned 73. On a propulsion marine gas turbine, if full power temperatures become excessive, what action should the operator take?Not learned 74. You are on watch on a gas turbine propelled vessel as shown in the illustration. After reducing power in response to a high lube oil supply temperature alarm, the temperature continues to increase. Your next step should be which of the followingNot learned 75. On a vessel equipped with marine propulsion gas turbines, the operator’s initial response to a high vibration alarm should be which of the following?Not learned 76. On a ship with a marine gas turbine as shown in the illustration, a fire emergency stop is initiated when __________Not learned 77. The two main types of compressor stall are known as what?Not learned 78. In order to get a ready indication for a normal start with a GE LM2500 gas turbine engine, what permissive(s) must be met?Not learned 79. On a gas turbine engine, a high outside air temperature can cause high turbine inlet temperature, low mass/weight of air flow through the turbine, and which of the following conditions?Not learned 80. 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?Not learned 81. What action should you take if full power vibration limits are exceeded on a gas turbine engine?Not learned 82. To prevent overheating of the illustrated turbine blade, which of the following fluids is circulated through it via the shaped internal passagesNot learned 83. Which of the following is the most probable cause for the sump oil to be excessively aerated on an aeroderivative main propulsion gas turbine engine?Not learned 84. Your first step in response to a gas turbine engine high lube oil sump temperature alarm would be which of the following?Not learned 85. Which of the following is the most probable cause if, while underway, the main propulsion gas turbine air intake blow-in doors open?Not learned 86. While underway on a ship with gas turbine engines, the most likely indication of an engine stall is which of the following?Not learned 87. In which of the following ways can compressor surge cause excessive temperatures in the turbine section?Not learned 88. On the marine gas turbine engine shown in the illustration, what temperature should be carefully monitored following a shutdown for an engine fireNot learned 89. On a ship with a marine gas turbine as shown in the illustration, a fire emergency stop is initiated when __________Not learned 90. 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?Not learned 91. You are on watch on a gas turbine propelled vessel as shown in the illustration. After reducing power in response to a high lube oil supply temperature alarm, the temperature continues to increase. Your next step should be which of the followingNot learned 92. 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?Not learned 93. Which of the following is the most likely cause for the main propulsion gas turbine engine tripping during start up?Not learned 94. A pressure stage of an axial-type compressor consists of which of the following?Not learned 95. Why are loose-fitting blades used on the first several stages of large axial compressors?Not learned 96. What is the disadvantage of a dual-entry centrifugal compressor compared to a single-entry centrifugal compressor?Not learned 97. Each stage of an axial compressor of a gas turbine can compress the atmospheric air a total of how many times?Not learned 98. What is a midspan platform?Not learned 99. Compressor tip clang can be usually attributed to which of the following operating conditions?Not learned 100. Compressor rotor blade tip curl is usually caused by which of the following?Not learned 101. Once a compressor is broken in, which of the following factors will most likely cause blade tips to rub?Not learned 102. The basic components of a gas turbine gas generator include which of the following?Not learned 103. A centrifugal flow gas turbine uses what type of combustion chamber?Not learned 104. The short length of the can-annular combustion chamber provides for which of the following conditions?Not learned 105. 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 ______Not learned 106. What type of combustor is used by the GE LM2500 gas turbine engine?Not learned 107. 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?Not learned 108. The purpose of the metal spray rub coating on the rotor and stator casing of an axial-type compressor is which of the following?Not learned 109. What is the function of the stator in an axial gas turbine compressor?Not learned 110. Which of the following designs is the most satisfactory method for attaching turbine blades to the rotor disk?Not learned 111. Turbine disks are commonly attached to the shaft by which of the following methods?Not learned 112. What are two common methods of power turbine blade retention?Not learned 113. The turbine nozzle blades convert the combustion gases heat and pressure energy into what form of energy?Not learned 114. The turbine nozzles function to direct the gases in what direction?Not learned 115. What method is utilized to allow turbine nozzle blades to withstand high inlet temperatures?Not learned 116. How many stages are in the HP turbine of the GE LM2500 gas turbine engine?Not learned 117. The power turbine (PT) of the GE LM2500 gas turbine engine has a total of how many stages?Not learned 118. The fuel oil system of a gas turbine engine provides all EXCEPT which of the following?Not learned 119. Which of the following statements is true concerning the fuel oil ignition system of the gas turbine engine shown in the illustrationNot learned 120. On the marine gas turbine shown in the illustration, the fuel oil inlet temperature is sensed by ______Not learned 121. 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 which of the followingNot learned 122. How many fuel igniters would be installed on the marine gas turbine engine shown in the illustrationNot learned 123. The fuel oil back pressure regulator on the fuel system shown in the illustration, returns fuel to which of the followingNot learned 124. The purpose of the air shroud (swirl cup) around the tip of the fuel nozzle of an LM2500 GTE is to ______.Not learned 125. Marine GTE fuel oil systems, as shown in the illustration, require fuel oil shutdown valves to be _________Not learned 126. What is the purpose of the spring in a lip-type oil seal?Not learned 127. As shown in the illustration, what is the purpose of pressurizing the main bearing lube oil sumps on a typical marine gas turbineNot learned 128. Petroleum based lubricating oils are NOT suitable for use in GTEs for which of the following reasons?Not learned 129. The lube oil system shown in the illustration, is designed to lubricate the main bearings by what principleNot learned 130. What is the purpose of the air/oil separator shown in the illustration of the gas turbine lube oil systemNot learned 131. For the gas turbine engine lube oil system shown in the illustration, what is the purpose of the lube oil supply check valvesNot learned 132. The lube oil scavenge pressure on the gas turbine engine shown in the illustration is sensed by which of the followingNot learned 133. A gas turbine engine's main lube oil system pump check valve serves to maintain system prime and perform what other function?Not learned 134. How is the lube oil supplied to each bearing in a gas turbine engine controlled?Not learned 135. On the gas turbine lube oil system shown in the illustration, air and oil are primarily separated in the air/oil separator through the use of which of the followingNot learned 136. The main lubrication system utilized by the gas turbine engine shown in the illustration is what typeNot learned 137. On the marine gas turbine engine as shown in the illustration, the main lube oil system is cooled by ______Not learned 138. If the lube oil scavenge temperature exceeds 300 degrees Fahrenheit on the gas turbine engine shown in the illustration, and reducing power does NOT bring the temperature within limits, the operator should do which of the followingNot learned 139. The lube oil system shown in the illustration, consists of which of the following sub-systemsNot learned 140. The lubrication principal utilized by the Kingsbury thrust bearing is which of the following?Not learned 141. When working with gas turbine synthetic lube oil, which of the following safety measures should always be observed?Not learned 142. Which of the following components are installed in the lube oil system shown in the illustrationNot learned 143. How many lube oil sumps are installed on the marine gas turbine engine shown in the illustrationNot learned 144. Which of the following is true concerning the main engine lube oil system of the marine gas turbine shown in the illustrationNot learned 145. What type of main lube oil supply and scavenging pump is installed on the marine gas turbine engine shown in the illustrationNot learned 146. The lubrication principal utilized by the Kingsbury thrust bearing is which of the following?Not learned 147. The sensors which transmit remote system temperatures on marine gas turbines are usually constructed as ______.Not learned 148. On the marine gas turbine shown in the illustration, the power turbine inlet pressure probes would be mounted nearest the area labeled ______Not learned 149. On most marine gas turbines used aboard ships, vibration sensors are identified as which of the following?Not learned 150. On the marine gas turbine shown in the illustration, the compressor "inlet pressure" sensor would be located nearest the area labeled ______Not learned 151. On the gas turbine engine shown in the illustration, the "T5.4" thermocouples are ______Not learned 152. 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 occursNot learned 153. 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 beginsNot learned 154. On a ship with marine gas turbine engines as shown in the illustration, when the engine is operating normally, the enclosure heater will ______Not learned 155. In a gas turbine propulsion installation, the typical control system is designed to perform which of the following three functions?Not learned 156. What is the primary function of the main fuel control on the GE LM2500 gas turbine engine?Not learned 157. The main fuel control module used on a marine gas turbine engine as shown in the illustration, is responsible for managing which function(s)Not learned 158. On the marine gas turbine shown in the illustration, the gas generator speed sensor is located ______Not learned 159. On the marine gas turbine engine panel shown in the illustration, which of the following conditions would prevent the auto-start sequence from successfully completingNot learned 160. What type of pliers are designed to reduce the time used in twisting wire on nuts and bolts?Not learned 161. To gain access to a nut or bolt in an area that is hard to reach, you should use what type of wrench?Not learned 162. With the exception of having a slot cut in the wrench head, a flare nut wrench is similar to what other wrench?Not learned 163. Wrenches that are recommended for use on gas turbine engines should be plated with which of the following elements?Not learned 164. When you are using a stroboscope, if the flash speed is faster than the rpm of the object being tested, what effect will this appear to have on the object?Not learned 165. Which of the following instruments is designed to help you when performing an internal inspection of the gas turbine engine?Not learned 166. Cadmium plated tools should NOT be used when performing maintenance on gas turbines because cadmium particles may become imbedded and cause embrittlement in materials made of ______.Not learned 167. Inspection mirrors are commonly used for which of the following purposes?Not learned 168. All clock positions, engine references, and enclosure references apply to viewing the gas turbine engine shown in the illustration, from which of the following locationsNot learned 169. Routine water washing of the gas turbine compressor shown in the illustration, is usually performed while operating under which of the following conditionsNot learned 170. When removing the marine gas turbine engine as shown in the illustration, how is the engine removal accomplishedNot learned 171. Lubricating oil contamination in a gas turbine bearing oil sump will most likely come from which of the following?Not learned 172. 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?Not learned 173. 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?Not learned 174. Gear backlash is best described as which of the following?Not learned 175. In cases where both the pinion and gear teeth of the main reduction gear have been slightly indented by foreign material, what action should you take?Not learned 176. When performing a static check to determine tooth contact, you should use which of the following compounds to coat the gear teeth?Not learned 177. The buildup of contamination in a gas turbine will cause all of the following conditions EXCEPT which of the following?Not learned 178. Why is safety-wiring, or lock wiring of gas turbine parts required?Not learned 179. On a gas turbine powered vessel, what is the last step after an off-line water wash?Not learned 180. The effectiveness of an off-line water wash of a GE LM2500 gas turbine engine can be enhanced by doing which of the following?Not learned 181. 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?Not learned 182. How do you gain access to the burner units of a can-annular combustor to perform maintenance?Not learned 183. What are the two prime sources of deposits that build up on compressor blades?Not learned 184. You are preparing for a borescope inspection of a gas turbine engine. Prior to the inspection it is recommended that you do which of the following?Not learned 185. On a LM2500 gas turbine engine, you are instructed to check the "A" sump three o'clock strut for a potential stress crack. Standing at the compressor air intake, where would this point be located?Not learned 186. To manually rotate the GE LM2500 gas turbine engine, you should use which of the following tools?Not learned 187. It is good engineering practice for you to review the machinery history of an engine before an borescope inspection for all EXCEPT which of the following reasons?Not learned 188. You are preparing for a borescope inspection of an LM2500 gas turbine engine. You are reviewing the correct geometric orientation nomenclature which includes which of the following?Not learned 189. When conducting a borescope inspection, you must be aware of all of the following factors EXCEPT which?Not learned 190. The six borescope ports located in the compressor rear frame casing of the marine propulsion gas turbine shown, can be used to inspect all EXCEPT which of the following componentsNot learned 191. On a GE LM2500 gas turbine powered vessel you are conducting a borescope inspection of the compressor. What is used on each compressor stage as a reference for indexing the blades?Not learned 192. Zero reference for the GE LM2500 gas turbine engine is established by the use of which of the following engine components?Not learned 193. When conducting a borescope inspection of the compressor, why can airfoil and tip cracks be difficult to detect?Not learned 194. When inspecting the combustion section of a gas turbine engine, what wattage light source should you use?Not learned 195. When dissimilar metals come in contact with a conductor, which of the following types of metal deterioration takes place?Not learned 196. A reddish-colored oxide usually forms on which of the following metals?Not learned 197. A white-gray powdery deposit can usually be found on which of the following metals?Not learned 198. Cadmium and zinc coatings provide which of the following type of protection for the base metal?Not learned 199. What type of metallurgical failure does Item A represent in the illustrationNot learned 200. What type of metallurgical failure does Item B represent in the illustrationNot learned 201. You are conducting a borescope inspection of the compressor section of a GE 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?Not learned 202. A compressor blade platform that is tilted or raised may indicate which of the following failures?Not learned 203. When tip clang takes place on a gas turbine engine, the major damage occurs to what area of the blade?Not learned 204. You are conducting a borescope inspection of the combustor section of a GE 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?Not learned 205. The dimples of a combustor dome band that has a low operating time will usually have what kind of damage?Not learned 206. Distortion of the combustor liner assembly is evident when you observe which of the following conditions?Not learned