Q606 - Gas Turbine Plants, USCG prep certification 2026

Progress: 24% (23/94)

Learning progress ?

1. Active corrosion on copper alloys is indicated by which of the following?Not learned 2. Which of the following terms refers to axial compressor stator blades?Not learned 3. 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 4. Which of the following is an advantage of a single-shaft gas turbine engine compared to a split-shaft gas turbine engine?Not learned 5. What type of air seal is used in the sump and turbine areas of a gas turbine engine?Not learned 6. What type of air seal is used in the combustor and turbine midframe of a gas turbine?Not learned 7. What type of seal is used in the gearbox of a gas turbine engine?Not learned 8. The main thrust bearing directly positions which part(s) of the main reduction gear?Not learned 9. What type of main reduction gear arrangement prevents independent axial and rotational movement of the pinions?Not learned 10. The purpose of the main reduction gear in a marine gas turbine propulsion installation is which of the following?Not learned 11. What does the term "lock-out" of a synchro-self-shifting (SSS) clutch system meanNot learned 12. What is the purpose of the GE LM2500 gas turbine enclosure heater?Not learned 13. How many shock mounts are used to secure the GE LM2500 gas turbine enclosure to the ship's foundation?Not learned 14. 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 15. The struts of the GE LM2500 compressor front frame provide passages for all of the following mediums EXCEPT which of the following?Not learned 16. What is the primary purpose of the diffuser and distributor on the GE LM2500 gas turbine?Not learned 17. Which of the following components prevent(s) objects smaller than 1/4 inch from entering the GE LM2500 gas turbine?Not learned 18. For the GE LM2500 gas turbine shown in the illustration, the 9th stage bleed air is used for which of the followingNot learned 19. 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 20. 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 21. In a regenerative or recuperative gas turbine cycle configuration, the heat of the turbine exhaust gas is used to do what?Not learned 22. 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 23. The secondary passages on the gas turbine engine fuel nozzles shown in the illustration are designed to open at approximately what pressureNot learned 24. 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 25. On a ship with a marine gas turbine as shown in the illustration, a fire emergency stop is initiated when __________Not learned 26. The two main types of compressor stall are known as what?Not learned 27. 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 28. 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 29. 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 30. What action should you take if full power vibration limits are exceeded on a gas turbine engine?Not learned 31. Your first step in response to a gas turbine engine high lube oil sump temperature alarm would be which of the following?Not learned 32. In which of the following ways can compressor surge cause excessive temperatures in the turbine section?Not learned 33. 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 34. 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 35. Which of the following is the most likely cause for the main propulsion gas turbine engine tripping during start up?Not learned 36. A pressure stage of an axial-type compressor consists of which of the following?Not learned 37. Why are loose-fitting blades used on the first several stages of large axial compressors?Not learned 38. Each stage of an axial compressor of a gas turbine can compress the atmospheric air a total of how many times?Not learned 39. Compressor tip clang can be usually attributed to which of the following operating conditions?Not learned 40. Compressor rotor blade tip curl is usually caused by which of the following?Not learned 41. Once a compressor is broken in, which of the following factors will most likely cause blade tips to rub?Not learned 42. A centrifugal flow gas turbine uses what type of combustion chamber?Not learned 43. What type of combustor is used by the GE LM2500 gas turbine engine?Not learned 44. 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 45. 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 46. What is the function of the stator in an axial gas turbine compressor?Not learned 47. The turbine nozzles function to direct the gases in what direction?Not learned 48. How many stages are in the HP turbine of the GE LM2500 gas turbine engine?Not learned 49. The power turbine (PT) of the GE LM2500 gas turbine engine has a total of how many stages?Not learned 50. The lube oil scavenge pressure on the gas turbine engine shown in the illustration is sensed by which of the followingNot learned 51. A gas turbine engine's main lube oil system pump check valve serves to maintain system prime and perform what other function?Not learned 52. How is the lube oil supplied to each bearing in a gas turbine engine controlled?Not learned 53. 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 54. Lubricating oil contamination in a gas turbine bearing oil sump will most likely come from which of the following?Not learned 55. 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 56. 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 57. 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 58. When performing a static check to determine tooth contact, you should use which of the following compounds to coat the gear teeth?Not learned 59. The buildup of contamination in a gas turbine will cause all of the following conditions EXCEPT which of the following?Not learned 60. 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 61. 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 62. Zero reference for the GE LM2500 gas turbine engine is established by the use of which of the following engine components?Not learned 63. When conducting a borescope inspection of the compressor, why can airfoil and tip cracks be difficult to detect?Not learned 64. When dissimilar metals come in contact with a conductor, which of the following types of metal deterioration takes place?Not learned 65. A reddish-colored oxide usually forms on which of the following metals?Not learned 66. A white-gray powdery deposit can usually be found on which of the following metals?Not learned 67. 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 68. A compressor blade platform that is tilted or raised may indicate which of the following failures?Not learned 69. The dimples of a combustor dome band that has a low operating time will usually have what kind of damage?Not learned 70. Distortion of the combustor liner assembly is evident when you observe which of the following conditions?Not learned 71. A safety valve on an auxiliary boiler simmers constantly and cannot be stopped by several quick blow-offs using the hand-relieving gear. The problem may be __________.Not learned 72. A variable capacity, pressure atomizing, fuel oil burner functions to __________.Not learned 73. Casing drains may be required on a waste heat boiler gas passage side to __________.Not learned 74. In general, diesel engine waste heat boiler construction is usually of the _________.Not learned 75. With which of the following types of diesel engine arrangements is a waste heat boiler most likely to produce the maximum steam pressure, temperature, and flow conditions?Not learned 76. As shown in the illustration, the main function of the valve labeled "6" would be to ________Not learned 77. As shown in the illustration, what component would normally be installed at location "I"Not learned 78. Auxiliary boilers are divided into several classifications, one of which is __________.Not learned 79. The gauge glass on a coil-type auxiliary boiler is connected to the __________.Not learned 80. Heavy soot accumulations in an auxiliary boiler could be caused by __________.Not learned 81. A feed pump for an auxiliary boiler might lose suction if the __________.Not learned 82. Which of the listed problems will happen when the water level of a fire-tube type auxiliary boiler approaches the crown sheet?Not learned 83. Why should the main steam stop valve of an auxiliary boiler be eased off its seat and then gently closed before lighting off?Not learned 84. In the event of a flame failure in an auxiliary water-tube boiler, you must __________.Not learned 85. A burner producing black smoke in an automatic auxiliary boiler, would be caused by a/an __________.Not learned 86. Which of the following types of feedwater regulators is commonly used with a water-tube, natural circulation, auxiliary boiler?Not learned 87. When the steam pressure drops below a set value on an automatically fired auxiliary boiler fitted with rotary cup atomizers, the combustion control system will __________.Not learned 88. The solenoid valves in the fuel oil supply line to an automatically fired auxiliary boiler, are automatically closed by __________.Not learned 89. The primary function of a flame safeguard system, as used on an automatically fired auxiliary boiler, is to prevent what condition?Not learned 90. During unsafe firing conditions in a large automatic auxiliary boiler, various control actuators are interlocked with the burner circuit to prevent start-up, in addition to safety shutdown. These controls are referred to as __________.Not learned 91. Which of the automatic boiler controls listed should be tested prior to lighting off an auxiliary boiler?Not learned 92. Burner ignition failure in an automatically fired auxiliary boiler would be caused by __________.Not learned 93. While air is being compressed in a centrifugal flow gas turbine, what happens to the direction of air flow?Not learned 94. 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 95. 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 96. An axial compressor basically consists of which of the following?Not learned 97. An axial compressor stage is represented by which of the following components and in which order?Not learned 98. An axial compressor stator vane that is mechanically adjusted to provide optimum compressor performance over a wide operating range is referred to as which of the following?Not learned 99. The boiler shown in the illustration would be classed as __________Not learned 100. A centrifugal compressor assembly consists of which of the following?Not learned 101. 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?Not learned 102. What is a compressor midspan shroud?Not learned 103. 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 104. When conducting a borescope inspection, you must be aware of all of the following factors EXCEPT which?Not learned 105. What is the designed compressor pressure ratio of the gas turbine compressor rotor shown in the illustrationNot learned 106. The divergent area of the exhaust duct aids in what process?Not learned 107. To ensure minimum clearance between rotor blade tips and the casing of an axial compressor, manufacturers use which of the following techniques?Not learned 108. Which of the following conditions will NOT be the result of a build-up of deposits in a gas turbine compressor?Not learned 109. Which of the following designs is the most satisfactory method for attaching turbine blades to the rotor disk?Not learned 110. Which of the following is the main advantage of a split-axial compressor case?Not learned 111. Which of the following statements about the intercooled-recuperated gas turbine cycle is trueNot learned 112. Which of the following statements is true concerning axial compressor disk-type rotors?Not learned 113. Which of the following statements is true regarding centrifugal compressors?Not learned 114. Which of the following is true concerning the main engine lube oil system of the marine gas turbine shown in the illustrationNot learned 115. The fuel oil back pressure regulator on the fuel system shown in the illustration, returns fuel to which of the followingNot learned 116. Fuel oil manifolds are shrouded on marine gas turbine installations for which of the following reasons?Not learned 117. The fuel oil service system normally delivers fuel to a marine propulsion gas turbine engine at a nominal pressure of __________.Not learned 118. The fuel oil service system supply pressure to the marine gas turbine engine shown in the illustration, is designed to be regulated at approximately ______Not learned 119. The fuel purge valve on the marine gas turbine shown in the illustration, is opened _________Not learned 120. In a gas turbine engine, the majority of the energy is added to the working fluid in which of the following components?Not learned 121. On a gas turbine powered vessel, what is the last step after an off-line water wash?Not learned 122. 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 123. 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 124. 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 125. What type of gas turbine cycle configuration is shown in the illustrationNot learned 126. Why are the high-pressure turbine blades generally of the impulse/reaction type?Not learned 127. HP turbine blades are generally cooled by which of the following methods?Not learned 128. To keep the exit pressures relatively constant across a HP turbine blade, which type of construction is generally utilized?Not learned 129. 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 130. How many fuel igniters would be installed on the marine gas turbine engine shown in the illustrationNot learned 131. On marine gas turbines equipped with fuel oil nozzles as shown in the illustration, the minimum fuel oil manifold pressure for proper operation should be _________Not learned 132. What method is utilized to allow turbine nozzle blades to withstand high inlet temperatures?Not learned 133. 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 134. 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 135. What is the primary function of an axial compressor rotor blade?Not learned 136. Provisions for avoiding the buildup of ice on the intake air surfaces of a gas turbine plant can be found where?Not learned 137. Why is safety-wiring, or lock wiring of gas turbine parts required?Not learned 138. As shown in the illustration, the component labeled "N" would be identified as a ________Not learned 139. In a single shaft, cold-end drive gas turbine, the power output speed has what relationship to the speed of the compressor?Not learned 140. 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 141. What is the term used to describe the stationary vanes preceding the first stage of an axial compressor?Not learned 142. The three most common types of combustors used in gas turbine engines are which of the following?Not learned 143. Turbine disks are commonly attached to the shaft by which of the following methods?Not learned 144. The turbine nozzle blades convert the combustion gases heat and pressure energy into what form of energy?Not learned 145. The turbine nozzles convert heat and pressure energy to velocity energy by means of which of the following?Not learned 146. Turbine stages are generally sealed to prevent gas leakage by which of the following methods?Not learned 147. A turbine stage is represented by which of the following components and in which order?Not learned 148. The two basic types of compressors used in gas turbine engines are which of the following?Not learned 149. Two functions of the compressor stator vanes include which of the following?Not learned 150. What are the two principal functions of the turbine nozzle guide vanes?Not learned 151. What type of metallurgical failure does Item A represent in the illustrationNot learned 152. While underway on a ship with gas turbine engines, the most likely indication of an engine stall is which of the following?Not learned 153. Variable stator vanes give an axial gas turbine compressor which of the following capabilities?Not learned 154. A photoelectric cell installed in an automatically fired auxiliary boiler burner management system __________.Not learned 155. In the water level electrode assembly, shown in the illustration, the feed pump should restart when the level of the water reaches the position indicated by arrow '____'Not learned 156. Control of the fuel oil metering valve in an automatically fired boiler is accomplished by a __________.Not learned