Q622 - 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. Which of the following terms refers to axial compressor stator blades?Not learned 3. Which of the following conditions permits a gas turbine to produce 100% power?Not learned 4. How do the high-velocity high-temperature gases cause the gas turbine rotor to rotate?Not learned 5. In a gas turbine, the air charge is permitted to be compressed adiabatically by what factor, process, or condition?Not learned 6. The Brayton Cycle is a series of events best described by which of the following statements?Not learned 7. 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 8. Which of the following is an advantage of a single-shaft gas turbine engine compared to a split-shaft gas turbine engine?Not learned 9. What type of air seal is used in the sump and turbine areas of a gas turbine engine?Not learned 10. What type of air seal is used in the combustor and turbine midframe of a gas turbine?Not learned 11. What type of seal is used in the gearbox of a gas turbine engine?Not learned 12. What type of starter is commonly used on smaller gas turbine engines?Not learned 13. What type of main reduction gear arrangement prevents independent axial and rotational movement of the pinions?Not learned 14. The purpose of the main reduction gear in a marine gas turbine propulsion installation is which of the following?Not learned 15. 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 16. How many shock mounts are used to secure the GE LM2500 gas turbine enclosure to the ship's foundation?Not learned 17. Where are the carbon dioxide nozzles located in the GE LM2500 gas turbine enclosure?Not learned 18. 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 19. The struts of the GE LM2500 compressor front frame provide passages for all of the following mediums EXCEPT which of the following?Not learned 20. What is the primary purpose of the diffuser and distributor on the GE LM2500 gas turbine?Not learned 21. Which of the following components prevent(s) objects smaller than 1/4 inch from entering the GE LM2500 gas turbine?Not learned 22. How is the HP turbine rotor of the GE LM2500 gas turbine cooled?Not learned 23. For the GE LM2500 gas turbine shown in the illustration, the 9th stage bleed air is used for which of the followingNot learned 24. 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 25. Aboard ship, single-shaft gas turbines are used mostly as prime movers for which of the following applications?Not learned 26. Accelerating the compressor to the self-sustaining speed of the engine is the function of which of the following components?Not learned 27. Which of the following components removes the oil from the transfer gearbox?Not learned 28. On the marine gas turbine engine shown in the illustration, the 8th stage bleed air is used for which of the followingNot learned 29. In the ignition system of a gas turbine engine, how is optimum spark achieved?Not learned 30. What is the most common type of spark igniter used on a gas turbine engine?Not learned 31. What is the purpose of the Controllable-Pitch Propeller (CPP) hydraulic oil power system?Not learned 32. 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 33. On a ship with a marine gas turbine as shown in the illustration, a fire emergency stop is initiated when __________Not learned 34. The two main types of compressor stall are known as what?Not learned 35. 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 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. What is the disadvantage of a dual-entry centrifugal compressor compared to a single-entry centrifugal compressor?Not learned 39. Each stage of an axial compressor of a gas turbine can compress the atmospheric air a total of how many times?Not learned 40. A centrifugal flow gas turbine uses what type of combustion chamber?Not learned 41. What type of combustor is used by the GE LM2500 gas turbine engine?Not learned 42. 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 43. What is the function of the stator in an axial gas turbine compressor?Not learned 44. The turbine nozzle blades convert the combustion gases heat and pressure energy into what form of energy?Not learned 45. The turbine nozzles function to direct the gases in what direction?Not learned 46. The fuel oil system of a gas turbine engine provides all EXCEPT which of the following?Not learned 47. Which of the following statements is true concerning the fuel oil ignition system of the gas turbine engine shown in the illustrationNot learned 48. Marine GTE fuel oil systems, as shown in the illustration, require fuel oil shutdown valves to be _________Not learned 49. What is the purpose of the spring in a lip-type oil seal?Not learned 50. What is the purpose of the air/oil separator shown in the illustration of the gas turbine lube oil systemNot learned 51. For the gas turbine engine lube oil system shown in the illustration, what is the purpose of the lube oil supply check valvesNot learned 52. The lube oil scavenge pressure on the gas turbine engine shown in the illustration is sensed by which of the followingNot learned 53. A gas turbine engine's main lube oil system pump check valve serves to maintain system prime and perform what other function?Not learned 54. How is the lube oil supplied to each bearing in a gas turbine engine controlled?Not learned 55. 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 56. The main lubrication system utilized by the gas turbine engine shown in the illustration is what typeNot learned 57. 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 58. What is the primary function of the main fuel control on the GE LM2500 gas turbine engine?Not learned 59. Wrenches that are recommended for use on gas turbine engines should be plated with which of the following elements?Not learned 60. 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 61. Routine water washing of the gas turbine compressor shown in the illustration, is usually performed while operating under which of the following conditionsNot learned 62. Accelerometers are generally used on gas turbine engines to sense which of the following?Not learned 63. The acronym CDP stands for which of the following?Not learned 64. The acronym FOD stands for which of the following?Not learned 65. The acronym MFC represents which of the following?Not learned 66. The acronym VSV represents which of the following?Not learned 67. While air is being compressed in a centrifugal flow gas turbine, what happens to the direction of air flow?Not learned 68. Air used to cool the combustion liners and turbine components is referred to as which of the following?Not learned 69. Assuming at least a 500 rpm for the input shaft speed from the power turbine, as shown in the illustration, the synchronous self-shifting (SSS) clutch used on marine gas turbine main propulsion gears, requires which of the following inputs or conditions to make engagement possibleNot learned 70. An axial compressor basically consists of which of the following?Not learned 71. An axial compressor stage is represented by which of the following components and in which order?Not learned 72. 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 73. The bleed air surge relief valve differs from a normal relief valve in which of the following ways?Not learned 74. Borescope inspection of the combustor section requires which type of light source?Not learned 75. A centrifugal compressor assembly consists of which of the following?Not learned 76. 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 77. How is the clutch shown in the attached illustration engagedNot learned 78. Compressor characteristics are normally summarized in the form of which of the following?Not learned 79. What is a compressor midspan shroud?Not learned 80. A compressor is operating at an inlet pressure of 14.7 (atmospheric pressure at the time of measurement) and a compressor discharge pressure of 123 psig. Calculate the absolute pressure ratio across the compressor.Not learned 81. When a compressor is in a stall condition, what will happen to the combustor and turbine temperatures?Not learned 82. How can compressor stall be prevented?Not learned 83. Compressor surge is caused by which of the following factors?Not learned 84. When conducting a borescope inspection, you must be aware of all of the following factors EXCEPT which?Not learned 85. Why is the cycle efficiency higher in the intercooled-recuperated cycle as compared to a simple cycle gas turbineNot learned 86. What is the difference between an open cycle and a closed cycle gas turbine engine?Not learned 87. Displacement, velocity and acceleration describe three types of which of the following?Not learned 88. The electrostatic vent fog precipitator removes oil mist from which of the following areas?Not learned 89. Which of the following could cause compressor stall?Not learned 90. Which of the following designs is the most satisfactory method for attaching turbine blades to the rotor disk?Not learned 91. Which of the following is NOT a gas turbine auto shutdown parameter?Not learned 92. Which of the following is the main advantage of a split-axial compressor case?Not learned 93. Which of the following are the principle factors that affect the performance of a gas turbine compressor?Not learned 94. Which of the following statements correctly describes force?Not learned 95. Which of the following statements is true concerning axial compressor disk-type rotors?Not learned 96. Which of the following statements is true about the "lockout control" on a synchronous self-shifting (SSS) clutch?Not learned 97. Which of the following statements is true regarding centrifugal compressors?Not learned 98. Which of the following terms refers to thermal energy in transition?Not learned 99. Which of the following wrenches should NOT be used while working on a gas turbine?Not learned 100. The gas generating sections of marine gas turbine engines are based on which of the following?Not learned 101. Why is a gas turbine considered to operate on the Brayton cycle?Not learned 102. In a gas turbine engine, the majority of the energy is added to the working fluid in which of the following components?Not learned 103. Gas turbine fuel manifold pressure is established by which of the following actions?Not learned 104. 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 105. 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 106. Most GTE fuel nozzles have passages for all of the following except ____________.Not learned 107. The only hand tools that should be used on gas turbine engines are chrome plated, nickel plated, or which of the following?Not learned 108. HP turbine blades are generally cooled by which of the following methods?Not learned 109. To keep the exit pressures relatively constant across a HP turbine blade, which type of construction is generally utilized?Not learned 110. Kelvin is the absolute temperature scale that corresponds to which of the following?Not learned 111. The lube oil system shown in the illustration, consists of which of the following sub-systemsNot learned 112. The lube oil system shown in the illustration, is designed to lubricate the main bearings by what principleNot learned 113. A magnet pickup typically produces what type of signal output?Not learned 114. 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 115. How do you manually lockout an SSS clutch?Not learned 116. On most marine gas turbines used aboard ships, vibration sensors are identified as which of the following?Not learned 117. Mechanical work is defined as which of the following?Not learned 118. What method is utilized to allow turbine nozzle blades to withstand high inlet temperatures?Not learned 119. An open cycle gas turbine engine is best described by which of the following statements?Not learned 120. 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 121. Potential energy is defined as which of the following?Not learned 122. Power is defined as which of the following?Not learned 123. What is the primary function of an axial compressor rotor blade?Not learned 124. 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 125. As shown in the illustration, what is the purpose of pressurizing the main bearing lube oil sumps on a typical marine gas turbineNot learned 126. In a single shaft, cold-end drive gas turbine, the power output speed has what relationship to the speed of the compressor?Not learned 127. Under standard atmospheric conditions, 208.7 PSIG converts to approximately what in absolute pressure?Not learned 128. A temperature of 32.5 degrees Celsius converts to approximately what temperature in degrees Kelvin?Not learned 129. A temperature of 69.5 degrees Fahrenheit converts to approximately what temperature in degrees Rankine?Not learned 130. What is the term given to the condition in which cyclic pressure changes result in a repetitive failure and recovery of compressor air flow?Not learned 131. What is the term given to a process that occurs without a loss or gain of heat?Not learned 132. What is the term used to describe the stationary vanes preceding the first stage of an axial compressor?Not learned 133. The thermal energy added to the gas as it flows through the combustion section has what effect on the gas?Not learned 134. Thermal energy is the only form of energy that can be added to or removed from a substance. How is thermal energy that is added to a substance stored?Not learned 135. The three most common types of combustors used in gas turbine engines are which of the following?Not learned 136. Turbine disks are commonly attached to the shaft by which of the following methods?Not learned 137. The turbine nozzle blades convert the combustion gases heat and pressure energy into what form of energy?Not learned 138. The turbine nozzles convert heat and pressure energy to velocity energy by means of which of the following?Not learned 139. A turbine stage is represented by which of the following components and in which order?Not learned 140. Two functions of the compressor stator vanes include which of the following?Not learned 141. What are the two primary sources of deposits that build up on compressor blades?Not learned 142. What are the two principal functions of the turbine nozzle guide vanes?Not learned 143. What type of engine starter motor is commonly found on the marine gas turbine shown in the illustrationNot learned 144. Variable stator vanes give an axial gas turbine compressor which of the following capabilities?Not learned 145. 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 146. For the GE LM2500 gas turbine engine shown in the illustration, the 13th stage bleed air is used for which of the followingNot learned 147. 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