Q612 - Gas Turbine Plants, USCG prep certification 2026

Progress: 24% (23/94)

Learning progress ?

1. The leakage of air into the pump casing by way of the packing gland of a condensate pump, is prevented by __________.Not learned 2. Clean low-pressure steam drains are collected in the __________.Not learned 3. The atmospheric drain tank (ADT) normally drains to the _______.Not learned 4. Which of the following is the advantage of operating a typical closed feedwater system for a marine boiler when compared to an open feedwater system?Not learned 5. In the boiler steam and water system, pressure is highest in the __________.Not learned 6. Recirculation of the feedwater ensures a flow of water through the __________.Not learned 7. Compared to other types of engines, what is the biggest advantage of a gas turbine engine?Not learned 8. Which of the following terms refers to axial compressor stator blades?Not learned 9. How do the high-velocity high-temperature gases cause the gas turbine rotor to rotate?Not learned 10. In a gas turbine, the air charge is permitted to be compressed adiabatically by what factor, process, or condition?Not learned 11. The Brayton Cycle is a series of events best described by which of the following statements?Not learned 12. 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 13. Which of the following is an advantage of a single-shaft gas turbine engine compared to a split-shaft gas turbine engine?Not learned 14. What type of air seal is used in the sump and turbine areas of a gas turbine engine?Not learned 15. What type of air seal is used in the combustor and turbine midframe of a gas turbine?Not learned 16. What type of seal is used in the gearbox of a gas turbine engine?Not learned 17. What type of starter is commonly used on smaller gas turbine engines?Not learned 18. What type of main reduction gear arrangement prevents independent axial and rotational movement of the pinions?Not learned 19. The purpose of the main reduction gear in a marine gas turbine propulsion installation is which of the following?Not learned 20. 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 21. How many shock mounts are used to secure the GE LM2500 gas turbine enclosure to the ship's foundation?Not learned 22. Where are the carbon dioxide nozzles located in the GE LM2500 gas turbine enclosure?Not learned 23. What is the primary purpose of the diffuser and distributor on the GE LM2500 gas turbine?Not learned 24. How is the HP turbine rotor of the GE LM2500 gas turbine cooled?Not learned 25. For the GE LM2500 gas turbine shown in the illustration, the 9th stage bleed air is used for which of the followingNot learned 26. Aboard ship, single-shaft gas turbines are used mostly as prime movers for which of the following applications?Not learned 27. Accelerating the compressor to the self-sustaining speed of the engine is the function of which of the following components?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. What is the approximate percentage of air extracted from the compressor that is mixed with fuel for combustion in a gas turbine?Not learned 30. What is the power source for the ignition exciter of a gas turbine engine?Not learned 31. In the ignition system of a gas turbine engine, how is optimum spark achieved?Not learned 32. What is the most common type of spark igniter used on a gas turbine engine?Not learned 33. What is the purpose of the Controllable-Pitch Propeller (CPP) hydraulic oil power system?Not learned 34. On a propulsion marine gas turbine, if full power temperatures become excessive, what action should the operator take?Not learned 35. 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 36. On a ship with a marine gas turbine as shown in the illustration, a fire emergency stop is initiated when __________Not learned 37. The two main types of compressor stall are known as what?Not learned 38. 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 39. Why are loose-fitting blades used on the first several stages of large axial compressors?Not learned 40. What is the disadvantage of a dual-entry centrifugal compressor compared to a single-entry centrifugal compressor?Not learned 41. Each stage of an axial compressor of a gas turbine can compress the atmospheric air a total of how many times?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. 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 45. What is the function of the stator in an axial gas turbine compressor?Not learned 46. The turbine nozzles function to direct the gases in what direction?Not learned 47. The fuel oil system of a gas turbine engine provides all EXCEPT which of the following?Not learned 48. Which of the following statements is true concerning the fuel oil ignition system of the gas turbine engine shown in the illustrationNot learned 49. What is the purpose of the spring in a lip-type oil seal?Not learned 50. For the gas turbine engine lube oil system shown in the illustration, what is the purpose of the lube oil supply check valvesNot learned 51. The lube oil scavenge pressure on the gas turbine engine shown in the illustration is sensed by which of the followingNot learned 52. A gas turbine engine's main lube oil system pump check valve serves to maintain system prime and perform what other function?Not learned 53. How is the lube oil supplied to each bearing in a gas turbine engine controlled?Not learned 54. The main lubrication system utilized by the gas turbine engine shown in the illustration is what typeNot learned 55. What is the primary function of the main fuel control on the GE LM2500 gas turbine engine?Not learned 56. Wrenches that are recommended for use on gas turbine engines should be plated with which of the following elements?Not learned 57. Which of the following instruments is designed to help you when performing an internal inspection of the gas turbine engine?Not learned 58. 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 59. Routine water washing of the gas turbine compressor shown in the illustration, is usually performed while operating under which of the following conditionsNot learned 60. When conducting a borescope inspection of the compressor, why can airfoil and tip cracks be difficult to detect?Not learned 61. A variable capacity, pressure atomizing, fuel oil burner functions to __________.Not learned 62. When preparing to light off a cold boiler equipped with a return flow fuel oil system, the recirculating valve directs the flow of oil __________.Not learned 63. Which of the following statements describes how the fuel oil enters the whirling chambers of the sprayer plates used in an auxiliary boiler return flow fuel oil system?Not learned 64. Which type of feed water regulator listed provides the MOST effective regulation of boiler water level under all operating conditions?Not learned 65. A two-element boiler feedwater regulator is controlled by __________.Not learned 66. The two-element feedwater regulator functions similarly to the three-element feedwater regulator but does not utilize __________.Not learned 67. A single element boiler feedwater regulating system used aboard ship utilizes __________.Not learned 68. A major difference between the two-element and the three-element feedwater regulator control systems, is that a three-element system will additionally measure and incorporate the __________.Not learned 69. Auxiliary boilers are divided into several classifications, one of which is __________.Not learned 70. The purpose of the separating nozzle in the accumulator of a water-tube, coil-type, steam generator is to separate __________.Not learned 71. Large steam drums are not required in the design of a coil-type auxiliary water-tube boiler because __________.Not learned 72. Which of the following statements concerning fire-tube boilers is correct?Not learned 73. The rate of heat transfer in a water-tube auxiliary boiler can be increased by __________.Not learned 74. Downcomers installed on auxiliary package boilers are protected from direct contact with hot gases by __________.Not learned 75. The tube sheets installed in a fire-tube auxiliary boiler are normally connected by _________.Not learned 76. Fusible plugs are installed in fire-tube boilers to ________.Not learned 77. The purpose of try-cocks used on an auxiliary boiler is to __________.Not learned 78. 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 79. The primary function of a flame safeguard system, as used on an automatically fired auxiliary boiler, is to prevent what condition?Not learned 80. Which of the listed sequence of events occurs when an automatic auxiliary boiler is pre-purged?Not learned 81. The pressuretrol which is installed on an auxiliary boiler senses steam pressure changes and __________.Not learned 82. Which of the following actions takes place in the control circuit of an automatically fired auxiliary boiler when the desired steam pressure is obtained?Not learned 83. Accelerometers are generally used on gas turbine engines to sense which of the following?Not learned 84. The acronym CDP stands for which of the following?Not learned 85. The acronym FOD stands for which of the following?Not learned 86. The acronym GG represents which of the following?Not learned 87. The acronym MFC represents which of the following?Not learned 88. The acronym VSV represents which of the following?Not learned 89. While air is being compressed in a centrifugal flow gas turbine, what happens to the direction of air flow?Not learned 90. Air used to cool the combustion liners and turbine components is referred to as which of the following?Not learned 91. 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 92. An axial compressor basically consists of which of the following?Not learned 93. An axial compressor stage is represented by which of the following components and in which order?Not learned 94. The bleed air surge relief valve differs from a normal relief valve in which of the following ways?Not learned 95. The boiler shown in the illustration would be classed as __________Not learned 96. Borescope inspection of the combustor section requires which type of light source?Not learned 97. A centrifugal compressor assembly consists of which of the following?Not learned 98. 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 99. How is the clutch shown in the attached illustration engagedNot learned 100. Compressor characteristics are normally summarized in the form of which of the following?Not learned 101. What is a compressor midspan shroud?Not learned 102. 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 103. When a compressor is in a stall condition, what will happen to the combustor and turbine temperatures?Not learned 104. Compressor surge is caused by which of the following factors?Not learned 105. When conducting a borescope inspection, you must be aware of all of the following factors EXCEPT which?Not learned 106. Why is the cycle efficiency higher in the intercooled-recuperated cycle as compared to a simple cycle gas turbineNot learned 107. Displacement, velocity and acceleration describe three types of which of the following?Not learned 108. The electrostatic vent fog precipitator removes oil mist from which of the following areas?Not learned 109. To ensure minimum clearance between rotor blade tips and the casing of an axial compressor, manufacturers use which of the following techniques?Not learned 110. Which of the following could cause compressor stall?Not learned 111. Which of the following designs is the most satisfactory method for attaching turbine blades to the rotor disk?Not learned 112. Which of the following is a disadvantage of utilizing a gas turbine versus a diesel engine for propulsion?Not learned 113. Which of the following is NOT a gas turbine auto shutdown parameter?Not learned 114. Which of the following is the main advantage of a split-axial compressor case?Not learned 115. Which of the following are the principle factors that affect the performance of a gas turbine compressor?Not learned 116. Which of the following is the principle that a magnetic speed sensor/pickup operates on?Not learned 117. Which of the following statements correctly describes force?Not learned 118. Which of the following statements is true concerning axial compressor disk-type rotors?Not learned 119. Which of the following statements is true about the "lockout control" on a synchronous self-shifting (SSS) clutch?Not learned 120. Which of the following terms refers to thermal energy in transition?Not learned 121. Which of the following wrenches should NOT be used while working on a gas turbine?Not learned 122. The gas generating sections of marine gas turbine engines are based on which of the following?Not learned 123. In a gas turbine engine, the majority of the energy is added to the working fluid in which of the following components?Not learned 124. Gas turbine fuel manifold pressure is established by which of the following actions?Not learned 125. 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 126. 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 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. Kelvin is the absolute temperature scale that corresponds to which of the following?Not learned 130. The lube oil system shown in the illustration, consists of which of the following sub-systemsNot learned 131. A magnet pickup typically produces what type of signal output?Not learned 132. How do you manually lockout an SSS clutch?Not learned 133. Mechanical work is defined as which of the following?Not learned 134. What method is utilized to allow turbine nozzle blades to withstand high inlet temperatures?Not learned 135. An open cycle gas turbine engine is best described by which of the following statements?Not learned 136. 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 137. Potential energy is defined as which of the following?Not learned 138. Power is defined as which of the following?Not learned 139. What is the primary function of an axial compressor rotor blade?Not learned 140. Rotation of the controllable-pitch propeller (CPP) blades is achieved through axial movement of what component in the hub body assembly?Not learned 141. 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 142. As shown in the illustration, what is the purpose of pressurizing the main bearing lube oil sumps on a typical marine gas turbineNot learned 143. Under standard atmospheric conditions, 208.7 PSIG converts to approximately what in absolute pressure?Not learned 144. A temperature of 32.5 degrees Celsius converts to approximately what temperature in degrees Kelvin?Not learned 145. A temperature of 69.5 degrees Fahrenheit converts to approximately what temperature in degrees Rankine?Not learned 146. 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 147. What is the term given to a process that occurs without a loss or gain of heat?Not learned 148. What is the term used to describe the stationary vanes preceding the first stage of an axial compressor?Not learned 149. The thermal energy added to the gas as it flows through the combustion section has what effect on the gas?Not learned 150. 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 151. The three most common types of combustors used in gas turbine engines are which of the following?Not learned 152. Turbine disks are commonly attached to the shaft by which of the following methods?Not learned 153. The turbine nozzle blades convert the combustion gases heat and pressure energy into what form of energy?Not learned 154. The turbine nozzles convert heat and pressure energy to velocity energy by means of which of the following?Not learned 155. A turbine stage is represented by which of the following components and in which order?Not learned 156. Two functions of the compressor stator vanes include which of the following?Not learned 157. What are the two primary sources of deposits that build up on compressor blades?Not learned 158. What are the two principal functions of the turbine nozzle guide vanes?Not learned 159. What type of engine starter motor is commonly found on the marine gas turbine shown in the illustrationNot learned 160. Variable stator vanes give an axial gas turbine compressor which of the following capabilities?Not learned 161. Variable stator vanes give an axial gas turbine compressor which of the following capabilities?Not learned 162. A photoelectric cell installed in an automatically fired auxiliary boiler burner management system __________.Not learned 163. When operating with the auxiliary feed line, feed water flow is controlled __________.Not learned 164. For the GE LM2500 gas turbine engine shown in the illustration, the 13th stage bleed air is used for which of the followingNot learned