Q532 - Motor Plants II, USCG prep certification 2026

Progress: 24% (23/94)

Learning progress ?

1. Sacrificial zinc anodes are used on the saltwater side of diesel engine heat exchangers to __________.Not learned 2. At a given pressure, erosion of steam piping and machinery will be minimized by utilizing __________.Not learned 3. Diesel engine jacket water is used in the fresh water distillation process as the __________.Not learned 4. Before any work is done on a burner in an automatically fired auxiliary boiler, you should always __________.Not learned 5. Which type of energy conversion is associated with an operating steam boiler?Not learned 6. Assume that steam has formed in a boiler in which all of the steam stop valves are closed, and the water level is held constant. When there is an increase in the temperature of the steam and water in the boiler, which of the following effects will occur on the pressure and the specific volume of the steam?Not learned 7. The greatest resistance to heat transfer from the fireside to the waterside of a water-tube boiler takes place in the __________.Not learned 8. A variable capacity, pressure atomizing, fuel oil burner functions to __________.Not learned 9. 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 10. A naturally aspirated diesel engine at full throttle will have an intake manifold pressure __________.Not learned 11. Which of the air intake systems listed will result in the lowest specific fuel consumption?Not learned 12. Air scavenging of the cylinder shown in the illustration begins between figures __________Not learned 13. What may cause a diesel engine cylinder head to crack?Not learned 14. In an auxiliary diesel engine, one reason for knurling the piston skirt is to __________.Not learned 15. After a long period of operation, a wear ridge, caused by piston ring action, will develop near the top of the cylinder liner. This ridge must be removed during maintenance in order to prevent __________.Not learned 16. The service life of a worn aluminum piston for an auxiliary diesel, for which no spares are readily available, can be extended by __________.Not learned 17. When a piston is removed from a diesel engine for maintenance, the piston should be examined for __________.Not learned 18. Excessive side clearance between a piston ring and its groove will cause the ring to __________.Not learned 19. If the compression rings on a diesel engine piston become stuck in the ring groove, the cause may be due to __________.Not learned 20. The closing of the exhaust valves used on a modern, large, low-speed, main propulsion diesel engine may be directly provided by __________.Not learned 21. Decreasing the exhaust valve clearance of a diesel engine will cause the exhaust valve to open __________.Not learned 22. Load control on a diesel engine is accomplished by __________.Not learned 23. The device used to limit engine torque at various engine speeds is called a __________.Not learned 24. Sensitivity for a diesel engine governor is described as the __________.Not learned 25. The principal characteristic of an isochronous governor is it will __________.Not learned 26. The direct acting mechanical governor used with some small diesel engines, controls fuel flow to the engine by __________.Not learned 27. In a simple hydraulic governor with speed droop, oil under pressure is maintained ready for use in the __________.Not learned 28. Diesel engines driving alternators operating in parallel must maintain a set frequency regardless of load changes. The governor characteristic used to accomplish this is known as __________.Not learned 29. In the illustrated auxiliary diesel engine governor, decreasing the distance between piece 6 and piece 10 will affect the engine by __________Not learned 30. Adjustments to the compensating needle valve in a hydraulic governor should be made with the engine at __________.Not learned 31. If a hydraulic governor has been refilled with oil, the engine should be operated until it reaches normal temperature, then the air should be purged, and the __________.Not learned 32. If the speeder spring of a main propulsion diesel engine governor breaks while operating at full load, the engine RPM will _________.Not learned 33. A diesel-generator governor is hunting. After changing the oil, the governor is flushed and the compensation needle valve is adjusted, but the hunting persists. You should NOW __________.Not learned 34. The overspeed trip installed on most diesel engines will stop the engine by shutting off the __________.Not learned 35. The overspeeding of the diesel engine driving an electric generator could cause __________.Not learned 36. A diesel engine overspeeds and fails to restart when cranked at normal speed. Which of the following problems is the most likely cause for the engine failing to restart?Not learned 37. A main propulsion diesel engine is normally shutdown by __________.Not learned 38. Diesel engine control can be obtained by the bridge __________.Not learned 39. Diesel engine automated control systems may utilize sensing devices of dual function, with sensing ranges providing both alarm and engine shut down capability. Which of the key points listed would only require an alarm sensor?Not learned 40. When running a large, dual fuel, main propulsion diesel engine on heavy fuel, which of the following precautions should be observed when switching from heavy fuel oil to diesel oil?Not learned 41. Air is normally bled from a diesel engine fuel system by __________.Not learned 42. An immediate repair is required if a leak occurs in the high-pressure fuel piping between the injection pump and fuel nozzle because of the __________.Not learned 43. Fuel injectors used in heavy fuel oil systems are usually provided with cooling to reduce __________.Not learned 44. If the coolant temperature is too low as it passes through internally cooled fuel injectors, the injectors can be damaged by __________.Not learned 45. When a nozzle tester is being used to test a "closed" type fuel injection nozzle, a clogged nozzle orifice will be indicated by a __________.Not learned 46. Which of the fuel nozzles listed requires the LEAST maintenance?Not learned 47. The spray holes in diesel engine fuel valves should be cleaned using carbon solvent and __________.Not learned 48. The principal hazard to personnel when using a diesel engine fuel nozzle tester is _______.Not learned 49. When a nozzle tester is used to check the spray pattern of a diesel fuel injection nozzle, which of the following statements is true?Not learned 50. Surface irregularities, such as erosion and pitting on injection pump plungers, will __________.Not learned 51. Because of the close tolerances used in diesel engine fuel oil pumps, a worn plunger requires __________.Not learned 52. High cylinder firing pressure, accompanied by low exhaust temperature, can result from __________.Not learned 53. What could cause the bypass valve in a full flow lubrication system to open?Not learned 54. When cleaning a duplex strainer, it is important for __________.Not learned 55. When tightening the lock ring "G" of the device shown in the illustration, two events are simultaneously accomplished. Which of the following statements represents these eventsNot learned 56. Item labeled "R" as shown in Fig. 5 of the illustration is identified as the __________Not learned 57. Cooling water pumps driven by direct-reversing diesel engines are usually __________.Not learned 58. What would be considered a normal temperature increase between the inlet and outlet jacket cooling water of a medium or high-speed diesel engine operating at normal load?Not learned 59. Which operating parameter may need to be decreased when running a large main propulsion diesel engine at low load conditions?Not learned 60. Using a cooling water temperature of 225°F (107.2°C), instead of 180°F (82.2°C), in an auxiliary diesel engine will __________.Not learned 61. In a diesel engine closed freshwater cooling system, the cooling water pressure drop through the engine is 10 psig, and the pressure drop through the heat exchanger is 4 psig at maximum flow rates. The cooling water pump must produce a discharge head of at least __________.Not learned 62. In a diesel engine jacket water cooler, with sea water cooling the fresh water, the __________.Not learned 63. In a diesel engine closed freshwater cooling system employing a radiator, proper water temperature can be obtained by __________.Not learned 64. The operation of the lube oil cooler, shown in the illustration as item No.4, will be characterized by which of the following statementsNot learned 65. If the jacket water temperature rises rapidly above normal in a diesel engine, you should FIRST __________.Not learned 66. A large, low-speed, main propulsion diesel engine uses sea water to directly cool the __________.Not learned 67. Antifreeze solutions containing ethylene glycol should not be mixed with corrosion protection oils, as the resultant mixture __________.Not learned 68. The outlet from an expansion tank of a closed fresh water cooling system should be piped to the __________.Not learned 69. The temperature at which an adjustable bellows type thermostatic valve operates is determined by __________.Not learned 70. In a naturally aspirated diesel engine, the volume of air intake is directly associated with engine __________.Not learned 71. In a naturally aspirated diesel engine, the volumetric efficiency of the intake air charge is mainly influenced by the __________.Not learned 72. An increase in the air inlet manifold pressure of a diesel engine will result in a/an __________.Not learned 73. Compared to a naturally aspirated diesel engine, a supercharged diesel engine has _________.Not learned 74. Cooling the intake air supplied to a diesel engine will __________.Not learned 75. The power consumed during the scavenging process of a diesel engine is known as the _______.Not learned 76. The process of scavenging a two-stroke cycle diesel engine serves to __________.Not learned 77. Clearance volume scavenging in a turbocharged, four-stroke cycle diesel engine is accomplished __________.Not learned 78. In a Roots-type rotary blower, the volume of air delivered is directly proportional to __________.Not learned 79. Which of the designs listed will keep the lobes from making contact in a Roots-type blower?Not learned 80. In a two-stroke cycle diesel engine, a Roots-type blower is usually __________.Not learned 81. When the timing gear backlash for a Roots-type blower has become excessive, the problem is properly repaired by __________.Not learned 82. Why will a turbocharged diesel engine produce black smoke if excessive additional load is applied too quickly?Not learned 83. Large, two-stroke/cycle, main propulsion, diesel engine cylinders can be successfully pressure charged during normal operation by using the __________.Not learned 84. Which of the turbocharging systems listed operates with the least average back pressure in the exhaust manifold?Not learned 85. Which of the turbocharging methods listed directs the exhaust gases to the turbine at fairly uniform velocity and pressure?Not learned 86. During the valve overlap period, the exhaust pressure of a turbo-charged, four-stroke cycle diesel engine must be less than the intake manifold pressure to ensure __________.Not learned 87. In a turbocharger, inlet air velocity is increased in the __________.Not learned 88. When would the available energy of the exhaust gases of a two-stroke cycle diesel engine be insufficient to drive an exhaust gas turbocharger, resulting in the incorrect amount of air for combustion?Not learned 89. Which of the following statements is correct regarding a turbocharged four-stroke cycle diesel- generator?Not learned 90. Which of the following precautions should be taken when cleaning the air filter on a diesel engine equipped with a turbocharger?Not learned 91. What is the function of the after coolers installed in the diesel engine air intake system?Not learned 92. Aftercooling of a turbocharged diesel engine will result in _________.Not learned 93. The power output of a turbo-charged diesel engine will drop if the cooling water flow through the after cooler is interrupted because the __________.Not learned 94. Diesel engine exhaust gas temperatures can be used to determine individual cylinder __________.Not learned 95. A water jacket is placed around the exhaust manifolds of propulsion diesel engines to __________.Not learned 96. Oil accumulating in the exhaust piping or manifold of a diesel engine can be caused by __________.Not learned 97. In a diesel engine exhaust system, the cooling of the exhaust gases below their dew point, will result in __________.Not learned 98. One of the factors limiting the amount of load which can be put on a modern marine diesel engine is the __________.Not learned 99. The average exhaust temperature of a two-stroke cycle diesel engine with a turbine-driven supercharger is lower than a similar four-stroke cycle diesel engine at equal loads because __________.Not learned 100. Exhaust pipes for separate main propulsion diesel engines can be combined only when __________.Not learned 101. The exhaust system for a turbocharged diesel engine functions to ________.Not learned 102. Which of the diesel engine exhaust mufflers listed is usually equipped with a spark arrestor?Not learned 103. Marine diesel engine dry-type mufflers reduce noise by __________.Not learned 104. Wet-type exhaust silencers, that are used with some lifeboat diesel engines, utilize which design feature?Not learned 105. Casing drains may be required on a waste heat boiler gas passage side to __________.Not learned 106. A waste heat boiler is installed on some diesel propelled vessels to __________.Not learned 107. The purpose of the separating nozzle in the accumulator of a water-tube, coil-type, steam generator is to separate __________.Not learned 108. Large steam drums are not required in the design of a coil-type auxiliary water-tube boiler because __________.Not learned 109. Which of the following statements concerning fire-tube boilers is correct?Not learned 110. The rate of heat transfer in a water-tube auxiliary boiler can be increased by __________.Not learned 111. In an auxiliary boiler steam and water system, the highest pressure will be in the __________.Not learned 112. Downcomers installed on auxiliary package boilers are protected from direct contact with hot gases by __________.Not learned 113. Fusible plugs are installed in fire-tube boilers to ________.Not learned 114. Excessive vibration from an auxiliary boiler could be caused by __________.Not learned 115. If a tube ruptures in a water-tube auxiliary boiler due to low water, you should ___________.Not learned 116. 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 117. The concentration of total dissolved solids in the water of an auxiliary boiler can increase as a result of __________.Not learned 118. The correct procedure for giving an auxiliary boiler a bottom blow, is to begin __________.Not learned 119. The water in an auxiliary boiler should be tested for chloride content to determine __________.Not learned 120. When checking for the presence of sulfite in the feed water of an auxiliary boiler, you are in essence checking __________.Not learned 121. The most common cause of scale formation in an auxiliary boiler is __________.Not learned 122. Excessive alkalinity of the water in an auxiliary boiler can cause __________.Not learned 123. High stack temperature occurring in an auxiliary boiler could be a result of __________.Not learned 124. Which of the following conditions could cause the feed pump for an auxiliary boiler to lose suction?Not learned 125. 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 126. 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 127. The pressuretrol which is installed on an auxiliary boiler senses steam pressure changes and __________.Not learned 128. 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 129. Which of the automatic boiler controls listed should be tested prior to lighting off an auxiliary boiler?Not learned 130. Direct reversible main propulsion diesel engines would normally be fitted with a/an __________.Not learned 131. Which of the types of reduction gearing listed is best suited for medium-speed main propulsion units?Not learned 132. Reduction gear casings are vented in order to __________.Not learned 133. A diesel engine with a full speed of 1000 RPM drives a propeller at 300 RPM. What is the speed reduction ratio?Not learned 134. One advantage of electromagnetic slip couplings is __________.Not learned 135. When an additional load is applied to a diesel engine which is using an inadequately inflated air bladder clutch unit, you can expect __________.Not learned 136. A diesel engine may fail to start when being cranked, due to __________.Not learned 137. Which of the listed items should be secured before performing any maintenance on a solenoid operated air start valve?Not learned 138. Which of the listed conditions could result in the failure of an auxiliary diesel engine to stop running when a normal shutdown is attempted?Not learned 139. An auxiliary diesel-generator continues to run after you try to shut down. Your next course of action should be to _________.Not learned 140. What is the best way of stopping an overspeeding diesel engine?Not learned 141. The most common instrument used to measure diesel engine exhaust pressure is the __________.Not learned 142. The boiler shown in the illustration would be classed as __________Not learned 143. As shown in the illustration, the component labeled "N" would be identified as a ________Not learned 144. Which device is used to prevent over pressurization of the illustrated distillerNot learned 145. Excess brine accumulated in the distiller, shown in the illustration, is removed during normal operation by __________Not learned 146. Which of the following statements describes the approximate relation between the feedwater entering the unit shown in the illustration and brine being removedNot learned 147. Which of the following statements describes what will occur to the volume of water vapor as it is exposed to the lower temperatures existing in the device labeled "24" shown in the illustrationNot learned 148. Which of the following statements represents the two major functions provided by the item labeled "20" shown in the illustrationNot learned 149. What is the function of the item "7" shown in the illustrationNot learned 150. Item "10" shown in the illustration is used to __________Not learned 151. Where is the latent heat obtained to create vapor from the feed water in the illustrated distillerNot learned 152. During operation which device listed removes air and non-condensable gases from the unit shown in the illustrationNot learned 153. Which of the valve arrangements listed would be correct for operating the distillation plant shown in the illustrationNot learned 154. The 3-position, 4-way directional control valve with a 30 bar output at "ee" as shown in the illustration (MO-0116) is a blocking valve associated with the engine turning gear. Which of the following statements describes its function when incorporated into a slow-speed diesel engine starting control air distributor as shown in the illustration (MO-0053)Not learned 155. A main propulsion diesel engine on your ship docking tug has experienced a safety shutdown due to high lubricating oil temperature. What is the appropriate response?Not learned 156. The auxiliary oil-fired fire-tube steam boiler fitted on your towing vessel is equipped with a water level electrode assembly similar to that shown in the illustration. Under normal circumstances, what would be considered a normal operating water level (NOWL)Not learned 157. The auxiliary oil-fired water-tube steam boiler on your ship-docking tug is equipped with a water column similar to that shown in the illustration. Assuming that the water level is at the normal operating water level (NOWL) of the boiler, what would be the result of alternately opening and reclosing each of the water column tri-cocksNot learned 158. The auxiliary steam boiler on your vessel is equipped with a gauge glass for local level indication. On which of the following auxiliary boiler types would this gauge glass be attached to a flash chamber also known as a steam accumulator or steam separator?Not learned 159. Clutching takes place nearest the bearing shown in the illustration, located at number _____Not learned 160. The most common contaminate of governor hydraulic fluid is __________.Not learned 161. For corrosion to take place within the closed, recirculating cooling water system of a marine diesel engine, an electro-chemical cell must exist where the cooling water is electrically conductive. Which of the following factors has the greatest influence on electrical conductivity?Not learned 162. Device "27" shown in the illustration is used to __________Not learned 163. The device represented by the symbol "B" in the illustration is used to __________Not learned 164. Diesel engine closed, recirculating cooling water systems are particularly prone to cavitation corrosion/erosion. Which of the listed cooling system/engine components has surfaces in contact with the coolant that are most susceptible to this type of corrosion and erosion?Not learned 165. Some diesel engines are fitted with a thermometer in the cooling water outlet from each cylinder. If the cooling water temperature from all cylinders begins to rise above normal, you should suspect __________.Not learned 166. The diesel engine shown in the illustration can be fitted with a pyrometer at each exhaust elbow. If one of the cylinder pyrometers is reading significantly higher than the others, which of the following should be your FIRST actionNot learned 167. The diesel engine shown in the illustration, which of the lettered parts listed is cooled by sea waterNot learned 168. The diesel engine shown in the illustration is provided with an auxiliary blower to __________Not learned 169. If a diesel engine has been stopped because of piston seizure due to severe overheating, the crankcase __________.Not learned 170. What effect does nitrogen, as a volumetric component of a diesel engine's cylinder air charge, have on the ignition and combustion?Not learned 171. In the engine shown in the illustration, the part labeled "W" is cooled by __________Not learned 172. Ethylene glycol, when used as a coolant in a closed cooling system for a diesel engine, is more advantageous than untreated raw water because it __________.Not learned 173. Excessive wear at part No.11, shown in the illustration would result in __________Not learned 174. Excluding line losses, how many distinct pressure drops will occur as sea water flows through all the heat exchangers in the cooling system shown in the illustrationNot learned 175. The expansion tank for a diesel engine closed cooling system is designed to maintain a constant head on the system and __________.Not learned 176. Which of the following actions takes place in the control circuit of a semi-automatic (manual ignition) fired auxiliary boiler when the desired steam pressure is obtained?Not learned 177. On which of the following auxiliary boiler types would soot blowers be equipped for maintaining heat transfer efficiency?Not learned 178. Which of the following conditions best describes the reason for performing a bottom blow on an auxiliary steam boiler?Not learned 179. After following the prescribed procedures to measure the thrust bearing clearance shown in the illustration, the distance "F" is determined to be 200 mm, and 'f1' is 2.3 mm. Which of the following statements describes the condition indicated by these dimensionsNot learned 180. Which of the following statements is correct concerning the operating function of the governor shown in the illustrationNot learned 181. Which of the following statements describes the operation of the circuit shown in the illustrationNot learned 182. Which of the following statements describes pertinent criteria for performing a surface blow for the purposes of removing excess chemicals and/or salinity as indicated by boiler water testing on an auxiliary steam boiler as fitted on your vessel?Not learned 183. What is the function of the device labeled "3" shown in the illustrationNot learned 184. The function of the synchronizing motor on the generator governor illustrated is to __________Not learned 185. The gear drive, shown in the illustration, can have the backlash determined best by using a __________Not learned 186. As a general rule, what would be the recommended operating water jacket outlet temperature range for medium-speed marine diesels setup with closed treated fresh water cooling systems and fitted with vented expansion tanks?Not learned 187. The governor, shown in the illustration, will have its preset speed droop altered whenever __________Not learned 188. The governor utilized with the device shown in the illustration has become inoperative while the vessel is underway at sea. Which of the following statements describes what action should be takenNot learned 189. The graphic dotted line between items "27", "12", "9", and "20", shown in the illustration, is used to indicate the use of __________Not learned 190. The hunting of a diesel engine may be caused by which of the following?Not learned 191. With an increase in the saturation pressure of a fluid, the value represented by line "5" on the graph will __________Not learned 192. When installing the bearing cap on the device shown in the illustration, which of the precautions listed must be observedNot learned 193. The instrument shown in the illustration would be used on a diesel engine to __________Not learned 194. The items labeled "21" and "22", shown in the illustration are used to remove __________Not learned 195. The large, slow-speed, main propulsion diesel engine shown in the illustration, the part labeled 'B' contains __________Not learned 196. Which of the listed characteristics is common to both wet and dry type diesel engine exhaust muffler systems?Not learned 197. As the load is being decreased on the engine controlled by the governor shown in the illustration, the __________Not learned 198. A loop-scavenged engine utilizes the motion of its pistons and a turbocharger to provide scavenging air. Which of the listed mechanical designs prevents the air under the pistons from being pumped back through the scavenge ports during the piston power stroke?Not learned 199. How is lubrication provided to the device shown in the illustrationNot learned 200. After a main diesel engine on your vessel has experienced a safety shutdown due to excessive crank-case pressure, why is it important to wait 2 hours before opening the crankcase to investigate the cause of the trip?Not learned 201. A main diesel engine on your platform supply vessel has experienced a safety shutdown due to excessive crankcase pressure. What is the appropriate response?Not learned 202. The main engines on your vessel are fitted with speed control governors based on the operating principle shown in the illustration. What statement is true concerning the illustrated pressure-compensated governorNot learned 203. A main engine speed control governor for one of your uninspected fishing industry vessel's main propulsion engines hunts, surges, or is sluggish to respond to load changes. Which of the following governor oil conditions would be the greatest single source of governor troubles?Not learned 204. The main engine thrust bearing shown in the illustration contains how many thrust shoesNot learned 205. What is the normal bearing clearance permitted at the horizontal axis of the shaft for the bearing shown in the illustrationNot learned 206. You are observing the flame condition on an oil-fired auxiliary boiler through an observation window peephole. The flame is a reddish color accompanied by a noticeably panting/pulsating furnace. What would be the correlating color of the gases exhausting from the stack under these conditions?Not learned 207. What occurs within the tubes of the device labeled "23" shown in the illustrationNot learned 208. The vessel to which you are assigned is fitted with a totally pneumatic propulsion control system as shown in the illustration. If propulsion control functions perfectly from the engine room control station, but will not function at all from any of the remote stations, which of the following system faults best accounts for these symptomsNot learned 209. The vessel to which you are assigned is gear-driven with one main propulsion diesel engine and a fixed-pitch propeller. While underway, the main engine becomes disabled, requiring your vessel to be towed back into port. If pressurized lubricating oil is not available to the reduction gear shaft bearings, what must be done during the towing operation?Not learned 210. On a vessel fitted with a coil-type, forced-circulation, water-tube, oil-fired auxiliary boiler, what is the most practical way of determining if the inside surface of the coil is excessively scaled with hard scale deposits?Not learned 211. The oil platform construction support vessel to which you are assigned has main diesel engines fitted with intake and exhaust systems as shown in the illustration. If the main engine is running under a heavy load at maximum rpm, which pressure would ordinarily be negativeNot learned 212. While operating the fuel oil centrifuge shown in the illustration, the bowl fails to open for sludge ejection. The probable cause is that __________Not learned 213. The pneumatic circuit shown in the illustration is part of a control system used with large low-speed diesel engines. The arrangement may be used to control __________Not learned 214. The pneumatic propulsion control system used on your anchor-handling supply vessel uses a diaphragm-operated relay valve as shown in the illustration. Periodically, the valve is to be disassembled for cleaning and inspection. What statement best describes the proper method for servicing the in-line strainersNot learned 215. The pneumatic propulsion control system used on your vessel uses a diaphragm-operated relay valve as shown in the illustration. Periodically, the valve is to be disassembled for cleaning and inspection. What statement best describes the proper techniqueNot learned 216. You are preparing to change the oil of the speed control governor on one of the main propulsion diesel engines on your vessel. What statement is true concerning the draining and flushing procedures?Not learned 217. While preparing an engine for departure, the engineer notices water coming from both the waste heat boiler and turbocharger drains. Which of the following could be the cause?Not learned 218. When preparing an engine for sea, the engineer notices water coming from both the turbo-charger exhaust casing drain and one cylinder indicator valve. Which of the following could be the possible cause?Not learned 219. What prevents the thrust bearing blocks shown in the illustration from rotating within the housingNot learned 220. What is the primary function of item '15' shown in the illustrationNot learned 221. While proceeding in open waters to a ship requiring docking assistance, one of the main engines on your ship-docking tug overheats. The high jacket water temperature alarm sounds, the freshwater thermometers indicate out of range (high), and the expansion tank level sight glass indicates out of range (high) with vapor bubbles forming and escaping through the vent. What is the appropriate initial response?Not learned 222. A propulsion engine, using the speed control circuit shown in the illustration, fails to function at speeds lower than the low end of the critical speed range. Which of the following statements describes what should be done to correct this malfunctionNot learned 223. With reference to the chart, if a boiler generates saturated steam at 385.3 psig, how much heat per pound was required to change the water into steam if the feedwater temperature was initially 220°FNot learned 224. Regarding the turbocharger shown in the illustration, the part labeled "B" would be attached to the __________Not learned 225. After removing the bowl hood of the device shown in the illustration, excessive quantities of sludge are visible. Which of the following statements represents the approach to rectify the situationNot learned 226. In the reversing reduction gear shown in the illustration, the forward and reverse main pinions are in constant mesh with the main gear. This means the __________Not learned 227. When rolling over a main engine on your vessel prior to starting with the cylinder test valves open to expel any fluids accumulated within the cylinders, a rather large amount of water is discharged. What is the appropriate response?Not learned 228. The vessel to which you are assigned has main engines fitted with intake and exhaust systems as shown in the illustration. Assume that the vacuum between the air filter and the turbocharger blower inlet is 12" of water column (negative with respect to atmospheric pressure) when the engine is running at 50% of maximum, continuous rated load. What will happen to the suction vacuum when the load is increased to 100% of maximum continuous rated loadNot learned 229. The section of the turbocharger which would be connected to the aftercooler inlet is labeled __________Not learned 230. Which set of valves will be opened intentionally to remove heat from the main engine jacket cooling water system shown in the illustrationNot learned 231. As shown in the illustration, the function of component "3" is to ________Not learned 232. As shown in the illustration, the function of the component labeled "G" would be to ________Not learned 233. As shown in the illustration, if the vessel was operating at full sea speed, the area labeled "L" would be used to ________Not learned 234. The starter control valve in the hydraulic system shown in the illustration is malfunctioning. Before removing the valve, you must first __________Not learned 235. Which statement most accurately represents the requirements for softening hard carbon deposits associated with the burner atomizers of an auxiliary boiler as fitted on your anchor-handling supply vessel?Not learned 236. You suspect that the diesel generator in service on your vessel has a low coolant level. Assuming that the cooling water system is pressurized and has no sight glass associated with the expansion tank, which of the following represents the proper procedure for checking the coolant level?Not learned 237. The thermostatic valve in the illustration is used for controlling the coolant temperature in a main propulsion diesel engine. Which of the following can be used to verify proper valve operation with the valve disassembledNot learned 238. A three-way thermostatic control valve regulates the diesel engine cooling water temperature by passing a portion of the water __________.Not learned 239. What type of bearing is shown in the illustrationNot learned 240. While underway on a slow-speed propulsion diesel, the duty engineer is alerted to a high scavenging air temperature at one cylinder. Which of the following could be a possible cause?Not learned 241. Using the oil chart provided in the illustration for guidance, which synthetic oil would be capable of providing adequate lubrication of the main engine speed control governor on your vessel, if the governor oil operating temperature shall be in the ideal operating range of 130°F to 205°FNot learned 242. When vapor is in contact with and remains at the same temperature as the boiling liquid from which it was generated, the vapor and liquid are said to be in which of the following?Not learned 243. The vessel to which you are assigned has diesel generators fitted with intake and exhaust systems as shown in the illustration. What statement is true concerning the valves (items #1 and #9)Not learned 244. If the water level as indicated by the gauge glass of an auxiliary boiler is in question, it should be blown down. Which of the following statements represents the proper procedure for performing a gauge glass blow down?Not learned 245. The water-tube natural-circulation steam boiler on your general-purpose supply vessel is equipped with soot blowers for maintaining heat transfer efficiency. Which of the following statements best describes the conditions that must be met before tubes can be safely blown using the soot blowers?Not learned 246. What would be the most practical and efficient way of removing hard scale deposits from the water-sides of the tubes of an auxiliary fire-tube boiler?Not learned 247. In a coil-type forced circulation water-tube boiler, __________.Not learned 248. Control of the fuel oil metering valve in an automatically fired boiler is accomplished by a __________.Not learned 249. According to the data given in illustration, which of the following would be the physical state of the fluid at a gauge vacuum of 28.09 inches Hg, and 117.99 degrees FahrenheitNot learned 250. Which of the following statements is correct concerning the operating function of the governor shown in the illustrationNot learned 251. As shown in the illustration, if the vessel was operating at full sea speed, the area labeled "A" would be used to ________Not learned