Q620 - Motor Plants, USCG prep certification 2026

Progress: 24% (23/94)

Learning progress ?

1. When any low-pressure distilling plant is operated with less than the designed vacuum, the __________.Not learned 2. Regarding the high-pressure pump of a reverse-osmosis freshwater generator, what statement is true?Not learned 3. You are analyzing the data used for trend analysis for one of the 2-stroke turbocharged main propulsion diesel engines on your ocean-going tug. Over time the scavenging air receiver (air box) pressure is steadily increasing. What condition would produce this data?Not learned 4. You are analyzing the data used for trend analysis for one of the main propulsion diesel engines on the OSV to which you are assigned. The cylinder exhaust temperature of one of the cylinders is significantly lower than the others. When analyzing compression and firing pressure data, however, the numbers are within the normal range for this particular cylinder. What condition would produce these results?Not learned 5. You are analyzing the data used for trend analysis for a two-stroke main propulsion diesel engine on your river push boat. Although the engine has yet to experience a safety shutdown on high crankcase pressure, over time the crankcase pressure (which normally runs in a vacuum) has gradually become less negative. Which of the following failures would most likely be responsible for this condition?Not learned 6. The anchor-handling supply boat to which you are assigned is fitted with a totally pneumatic propulsion control system as shown in the illustration. If the astern clutch fails to engage from the engine room control station, but engages properly from all remote-control stations, which of the following system faults best accounts for these symptomsNot learned 7. The anchor handling supply vessel to which you are assigned has diesel generator engines fitted with intake and exhaust systems as shown in the illustration. What type of turbo-charging configuration is usedNot learned 8. The river push boat to which you are assigned has diesel generators fitted with fuel injectors with the operating principle as shown in the illustration. In figure "B" which plunger rotation position corresponds to the engine running under no load at idle RPMNot learned 9. The river push boat to which you are assigned has diesel generators fitted with intake and exhaust systems as shown in the illustration. What does the component labeled "3" representNot learned 10. The anchor handling vessel to which you are assigned is fitted with generator drive engines of the type shown in the illustration. In terms of operating cycle and cylinder configuration, what statement is trueNot learned 11. The articulated tug-barge unit to which you are assigned has a pneumatic propulsion control system as shown in the illustration. What must be the position of the two transfer valves within the system when the mechanical slave remote control station is being used to control propulsionNot learned 12. You are assigned to a river push boat fitted with main propulsion diesel engines operating on the cycle represented in the polar timing diagram shown in the illustration. What combustion cycle event has a duration of 103°Not learned 13. You are assigned as an engineer on an uninspected fishing industry vessel using main propulsion engines of the type shown in the illustration. Assuming that the piston is properly positioned, what statement represents the procedure for inspection of the compression rings while in place inside the engineNot learned 14. You are on a river towboat using main propulsion engines of the type shown in the illustration. What statement represents the procedure for inspection of the lower cylinder liner bore while in place inside the engineNot learned 15. You are assigned to a platform supply vessel fitted with main propulsion diesel engines of the type shown in the illustration. If the engine's crankshaft is turning at 900 rpm, what will be the rotational speed of the two camshaftsNot learned 16. You are assigned to an OSV fitted with main propulsion diesel engines operating on the cycle represented in the polar timing diagram shown in the illustration. In consideration of the direction of rotation, what combustion cycle event occurs from point "A" to point "D"Not learned 17. You are assigned to a tractor tug with a drive system as shown in figure "A" of the illustration. What type of propulsion drive system is illustratedNot learned 18. Assuming the use of ultra low sulfur content diesel fuel, what combination of arrangements associated with river push boat main engine configurations would result in the most accelerated corrosion of the inside wall of an exhaust manifold of a main propulsion diesel engine?Not learned 19. Assuming the use of ultra-low sulfur content diesel fuel, what combination of conditions associated with harbor tug engine room operations would require the most frequent draining of exhaust systems of condensation?Not learned 20. You are attempting to start a deck winch drive engine fitted with an electric cranking motor where the battery electrolyte is frozen. What should be done to facilitate starting?Not learned 21. An auxiliary diesel engine on your towboat is equipped with an electric starting motor such as is shown in the illustration. For what reason is there a significant gap in distance between the start solenoid plunger (C) and the rod that is used to close the starter motor contactsNot learned 22. An auxiliary diesel engine on your fishing trawler uses a starting system similar to the one shown in the illustration. The hand pump is capable of charging the accumulator to the pressure necessary to start the engine and the engine successfully starts. While running, the engine driven pump is not capable of maintaining the accumulator in a state of being fully charged. Which of the following is most likely to be the causeNot learned 23. 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 24. The auxiliary engines on the offshore supply vessel to which you are assigned are fitted with Roots-blowers as shown in the illustration. What statement is true concerning the timing gears as shown in figure "A"Not learned 25. 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 26. The auxiliary oil-fired water-tube steam boiler on your anchor-handling supply vessel is equipped with a water column similar to that shown in the illustration. If the gauge glass becomes disabled or there is uncertainty associated with the gauge glass reading, the tricocks can be used to determine the boiler water level. What statement best describes the challenge associated with trying to differentiate between steam and waterNot learned 27. The auxiliary oil-fired water-tube steam boiler on your tug is equipped with a water column similar to that shown in the illustration. The most accurate way to determine the boiler water level is by alternately opening and reclosing the tri-cocks. At what point is the normal operating water level (NOWL) of the boilerNot learned 28. 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 29. An auxiliary plant on board a mobile offshore drilling unit that is invariably automated is the compressed air plant. Suppose the air compressors of such a plant are configured for lead-lag operation as shown in the illustration. If the sequence selector station is configured for #1 compressor to be the lead compressor and the #2 compressor to be the lag compressor, what statement is trueNot learned 30. You are about to check the valve lash adjustment on #1 cylinder's intake and exhaust valves of an auxiliary diesel engine fitted on the anchor-handling supply vessel to which you are assigned. You want to adjust the valve lash on both valves without having to reposition the crankshaft between adjustments. What should be the position of #1 piston to insure both the intake and exhaust valves are both in a position to facilitate valve adjustment?Not learned 31. When checking the crankcase oil level on an off-line diesel generator set engine on your offshore oil spill response vessel, what should be the oil level as indicated on the dipstick?Not learned 32. When checking the cylinder jacket water cooling expansion tank level on a main propulsion diesel engine on your towing vessel while underway on a coast-wise voyage, what should be the expansion tank level?Not learned 33. When checking the valve stem to rocker arm clearances on an auxiliary diesel engine onboard your OSV, which of the following statements concerning intake and exhaust clearances when taken cold is correct?Not learned 34. When cleaning burner atomizers associated with an oil-fired auxiliary boiler fitted on your fishery research vessel, which of the following metals would be recommended to use in fabricating a tool for the purposes of carbon removal?Not learned 35. In a closed, recirculating freshwater cooling system used for the diesel-generators on your offshore supply vessel, what function would chemical treatment with organic phosphates primarily perform?Not learned 36. In a closed, re-circulating freshwater cooling system used for the main engines on your sea-going salvage tug, what function would chemical treatment with nitrites primarily perform?Not learned 37. In a closed, recirculating freshwater cooling system used for the towing winch drive engine on your uninspected fishing seiner, what function would chemical treatment with pure ethylene glycol mixed with fresh water primarily perform?Not learned 38. In comparison to a naturally aspirated 4-stroke cycle engine, what characteristics are associated with turbocharging?Not learned 39. 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 40. While on deck, you are observing the stack of an oil-fired auxiliary boiler installed on your general-purpose supply vessel. The gases exiting the stack are a dense white smoke. Eliminating water vapor as a possible cause of the white smoke, what would be the correlating flame color as observed through an observation window peephole?Not learned 41. The deck winch drive engine onboard your salvage tug uses a lubricating oil filtration scheme as shown in the illustration. What type of filtration system is illustratedNot learned 42. The diesel engines on your anchor-handling supply vessel are all protected with dry-type air filters. When changing filter elements what visual indication would cause you to suspect that the engine has been contaminated with dust as the result of improperly sealing of the filter element gasket?Not learned 43. 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 44. A diesel engine driven winch on your towing vessel is fitted with a reversing reduction gear equipped with dry-type friction clutches. Which of the operational conditions listed below is most likely to result in clutch slippage and associated clutch disc wear?Not learned 45. The diesel engines on your general-purpose supply vessel are all protected with dry-type air filters. The air filters should be inspected and replaced in accordance with manufacturer instructions. What is the generally accepted criteria that would dictate when filter replacement becomes necessary?Not learned 46. In all diesel engines, including those used in offshore oil spill response vessels, at what point in the combustion cycle does ignition actually begin?Not learned 47. A diesel engine on your platform supply vessel has a restricted exhaust silencer/muffler resulting in high exhaust back pressure. With an appreciable load on the engine, what would be the condition of the exhaust gases exiting the stack?Not learned 48. The diesel fuels burned in auxiliary and main diesel engines of tugboats operating in harbor areas are required to meet certain specifications. Among these are limits of certain contaminants to limit atmospheric emissions to acceptable levels. Which of the following soluble contaminants is applicable?Not learned 49. The diesel generator engines onboard your mollusc dredger use a lubricating oil filtration scheme as shown in the illustration. What type of filtration system is illustratedNot learned 50. The diesel generator on service on your anchor-handling supply vessel is undergoing cyclic, rhythmic variations in speed at steady load. When the governor output shaft is disconnected from the fuel control linkage and the linkage is blocked manually, these variations in engine speed stop. What would be an appropriate corrective action?Not learned 51. The diesel generator set drive engines on your vessel are protected with heavy-duty oil bath air cleaners. The oil within these air cleaners should be periodically replaced in accordance with manufacturer recommendations. What statement best describes when it would be appropriate to deviate from the recommended frequency?Not learned 52. The diesel generator set engines on the towing vessel to which you are assigned are fitted with coalescing fuel filters, each fitted with a glass bowl. Assuming that the processed fuel is contaminated with solid impurities and entrained water, what would be the appearance of the bowl with the engine shutdown and no fuel flowing?Not learned 53. A diesel generator set on your salvage tug has a simplex lube oil strainer of the type shown in the illustration, situated on the discharge side of the lube oil pump. At a specified engine rpm and lube oil temperature, you notice that the pressure drop becomes unacceptably high. When you rotate the cleaning handle you notice that it is extremely difficult to rotate. What should be doneNot learned 54. A diesel generator set on your anchor-handling supply vessel has a simplex lube oil strainer of the type shown in the illustration, situated on the discharge side of the lube oil pump. At a specified engine rpm and lube oil temperature, you notice that the inlet pressure is increasing and the outlet pressure is decreasing, resulting in an unacceptable pressure drop. What should be doneNot learned 55. Due to environmental and safety concerns, the towing winch drive diesel engine cooling water system is treated with propylene glycol for protection against freezing. According to the illustration, what would be the limit of protection if 40 pints of propylene glycol are used in treating a cooling water system with a volumetric capacity of 10 gallonsNot learned 56. An engine that emits black smoke through the stack may indicate a misfiring cylinder. Assume that the auxiliary diesel engines on your fishing factory ship have a fuel injection system that permits the injectors to be disabled for troubleshooting purposes by loosening the high-pressure fuel injection line fitting at the injector nozzle while the engine is running and noting the response of the engine in terms emission of black smoke. Which of the following statements is true?Not learned 57. The engine manufacturer for the main engines used on your harbor tug specifies a supplemental coolant additive consisting of molybdate and nitrite be used to supplement the heavy-duty antifreeze for the closed, re-circulating freshwater cooling system. A test-strip comparison chart as shown in the illustration is used for coolant testing purposes. If the molybdate concentration color corresponds to row 2 and the nitrite concentration color corresponds to column B, what statement is trueNot learned 58. An engine that runs rough or expels large amounts of black smoke may indicate a misfiring cylinder. Assume that the auxiliary diesel engines on your vessel have a fuel injection system that permits the injectors to be disabled for troubleshooting purposes by loosening the high-pressure fuel injection line fitting at the injector nozzle while the engine is running and noting the engine response. If before the injector is disabled the engine is running rough and expelling large amounts of black smoke, and after the injector is disabled, the engine runs even rougher, but continues to produce equally dense black smoke, what is indicated?Not learned 59. The escort tug to which you are assigned is fitted with hydraulic clutches similar to that shown in the illustration. If the time required for the clutch to disengage is unacceptably long, which of the following conditions would most likely be responsible for thisNot learned 60. Exhaust system back pressure is customarily measured at the discharge of a turbocharger. If the exhaust system back pressure is higher than normal for a given engine load on your salvage tug at the point of measurement, which of the following conditions would most likely account for this?Not learned 61. The fire pump drive engine on the salvage tug to which you are assigned is fitted with a turbocharger as shown in the illustration. What statement is true concerning this type of turbochargerNot learned 62. The offshore supply vessel to which you are assigned has diesel generators fitted with fuel injectors of the type shown in figure "2" of the illustration. What statement is true concerning this type of injectorNot learned 63. The harbor tug to which you are assigned has a main engine fuel system as shown in the illustration. Besides preventing the attached fuel oil pump and the hand priming fuel oil pump from discharging through the other, what other purpose do the anti-flood check valves serveNot learned 64. Your platform supply vessel is fitted with cooling water systems serving the main propulsion diesel engines as shown in the illustration. Which heat exchanger/cooler application and aspect would most likely require periodic mechanical cleaning with a specially designed brushNot learned 65. The ship-docking tug to which you are assigned is fitted with auxiliary diesel engines of the type shown in the illustration. In terms of valve operating gear and cylinder liner type, what statement is trueNot learned 66. The oil platform supply vessel to which you are assigned is fitted with main propulsion engines driving through pneumatic airflex clutches as shown in the illustration. What statement is true concerning this type of clutchNot learned 67. The fishing industry line vessel to which you are assigned is fitted with main propulsion diesel engines of the type shown in the illustration. In terms of valve operating gear, cylinder liner type, and connecting rod type, what statement is trueNot learned 68. The salvage tug to which you are assigned is fitted with a totally pneumatic propulsion control system as shown in the illustration. If the astern clutch fails to engage from all control locations, but the ahead clutch properly engages from all control locations, which of the following system faults best accounts for these symptomsNot learned 69. Which offshore supply boat diesel fuel oil day tank condition would be most likely to result in water contaminated fuel?Not learned 70. Which of the following fuel systems is characterized by a complete absence of high pressure fuel lines?Not learned 71. The fresh water cooling system self-contained, internally-sensing thermostatic temperature control valves fitted on the main engines of your anchor-handling supply vessel are configured as shown in the illustration. If the valve sleeve (item #4) as controlled by the thermostatic sensing element (item #7) is in the position as shown in the drawing, what statement is trueNot learned 72. The freshwater cooling systems serving the main engines on your general-purpose supply vessel are arranged as shown in the illustration. If coolant drain valves are inadvertently opened during engine operation, what combination set of symptoms would most likely resultNot learned 73. The freshwater cooling systems serving the main engines of your offshore supply vessel are of the type shown in the illustration. What statement accurately describes the characteristics of the freshwater cooling circuitNot learned 74. The freshwater cooling systems serving the main engines on your fishery research vessel are arranged as shown in the illustration. If the fresh water thermostatic control valve fails in the position where 100% of the flow from flange "A" is permanently ported to flange "C" and flange "B" is permanently blocked, while starting and warming the engine with no load, what would be the resulting warm up time periodNot learned 75. The freshwater cooling systems serving the main engines on your supply boat are arranged as shown in the illustration. What statement best describes the functioning of the fresh water thermostatic control valve shown in the system diagramNot learned 76. The freshwater cooling systems serving the main engines of the platform supply vessel to which you are assigned are arranged as shown in the illustration. What statement best describes the arrangement of the freshwater keel cooler shown in the system diagramNot learned 77. The generator drive diesel engines on your supply boat are fitted with a multi-plunger injection pump with high pressure fuel lines leading to each hydraulically operated injector. If the engine is allowed to run out of fuel, it may become necessary to purge the high-pressure fuel lines of air. How is this accomplished?Not learned 78. The generator drive engines fitted on your articulated tug-barge unit are started by the type of starter shown in figure "B" of the illustration. What is the purpose of the gear train situated between the air turbine rotor shaft and the pinion shaftNot learned 79. The generator drive engines fitted on your harbor tug are started by the type of starter shown in figure "A" of the illustration. What type of starter is shownNot learned 80. The harbor tug to which you are assigned has diesel generators fitted with injectors with the operating principle as shown in the illustration. What statement is true concerning the metering principle used in this systemNot learned 81. The harbor tug to which you are assigned is fitted with 4-stroke cycle, 6-cylinder in-line diesel generator sets. Using the chart shown in the illustration, what is the firing order of the enginesNot learned 82. The OSV to which you are assigned is fitted with a totally pneumatic propulsion control system as shown in the illustration. All propulsion controls function properly from all locations with the exception of the pneumatic remote control station. Here the propulsion engine will run only at idle and neither propulsion clutch will engage regardless of the throttle lever control position. Which of the following system faults best accounts for these symptomsNot learned 83. The harbor tug to which you are assigned has main engines fitted with open type combustion chambers featuring direct injection. Of the listed figures below found in the illustration, which figure represents the most likely type of injector nozzle typeNot learned 84. The harbor tug to which you are assigned has main propulsion engines of the type shown in the illustration. In terms of operating cycle, scavenging flow pattern, and piston type, what statement is true concerning this engine typeNot learned 85. You are inspecting the blower of a Roots-blown, two-stroke cycle main propulsion engine on the ocean-going tug to which you are assigned and discover the presence of aluminum dust on the rotors and on the air duct surfaces. What would most likely be the direct cause of this?Not learned 86. When interpreting the engine lube oil supply header pressures for the main engines on your OSV, what statement is true assuming that the lube oil pump is engine-driven?Not learned 87. The lubricating oil system supporting the main propulsion reduction gear on the fishing trawler to which you are assigned is fitted with a sea water cooled 4-pass shell and tube lube oil cooler. The water box sacrificial zinc anodes must be inspected periodically. Which of the following listed actions correctly states maintenance criteria pertaining to scale build-up on the zincs?Not learned 88. The lubricating oil system supporting the main propulsion reduction gear on the ship-docking tug to which you are assigned is fitted with a lube oil strainer as shown in the illustration. What strainer attribute will dictate the degree of filtration in terms of the particle size capable of being filteredNot learned 89. The main diesel engines on your general-purpose supply vessel are protected with an array of devices designed to provide an alarm or possible shutdown for various unsafe conditions. During the maintenance procedure for adjusting the alarm and/or trip point setting for such a device, which of the following devices would have a time delay associated with it?Not learned 90. 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 91. The main engines on the anchor-handling supply boat to which you are assigned are fitted with duplex secondary spin-on fuel filters. Concerning the selector handle, what statement is true?Not learned 92. The main engines on your anchor handling supply vessel are equipped with manual shutdown levers as shown in the illustration. What statement concerning manual shutdown is trueNot learned 93. The main engines on your uninspected fishing trawler are equipped with over speed trip devices as shown in the illustration. What statement concerning the operation of the over speed trip is trueNot learned 94. The main engines on your fishing industry factory ship are fitted with speed control governors of the type shown in the illustration. What is the purpose of the compensation system, consisting of the buffer cylinder, buffer piston, buffer springs, and compensation needle valveNot learned 95. A main engine on your fishing trawler has experienced a low coolant water level alarm even though the water level in the expansion tank is normal. Assuming that the float activated switch is designed to open at low coolant level to activate the alarm, which of the following would account for this?Not learned 96. The main engines on your harbor tug are equipped with over speed trip devices as shown in the illustration. By what method is the engine shutdown on an over speed conditionNot learned 97. The main engines on your harbor tug are protected with a low crankcase oil level detector protective device designed to provide an alarm when the main sump oil level drops below a certain level. It is malfunctioning, and upon investigation you determine from the technical manual that the oil level detector is a sealed unit. What statement best represents the best strategy to remedy this situation?Not learned 98. The main engines on your harbor tug utilize a starting system with two air-start motors similar to that shown in the illustration. Upon pushing the start button, the solenoid air valve energizes open, but the air start relay valve fails to receive pilot air, and thus the starter motors and engine fail to rotate. Which of the listed conditions would most likely be the cause of the failure to startNot learned 99. The main engines on your river towboat are fitted with speed control governors of the type shown in the illustration. What technology is used to transmit the desired speed setting from the navigational bridge to the final input signal to the engine governorNot learned 100. The main lube oil header pressures for the main engines on your harbor tug are adversely affected by both excessive bearing wear and excessive diesel fuel dilution. What statement is true concerning these adverse effects?Not learned 101. The main propulsion diesel engines on your anchor-handling supply vessel are fitted with conventional hydraulically operated injector nozzles of the orifice type. When testing an injector by performing a pop-test on an injector test stand, you observe no leakage prior to reaching the popping pressure, the pressure holds at just below the popping pressure, the actual popping pressure is within specification, but the spray pattern is distorted. What maintenance is required?Not learned 102. The main propulsion diesel engines on the fishery research vessel to which you are assigned are fitted with mechanically operated and controlled unit injectors. When are the sintered metal supply and return injector filters typically replaced?Not learned 103. Various diesel engines onboard your offshore supply vessel are started by means of either vane-type or air- turbine air-starting motors. At a minimum, in the absence of automatic drain valves, how often should moisture separators be drained of moisture while the vessel is underway?Not learned 104. A main propulsion diesel engine on your towing vessel produces gray to black smoke under virtually all load conditions as observed at the stack. The heavier the load on the engine, the darker the smoke becomes. What condition would most likely account for this?Not learned 105. The main propulsion diesel engines fitted on your salvage tug are started with compressed air using the system illustrated. What is the starting method used with this systemNot learned 106. The main propulsion diesel engines fitted on your river push boat are of the type shown in the illustration. What type of starting system do engines of this type usually employNot learned 107. The main propulsion diesel engines fitted on your anchor handling vessel are equipped with engine crankcase oil level dipsticks marked on both sides of the dipstick. What is the significance of the markings?Not learned 108. The main propulsion diesel engines on your uninspected fishing industry vessel are fitted with mechanically operated and controlled unit injectors. In order for the engine to run properly, the injectors must be properly timed relative to the camshaft and properly synchronized relative to the other injectors. In terms of timing and synchronization, what statement is true?Not learned 109. The main propulsion diesel engines used to power the ship-docking tug to which you are assigned are started with vane-type air-starting motors designed to operate at 250 psig. The in-line lubricator should provide 3 drops of oil per cranking minute, as long as the in-line lubricator oil viscosity is as specified. If the start air pressure is within the normal range and the oil viscosity is correct, but the oil injection rate is only 1 drop per minute, what should be done?Not learned 110. The main propulsion engines onboard your harbor tug use a lubricating oil system as shown in the illustration. What item number represents the scavenging lube oil pumpNot learned 111. The main propulsion engines onboard your tractor tug use a lubricating oil system as shown in the illustration. What item number represents the lubricating oil filterNot learned 112. The main propulsion main engines on the ship-docking tug to which you are assigned are fitted with turbochargers as shown in the illustration. What statement is true concerning the over-running clutch and gear-drive train as fitted to this turbocharger typeNot learned 113. A main propulsion reversing reduction gear unit on your river pushboat is fitted with wet-type duplex multiple-plate type clutches. When in the neutral position, the output shaft continues to turn. Which of the following listed conditions would most likely be responsible for this?Not learned 114. What maintenance practice represents the best protection against moisture carryover to the fuel injection system of the main engines on board your general-purpose supply vessel?Not learned 115. The manufacturer of the diesel generator set drive engines used aboard your ship-docking tug recommends that no more than a 2 psig pressure drop across a fuel primary metal-edge suction strainer be allowed before recommended servicing. Assuming that the strainer inlet pressure is 4 psig, what would be the minimum allowable outlet pressure before recommended servicing?Not learned 116. The mollusc dredger to which you are assigned has a deck winch drive engine fitted with fuel injectors with the operating principle as shown in the illustration. In figure "A" which plunger travel position corresponds to when fuel injection beginsNot learned 117. The offshore supply vessel to which you are assigned is fitted with generator set drive engines as shown in the illustration. What statement is true in terms of the combustion chamber designNot learned 118. The mollusc dredger to which you are assigned has a pneumatic propulsion control system as shown in the illustration. What statement is true concerning transfer of controlNot learned 119. The multi-purpose offshore supply vessel to which you are assigned is fitted with main propulsion diesel engines of the type shown in the illustration. In terms of valve operating gear, cylinder liner type, and connecting rod type, what statement is trueNot learned 120. The multi-purpose supply vessel to which you are assigned is fitted with main propulsion reduction gears as shown in the illustration. What statement is true concerning this type of reduction gearNot learned 121. The ship-docking tug to which you are assigned has main engines fitted with injectors similar to those shown in the illustration. What statement is true concerning the operating principle of this type of injectorNot learned 122. 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 123. The vessel to which you are assigned is fitted with auxiliary engines as shown in the illustration. What statement is true concerning the valve guide and valve seat arrangementsNot learned 124. What statement concerning fuel cetane rating and the ignition delay period is true as it applies to towboat main propulsion diesel engines?Not learned 125. 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 126. 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 127. An oil bath type air cleaner, as the name implies, requires oil for effective air filtration. What statement is true concerning the oil bath air cleaners used to protect the auxiliary diesel engines on your tug?Not learned 128. The oil of a speed control governor on one of your tug's main diesel engines is foaming excessively, and internally governor parts are sticking due to corrosion. What is the most likely cause?Not learned 129. The oil spill response vessel to which you are assigned has diesel generators fitted with multi-plunger pumps with the metering principle as shown in the illustration. What statement is true concerning this injection pump typeNot learned 130. In order to determine the restriction across a dry-type air filter on one of the diesel engines on your ship- docking tug, the engine should be operating at rated speed and load. What instrument would give the most accurate measurement of air filter element restriction?Not learned 131. The pneumatic propulsion control system used on your towing vessel is configured as shown in the illustration. In terms of clutch air system maintenance, what statement best represents operational requirementsNot learned 132. 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 133. 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 134. In preparation for getting a tug-barge unit underway, if enough time has elapsed since the last main engine shutdown, it may be necessary to blow down the engine's cylinders to expel any accumulated water or oil. What statement concerning cylinder blow down is true?Not learned 135. 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 136. When preparing to change the oil of the speed control governor of one of the main propulsion engines on your towboat, you should consult the governor instruction manual to determine the proper viscosity of the oil to use. What is the primary factor that will determine the recommended viscosity?Not learned 137. Prior to starting an auxiliary diesel engine on your vessel, the crankcase oil level must be checked. At what checked level would you be required to add make-up oil?Not learned 138. Prior to starting a main propulsion diesel engine fitted on your multi-purpose offshore supply vessel, it has been determined that the transfer of make-up oil is required. At what checked level should you stop adding make-up oil?Not learned 139. You are in the process of servicing diesel generator engine lube oil filters on board your towing vessel. To where would you drain the filter housing lubricating oil contents prior to filter element replacement?Not learned 140. The rated speed of the main propulsion diesel engines on your offshore supply vessel is 900 rpm. The installed centrifugal overspeed trip device similar to the one shown in the illustration is designed to shut down the engine at 110% of rated speed. Upon testing the overspeed trip device, you determine that the actual shutdown occurs at 945 rpm. Which of the following would account for thisNot learned 141. You have just replaced a mechanically operated unit injector on a two-stroke cycle auxiliary diesel engine's #1 cylinder on your river push boat. You are using an injector timing tool to set the injector follower height. To do this you must ensure that the fuel cam follower is riding on the fuel cam base circle. Which of the following statements represents the best assurance that the crankshaft is properly positioned?Not learned 142. You are replacing an automotive type cooling water thermostat on one of the diesel generator sets on your ship docking tug. The markings on the original thermostat indicate that it was set to begin opening at 180°F. Which of the following thermostats marked for Celsius would be a replacement that comes closest to the value at which opening begins as compared to the original thermostat?Not learned 143. You are replacing a damaged high pressure fuel injection line for #1 cylinder on an auxiliary diesel engine onboard your fishery research vessel. Which of the following statements represents the best replacement practice or strategy?Not learned 144. The river push boat to which you are assigned is fitted with generator engines as partly shown in the illustration. What statement is true concerning the cylindersNot learned 145. 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 146. A Roots-blown, two-stroke cycle main propulsion engine on the fishing factory ship to which you are assigned is emitting excessive bluish-tinged smoke from the stack. Further investigation reveals excessive lube oil consumption. What condition would most likely account for this?Not learned 147. The salvage tug to which you are assigned has main engines fitted with intake and exhaust systems as shown in the illustration. Assume that the typical cylinder exhaust temperature at 75% of maximum, continuous rated load is between 850° and 900 F. What will happen to the typical cylinder exhaust temperature when the load is increased to 100% of maximum continuous rated loadNot learned 148. 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 149. When servicing dry-type air filters as used on the vessel to which you are assigned, which of the following criteria would be the most accurate for determining the need for servicing?Not learned 150. You are serving as a designated duty engineer onboard a harbor tug equipped with main propulsion diesel engines of the type shown in the illustration. What scavenging flow pattern is used in this engine typeNot learned 151. The uninspected fishing trawler to which you are assigned has diesel generators fitted with unit injectors with the operating principle as shown in the illustration. What statement is true concerning the beginning and ending of injectionNot learned 152. The ship-docking tug to which you are assigned has a fire pump drive engine as shown in the illustration. What statement concerning common air inlet and exhaust outlet pressures is true, if the engine is running at rated speedNot learned 153. The vessel to which you are assigned has main diesel engines fitted with intake and exhaust systems as shown in the illustration. Under what circumstances would the check valve open and bypass the rotary-lobe roots blowerNot learned 154. Before shutting down the main propulsion engines on a fishing industry factory ship, ideally what should be accomplished FIRST?Not learned 155. Since towing vessels take on fresh water from shore as a source of make-up water for the closed, re-circulating cooling water systems supporting diesel engines, what property of the make-up water is most important in contributing to cooling system problems?Not learned 156. When starting an auxiliary diesel engine in preparation for operation, what parameter must be checked FIRST upon start-up to avoid immediate engine damage?Not learned 157. 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 158. What statement is true concerning diesel engines, such as those used for main propulsion and auxiliary power on tugboats?Not learned 159. What statement is true concerning the primary purpose of an exhaust muffler/silencer fitted on the exhaust system for any diesel engine so equipped?Not learned 160. The steam generating plant on your articulated tug-barge unit is of the forced-circulation type. Which figure of the illustration represents a steam generator or boiler of this typeNot learned 161. Suppose the diesel generator set drive engines on your ocean-going tug are fitted with pressure- compensated governors as shown in the illustration. What is the significance of the oil inlet connection with this particular governorNot learned 162. Suppose the diesel generator set drive engines are of the type shown in the illustration on your ship docking tug. What description best represents the operating cycle and aspiration methodNot learned 163. Suppose the diesel generator set drive engines are of the type shown in the illustration on your ship docking tug. What description best represents the operating cycle and aspiration methodNot learned 164. Suppose the diesel generator set drive engines are of the type shown in the illustration on your towing vessel. Assuming the engine is naturally aspirated, within an individual cylinder in terms of piston stroke and position, under what circumstances are the intake and exhaust valves both openNot learned 165. Suppose the generator set drive engines on your ship docking tug are fitted with hydraulic isochronous governors such as shown in the illustration. How is the speed set point conveyed from the generator control panel on the main switchboard conveyed to the governor fitted on the diesel engineNot learned 166. Suppose the main propulsion diesel engines on your river pushboat are fitted with pressure-compensated governors as shown in the illustration. What function does the engine lube oil pressure connection provideNot learned 167. Suppose each of the main propulsion engines on your harbor assist tug is equipped with a variable speed governor equipped with a solenoid actuated shutdown device. After a high temperature alarm, after continuing to rise, what is the most likely engine high temperature condition that would initiate a safety trip shutdown?Not learned 168. Suppose one of the overhead camshafts on the V-type main propulsion diesel engines on your tug are fitted on the forward end with the device shown in the illustration. In addition to serving as a counterweight, what other function does the device serveNot learned 169. Suppose your ship docking tug is equipped with 4-stroke diesel generator set drive engines fitted with the type of charge air blower show in Fig. "B" of the illustration. In terms of the pressure of the charge air entering the intake manifold, what statement is trueNot learned 170. You suspect that a diesel generator set on your river push boat has a misfiring cylinder because the engine, although warm, is running roughly. The six-cylinder engine is fitted with a multi-plunger in-line high pressure fuel injection pump with hydraulically operated injector nozzles. When you slacken the high-pressure fuel line fitting at No. 5 fuel injector nozzle, the engine continues to run roughly as before with no real change. Upon re-tightening the high-pressure fuel line fitting, the engine begins and continues to run smoothly. What does this indicate?Not learned 171. You suspect that a diesel generator set on your general-purpose offshore supply vessel has a defective unit injector because the engine, although warm, is running roughly. The two-stroke engine is fitted with mechanically operated unit injectors. When you push and hold down the #3 cylinder injector follower, there is no real change, as the engine continues to run roughly as before. What does this indicate?Not learned 172. While taking a round in the engine room of your harbor tug, when is the best time to check the cylinder jacket water expansion tank level on a heat exchanger-cooled diesel generator with a pressurized cooling system where no sight glass or float indicator is provided?Not learned 173. The tank-type full-flow lubricating oil filter is situated on the discharge side of the engine-driven lube oil pump on the main engines on your fishing factory ship. Assuming oil pressure readings are observed at constant engine rpm and lube oil temperature, what is the indication of gradually clogging filter elements as long as the bypass relief valve remains closed?Not learned 174. In terms of the diesel fuels burned in auxiliary and main propulsion diesel engines onboard vessels, which of the listed fuel properties would be most critical to consider when transferring and forwarding fuel in extremely low ambient temperature conditions?Not learned 175. The thermal fluid heating oil system on your fishing industry factory ship is configured similarly to that shown in the illustration. What system component performs expansion and deaeration functionsNot learned 176. The towboat to which you are assigned has main diesel engines fitted with intake and exhaust systems as shown in the simplified illustration. What is the primary purpose of the intercoolerNot learned 177. The tractor tug to which you are assigned has main engines fitted with intake and exhaust systems as shown in the illustration. What statement best describes the configuration of the multiple turbochargersNot learned 178. The turbocharged, four-stroke, main propulsion diesel engines on your fishery research vessel are protected with dry-type air intake filters. The engines are fitted with dial-type restriction indicators measuring the pressure in the air duct between the air intake filter and the turbocharger blower inlet. Under what conditions should the air intake filters be evaluated using the restriction indicators?Not learned 179. The turbochargers on the main propulsion engines on the fishing factory ship to which you are assigned are fitted with an exhaust inlet screen to protect the turbocharger turbine. Upon inspection, pieces of broken piston rings or exhaust valves are found in the foreign object trap box. Why is it essential that this debris be removed prior to placing the engine back into operation?Not learned 180. The two-stroke cycle main propulsion engines on the harbor tug to which you are assigned are fitted with turbochargers for scavenging purposes. Assume that you are checking the air box drains in an installation that is valved with external drain piping to a drains tank. When you open the air box drain valves, no drainage occurs when in fact there is an accumulation of oil and moisture on the floor of the air boxes. What should you do?Not learned 181. The two-stroke cycle main propulsion engines on the supply boat to which you are assigned are fitted with Roots-type blowers for scavenging purposes. Upon inspection of the air boxes, what condition would indicate a need to replace the Roots-type blower immediately?Not learned 182. The various auxiliary diesel engines fitted on your ship-docking tug may employ a variety of different starting systems. What is the source of potential energy used to produce torque for the illustrated cranking motorNot learned 183. While warming up the main engines on your offshore utility vessel while tied up at your own pier, one of the main engines suddenly sounds the low lube oil pressure alarm. What is the appropriate initial response?Not learned 184. The winch drive engine on the harbor tug to which you are assigned is fitted with a Roots-type blower as shown in the illustration. What statement is true concerning this blowerNot learned 185. Wire brushing and scraping can be used to remove hard carbon deposits from exhaust system surfaces. When cleaning exhaust systems associated with the diesel engines on the tug to which you are assigned, what technique can effectively be used in conjunction with mechanical cleaning to loosen and soften up these hard carbon deposits?Not learned 186. What would be the most practical and efficient way of removing soot deposits from the fire-sides of the tubes of an auxiliary water-tube natural-circulation boiler as fitted on your platform supply vessel?Not learned 187. You are assigned to an offshore supply vessel fitted with main propulsion diesel engines of the type shown in the illustration. If the engine's crankshaft is turning at 720 rpm, what will be the rotational speed of the two camshaftsNot learned 188. An engine that runs rough or expels large amounts of black smoke may indicate a misfiring cylinder. Assume that the auxiliary diesel engines on your river push boat have a fuel injection system that permits the injectors to be disabled for troubleshooting purposes by loosening the high pressure fuel injection line fitting at the injector nozzle while the engine is running and noting the engine response. If before the injector is disabled the engine is running rough and expelling large amounts of black smoke, and after the injector is disabled, the engine continues to run equally rough, but the engine now produces a clear stack, what is indicated?Not learned