Q630 - Motor Plants, USCG prep certification 2026

Progress: 24% (23/94)

Learning progress ?

1. 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 2. 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 3. 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 4. 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 5. The fishing industry factory ship to which you are assigned has a main propulsion engine of the type shown in the illustration. In terms of piston action, operating cycle, and piston type, what statement is true concerning this engine typeNot learned 6. 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 7. 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 8. You are assigned to a fishery research vessel fitted with main propulsion diesel engines operating on the cycle represented in the polar timing diagram shown in the illustration. When do the intake valves open and close respectivelyNot learned 9. You are assigned to an offshore supply vessel fitted with main propulsion diesel engines of the type shown in the illustration. How many degrees of crankshaft revolution are required for all of the engine's cylinders to fireNot learned 10. 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 11. Assuming the use of low sulfur content diesel fuel, what combination of conditions associated with uninspected fishing industry vessel engine room operations would most contribute to internal corrosion of exhaust systems?Not learned 12. 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 13. 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 14. 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 15. 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 16. 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 17. 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 18. 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 19. 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 20. When checking the crankcase oil level on a main propulsion engine on your offshore oil spill response vessel while underway, what should be the oil level as indicated on the dipstick?Not learned 21. 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 22. In a closed, re-circulating fresh water cooling system used for the main engines on your vessel, what function would chemical treatment with molybdate primarily perform?Not learned 23. Concerning the diesel fuels used for the auxiliary and main propulsion diesel engines on-board the offshore supply vessel to which you are assigned, what fuel property is directly a measure of the ignition quality of the fuel?Not learned 24. 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 25. 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 26. 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 27. For diesel engines, such as those used for main propulsion and auxiliary power on offshore supply vessels, while running at speed, how is the ignition of fuel within the cylinder achieved?Not learned 28. 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 29. 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 30. The diesel generators on the platform supply vessel to which you are assigned are fitted with a charge air system as shown in the illustration. What statement is true concerning this type of charge air systemNot learned 31. 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 32. 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 33. 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 34. 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 35. 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 36. 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 37. 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 38. 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 39. 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 40. 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 41. The oil platform supply vessel to which you are assigned has a pneumatic propulsion control system as shown in the illustration. When the mechanical slave remote control station is being used to control propulsion, what is the direct result of positioning the control lever in the ahead directionNot learned 42. Which of the following closed, re-circulating cooling water system problems associated with marine diesel engines is defined as an electro-chemical process by which a metal (such as iron) returns to its natural oxide state?Not learned 43. Which of the following conditions best describes the reason for performing a bottom blow on an auxiliary steam boiler?Not learned 44. Which of the following fuel systems is characterized by a complete absence of high pressure fuel lines?Not learned 45. 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 46. The fresh water cooling systems of the main engines on your fishing vessel are configured as shown in the illustration. During normal engine operation which of the listed fresh water temperature locations would indicate the highest temperatureNot learned 47. 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 48. The fresh water cooling systems serving the main engines on your platform supply vessel are configured as shown in the illustration. While the effected main engine is in operation, what would be the impact of RW/FW heat exchanger and lube oil cooler tube leaks respectivelyNot learned 49. 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 50. 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 51. 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 52. The harbor tug to which you are assigned has a diesel engine fitted with a rotary plunger distributor type pump. Which figure of the illustration represents the most likely type of fuel injection equipment usedNot learned 53. The harbor tug to which you are assigned has diesel generators fitted with intake and exhaust systems that includes the device as shown in figure "A" of the illustration. What is the name of this deviceNot learned 54. 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 55. 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 56. The heating boiler on your harbor tug is of the type shown in the illustration. Which of the following arrangements describe a boiler of this typeNot learned 57. The heating plant on your anchor handling supply vessel is of the type shown in the illustration. What statement is true concerning the system pumpsNot learned 58. The lubricating oil system supporting the main propulsion reduction gear on your offshore supply vessel is fitted with a lube oil strainer as shown in the illustration. How often should the handle "A" be rotated for cleaning purposesNot learned 59. The lubricating oil system supporting the main propulsion reduction gear on the harbor tug to which you are assigned is fitted with a lube oil strainer as shown in the illustration. Which of the following maintenance actions is performed most often in terms of frequencyNot learned 60. 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 61. 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 62. 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 63. The main diesel engines on the OSV to which you are assigned are fitted with a basket type lube oil strainer, which must be periodically cleaned. The engine manufacturer recommends using a petroleum-based solvent for cleaning. Which of the following would typically be acceptable?Not learned 64. The main diesel engines on the uninspected fishing industry vessel to which you are assigned are fitted with a metal-edge duplex suction fuel strainer, where the elements must be periodically cleaned. The engine manufacturer recommends using a petroleum-based solvent for cleaning. Which of the following would typically be acceptable?Not learned 65. 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 66. The main engines on your oil platform supply vessel are fitted with speed control governors of the type shown in the illustration. If the shutdown solenoid is de-energized during normal operation, which of the following scenarios depicts the response on a safety shutdown where the shutdown plunger rod moves downward unseating the ball check valve when the shutdown solenoid energizesNot learned 67. 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 68. The main engines on your offshore supply vessel utilize a starting system similar to that shown in the illustration. When starting the engine, an excessive amount of oil mist exits the air starter exhaust port. Which of the listed conditions would account for thisNot learned 69. 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 70. 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 71. The main propulsion diesel engines fitted on your uninspected fishing industry vessel are started with vane- type air-starting motors. What statement concerning air-start motor lubricator maintenance is true? (Assume a metal bowl fitted with a tubular sight glass.)Not learned 72. The main propulsion diesel engines on your salvage tug are protected with a high coolant temperature switch used as an alarm contact maker to warn operating personnel of the potential danger of an overheated engine. If the switch is fitted with a test button, what is this used for?Not learned 73. 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 74. 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 75. 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 76. 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 77. 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 78. 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 79. The manufacturer of the main propulsion diesel engines on your harbor tug specifies the requirements for fresh water makeup for the closed, re-circulating fresh water cooling system as shown in the illustration. Which of the following examples of fresh water test results would be considered acceptable by the manufacturer for coolant makeup or initial fillingNot learned 80. 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 81. 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 82. 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 83. 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 84. 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 85. What statement concerning fuel cetane rating and the ignition delay period is true as it applies to towboat main propulsion diesel engines?Not learned 86. The tractor tug to which you are assigned has diesel generators fitted with a fuel injection system that have a complete absence of high pressure fuel lines. Which figure of the illustration represents the most likely type of fuel injection equipment usedNot learned 87. 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 88. 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 89. The offshore supply vessel to which you are assigned has main engines fitted with intake and exhaust systems as shown in the illustration. What statement is true concerning the turbocharger charge air discharge arrangementsNot learned 90. The oil-fired auxiliary boiler on your river push boat experiences a safety shutdown requiring a reset of the flame safeguard control to restart the boiler once the safety shutdown condition has been corrected. Which of the following conditions would best account for this?Not learned 91. In order to minimize the abrasive action of dust particles entering the combustion spaces of the diesel engines used on the offshore supply vessel to which you are assigned, each engine is protected with a heavy-duty air intake filter. Which one of the listed air intake filter elements is periodically cleaned as opposed to being periodically replaced with a new element?Not learned 92. 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 93. The pneumatic propulsion control system used on your oil platform 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 lubrication upon reassemblyNot learned 94. 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 95. In preparation for getting a platform supply vessel underway, what is the primary factor to consider in whether or not pre-lubrication of the main propulsion engines shall be necessary?Not learned 96. 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 97. The pressure-volume (P-V) diagram shown in the illustration represents a theoretical diesel engine cycle which ideally represents all diesel engines, including those used in the towing industry. What statement is true concerning the combustion cycle event represented between points "2" and "3" in figure "B" of the illustrationNot learned 98. 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 99. 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 100. 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 101. The raw water boxes of the freshwater coolers serving the main propulsion diesel engines on your uninspected fishing industry vessel are fitted with sacrificial zinc anodes. Upon inspection, at what percentage of deterioration should the zinc anodes be replaced?Not learned 102. Related to the diesel fuels used in auxiliary and main propulsion diesel engines used on the ship-docking tug to which you are assigned, the unit of measure expressed as centistokes (cSt) is a measure of what fuel property?Not learned 103. 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 104. 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 105. 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 106. 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 107. The sea-going tug to which you are assigned has main engines fitted with intake and exhaust systems as shown in the illustration. What statement is true concerning the turbocharger exhaust piping arrangementsNot learned 108. 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 109. Your ship-docking tug is fitted with an electric auxiliary steam boiler. What statement best represents the criteria for heating element removal, inspection, and servicing where the boiler is fitted with six elements consisting of upper and lower delta connected groups?Not learned 110. Before shutting down the main propulsion engines on a fishing industry factory ship, ideally what should be accomplished FIRST?Not learned 111. 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 112. 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 113. What statement is true concerning diesel engines, such as those used for main propulsion and auxiliary power on tugboats?Not learned 114. 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 115. 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 116. 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 117. 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 118. 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 119. 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 120. 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 121. 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 122. You suspect that a diesel generator set on your ocean-going tug has a faulty unit injector because the engine, although warm, is running roughly. The two-stroke six-cylinder engine is fitted with mechanically operated unit injectors. When you push and hold down the injector follower of the No. 4 unit injector, the engine runs even rougher than before. What does this indicate?Not learned 123. 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 124. 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 125. 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 126. 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 127. 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 128. The turbochargers on the main propulsion engines on the OSV 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. Besides removing this debris, with respect to the screen what should be done?Not learned 129. 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 130. 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 131. The various auxiliary diesel engines fitted on your harbor tug may employ a variety of different cranking methods for engine starting. What type of cranking motor is shown in the illustrationNot learned 132. The various auxiliary diesel engines fitted on your offshore oil spill response vessel may employ a variety of different starting systems. What type of starting system is shown in the illustrationNot learned 133. 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 134. 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 135. 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 136. 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 137. 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 138. 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