Q650 - Motor Plants, USCG prep certification 2026

Progress: 24% (23/94)

Learning progress ?

1. An air box fire on a turbocharged, two-stroke cycle main propulsion engine as fitted on your general purpose supply vessel can cause the destruction of a turbocharger due to overheat and overspeed. Upon inspection, besides blistering of paint on handhole covers, what is distinctive evidence that an air box fire had occurred?Not learned 2. 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 3. 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 4. 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 5. 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 6. 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 7. 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 8. The anchor handling vessel to which you are assigned has a pneumatic propulsion control system as shown in the illustration. Which control valve is responsible for by-passing the inflation delay orifice to insure rapid and positive reversals and to protect the clutches from excessive slipNot learned 9. You are assigned to an anchor handling supply vessel with a propulsion system as shown in figure "B" of the illustration. What type of propulsion system is illustratedNot learned 10. 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 11. 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 12. 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 13. 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 14. 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 15. 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 16. 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 17. 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 18. 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 19. 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 20. 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 21. The auxiliary steam boiler on your oil platform supply vessel is equipped with soot blowers for maintaining heat transfer efficiency. On which of the following auxiliary boiler types would soot blowers most likely be fitted?Not learned 22. 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 23. 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 24. 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 25. 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 26. 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 27. 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 28. 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 29. The deck winch on your ship-handling tug is fitted with a Woodward SG Type governor, as shown in the illustration. In addition to variable governed speed setting, what other group of settings is built into this particular governorNot learned 30. 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 31. 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 32. 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 33. 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 34. 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 35. On diesel engines used on a multi-purpose supply vessel, which type of injection system is most likely to use sophisticated electronic controls for timing and metering?Not learned 36. 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 37. 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 38. 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 39. 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 40. 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 41. 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 42. The drilling platform supply vessel to which you are assigned has diesel generators fitted with unit injectors of the type shown in the illustration. What statement is true concerning the operation of unit injectors of this typeNot learned 43. Due to the questionable mineral content of fresh water taken on from shore as a source of make-up water for diesel engine closed, recirculating cooling water systems, besides chemical treatment and coolant testing, what is the best line of defense in minimizing cooling system problems?Not learned 44. 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 45. 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 46. 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 47. 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 48. 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 49. 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 50. 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 51. Which of the following conditions best describes the reason for performing a bottom blow on an auxiliary steam boiler?Not learned 52. Which of the following fuel systems is characterized by a complete absence of high pressure fuel lines?Not learned 53. 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 54. The four-stroke cycle, turbocharged main propulsion engines on your fishing vessel are fitted with after coolers for the purposes of increasing the air charge density and total power output. The after cooler air ducts must be periodically drained to remove accumulated condensation. What combination of conditions dictate more frequent draining?Not learned 55. 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 56. The fresh water cooling systems serving the main engines on your uninspected fishing industry vessel are arranged as shown in the illustration. If there is excessive scale build up inside the tubes of an engine's shell and tube RW/FW heat exchanger, while the engine is in operation, what would be the resulting symptomsNot learned 57. 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 58. 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 59. 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 60. 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 61. The general purpose supply boat to which you are assigned is equipped with airflex pneumatic tire friction type propulsion clutches. If it is required to replace a clutch friction shoe, what statement is true?Not learned 62. A generator drive diesel engine on your general-purpose supply vessel has a misfiring cylinder. After further investigation it has been determined that the injector nozzle for the effected cylinder is faulty. After replacing the injector nozzle with a reconditioned or new one, the injector must be bled of air. Assuming the fuel injection pump is of the in-line multi-plunger type, how is this done?Not learned 63. 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 64. Great care should be taken to prevent a day tank from being pumped empty while a diesel engine is in operation. If this does happen on your OSV, the engine fuel and fuel injection system must be reprimed. What is accomplished during repriming?Not learned 65. The heating boiler on your multi-purpose supply vessel is of the type shown in the illustration. Which of the following arrangements describe a boiler of this typeNot learned 66. 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 67. 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 68. The lube oil quality management program used on your offshore supply vessel requires the on-board testing of lubricating oil viscosity at consistent temperatures. An unusual drop in lube oil viscosity indicates excessive dilution of the lubricating oil with diesel fuel oil. What fuel dilution percentage would be considered the maximum allowable and anything above warrants an oil change after repairs are made?Not learned 69. 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 70. 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 71. 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 72. 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 73. 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 74. 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 75. 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 76. 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 77. The main diesel propulsion engines on your uninspected fishing industry vessel are protected with a mechanical over speed trip mechanism similar to that shown in the illustration. Upon testing the trip setting, you discover that it is necessary to make an adjustment. Assuming that several adjustments may be necessary before the final setting is accurately achieved, what statement concerning adjustment is trueNot learned 78. 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 79. 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 80. 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 81. The main engines on your fishery research vessel utilize a starting system similar to that shown in the illustration. The air supply pressure and engine room ambient temperatures are both within the normal range. Upon attempted start-up, the engine turns very slowly, and the flow rate of air from the air starting motor exhaust is very low. Which of the listed conditions would most likely be the cause of the failure to startNot learned 82. 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 83. 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 84. 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 85. 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 86. A main propulsion diesel engine on your fishing factory ship has experienced a safety shutdown on high crankcase pressure which was accompanied by an alarm. After waiting 2 hours as recommended by the manufacturer, the crankcase is opened up and suitable repairs are accomplished. After re-closing the crankcase, the engine fails to start. Which of the following would account for this?Not learned 87. 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 88. 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 89. 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 90. 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 91. 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 92. 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 93. A main propulsion diesel engine on your offshore supply boat produces white smoke under all load conditions. What condition would most likely account for this?Not learned 94. 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 95. 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 96. 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 97. 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 98. 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 99. 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 100. 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 101. The mollusc dredger to which you are assigned is fitted with reduction gears as shown in the illustration. What statement is true concerning this type of reduction gearNot learned 102. 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 103. 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 104. The multi-purpose supply vessel to which you are assigned has diesel generators fitted with fuel systems as shown in the illustration. What statement is true concerning items "11", "13", and "15"Not learned 105. 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 106. 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 107. 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 108. What statement concerning fuel cetane rating and the ignition delay period is true as it applies to towboat main propulsion diesel engines?Not learned 109. Your offshore supply boat is fitted with cooling water systems serving the main propulsion diesel engines as shown in the illustration. What heat exchanger or cooler location would most likely be fitted with sacrificial zinc anodes which must be periodically inspected and replaced when sufficiently deterioratedNot learned 110. 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 111. 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 112. 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 113. 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 114. The offshore supply vessel to which you are assigned has a pneumatic propulsion control system as shown in the illustration. Which valve is responsible for processing a clutch inflation pressure at speed signal pilot pressure during periods of clutch slip maneuvering at low engine rpmNot learned 115. 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 116. 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 117. 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 118. Your oil platform supply vessel is fitted with a two-pass, fire-tube, oil-fired auxiliary boiler. What is the most practical way of determining if the outside surface of the boiler tubes are excessively scaled with hard scale deposits?Not learned 119. 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 120. 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 121. 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 122. 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 123. For an OSV operating within U.S. territorial waters, what type of fuel is generally used on auxiliary and main propulsion high speed diesel engines?Not learned 124. After performing repairs on the fuel injection system or governor of a main propulsion diesel engine on your fishing industry factory ship, what precaution should be taken prior to starting the engine?Not learned 125. 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 126. The platform supply vessel to which you are assigned has a main engine fuel system as shown in the illustration. When the filter and water separator as shown in the day tank fill line are combined into one unit, what is this calledNot learned 127. 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 128. 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 129. 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 130. In preparation for getting an offshore anchor handling vessel underway, what is the primary factor to consider in determining when it is prudent to increase the main propulsion engine rpm above idle and place a load on the engine? (Assume that there are no starting aids.)Not learned 131. 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 132. 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 133. 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 134. 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 135. 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 136. You are in the process of setting up a system for collecting engine data for trend analysis for the main propulsion engines on your offshore supply vessel. In terms of the conditions under which readings are to be taken and recorded, what statement is true?Not learned 137. 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 138. 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 139. 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 140. Before shutting down the main propulsion engines on a fishing industry factory ship, ideally what should be accomplished FIRST?Not learned 141. 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 142. What statement is true concerning diesel engines, such as those used for main propulsion and auxiliary power on tugboats?Not learned 143. 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 144. The steam generating plant on your fishing industry factory ship is of the type shown in the illustration. Which of the labeled components would be the steam separatorNot learned 145. 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 146. You suspect that a diesel generator set on your offshore supply boat has a misfiring cylinder because the engine, although warm, is running roughly. The six-cylinder engine is fitted with a high-pressure distributor type pump with hydraulically operated injector nozzles. When you slacken the high-pressure fuel line at #4 fuel injector nozzle, the engine runs even rougher than before. Upon re-tightening the high-pressure fuel line fitting, the engine reverts back to the original roughness before the fitting was slackened. What does this indicate?Not learned 147. You suspect that a diesel generator set on your OSV 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 #3 fuel injector nozzle, the engine continues to run roughly as before with no real change. Upon re-tightening the high pressure fuel line fitting, there is no real change, as the engine continues to run roughly as before. What does this indicate?Not learned 148. 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 149. 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 150. A turbocharged, two-stroke cycle main propulsion diesel engine on your OSV is emitting gray to black smoke excessively from the stack. Upon comparing the measured air box pressure against a reference engine which is producing a clear stack, the measured air box pressure is determined to be too high. Which of the following conditions would most likely be the cause for the relatively high air box pressure?Not learned 151. 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 152. 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 153. 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 154. While underway in open waters on your commercial crabbing vessel, the low clutch air pressure alarm sounds and the faint odor of burning rubber is detected. What is the appropriate response?Not learned 155. 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 156. 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 157. 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 158. Water-jacketed exhaust manifolds as used on anchor-handling supply vessel main engines require periodic inspection of the jackets and scale removal as necessary. What would be the impact of a failure to remove scale deposits on a timely basis?Not learned 159. 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 160. 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 161. 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 162. 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 163. 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 164. 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