Q690 - Motor Plants, USCG prep certification 2026

Progress: 24% (23/94)

Learning progress ?

1. The bore of a diesel engine cylinder describes the __________.Not learned 2. The main operating characteristic of diesel engines which distinguishes them from other internal combustion engines is the __________.Not learned 3. The minimum fuel oil delivery pressure required for efficient injection depends primarily on the __________.Not learned 4. Which of the air intake systems listed will result in the lowest specific fuel consumption?Not learned 5. A 4-stroke, medium-speed, eight cylinder, in-line diesel engine has a firing order of 1-5-2-6-8-4-7-3. When performing routine valve maintenance, #1 cylinder is set at TDC in firing position. Which exhaust valves can be checked for proper valve lash?Not learned 6. What is the function of a diesel engine's stationary parts?Not learned 7. The purpose of an oil mist detector in a main propulsion diesel engine is to warn of __________.Not learned 8. Which statement about diesel engine combustion is true?Not learned 9. What type of marine engine has a fuel nozzle and combustion chamber located between two pistons in a common cylinder liner?Not learned 10. In a diesel engine, which type of wrist pin is fixed to the small end of the connecting rod and moves in the piston?Not learned 11. Which of the following is an example of a solid bearing?Not learned 12. The small end of the connecting rod is attached to the piston with a __________.Not learned 13. Which of the devices listed is installed on a diesel engine to isolate some of the crankshaft vibrations caused by rotational and reciprocating forces?Not learned 14. The camshaft drive is designed to maintain proper camshaft speed relative to crankshaft speed. In maintaining this relationship, the camshaft drive causes the camshaft to rotate at __________.Not learned 15. The valve stem expansion associated with engine warm-up is allowed for by the __________.Not learned 16. Load control on a diesel engine is accomplished by __________.Not learned 17. Diesel engines driving alternators operating in parallel must maintain a set frequency regardless of load changes. The governor characteristic used to accomplish this is known as __________.Not learned 18. Which of the following statements is true concerning the cetane number of diesel fuel?Not learned 19. To minimize corrosion, what are fuel oil strainer disks, spacers and scraper blades made of?Not learned 20. What is the primary purpose of a fuel injection system, besides metering and atomizing fuel?Not learned 21. Why must fuel droplets injected into a diesel engine cylinder have adequate penetration?Not learned 22. As shown in the illustration of the fuel injection pump, the component labeled "N" would be identified as the __________Not learned 23. A diesel engine should use which type of lubricating oil?Not learned 24. In a normally operating diesel engine, the main source of lubricating oil contamination in the crankcase is a result of the __________.Not learned 25. Lube oil pumps taking suction from the sump of most small marine engines are usually __________.Not learned 26. Most large main propulsion diesel engines use a duplex lube oil strainer to __________.Not learned 27. If the jacket water temperature rises rapidly above normal in a diesel engine, you should FIRST __________.Not learned 28. A large, low-speed, main propulsion diesel engine uses sea water to directly cool the __________.Not learned 29. Cooling the intake air supplied to a diesel engine will __________.Not learned 30. The process of scavenging a two-stroke cycle diesel engine serves to __________.Not learned 31. Clearance volume scavenging in a turbocharged, four-stroke cycle diesel engine is accomplished __________.Not learned 32. When would the available energy of the exhaust gases of a two-stroke cycle diesel engine be insufficient to drive an exhaust gas turbocharger, resulting in the incorrect amount of air for combustion?Not learned 33. In a diesel engine exhaust system, the cooling of the exhaust gases below their dew point, will result in __________.Not learned 34. Exhaust pipes for separate main propulsion diesel engines can be combined only when __________.Not learned 35. One advantage of electromagnetic slip couplings is __________.Not learned 36. Which of the routine maintenance procedures listed is required for starting air receivers?Not learned 37. Electric starting motors for diesel engines require high current for operation and __________.Not learned 38. Auxiliary diesel engine electric starting motors use __________.Not learned 39. Starting a large low-speed propulsion diesel engine on diesel fuel during cold weather conditions will be made easier by __________.Not learned 40. 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 41. 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 42. 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 43. You are assigned as an engineer on a fishing research vessel using main propulsion engines of the type shown in the illustration. What statement represents the procedure for inspection of the upper cylinder liner bore while in place inside the engineNot learned 44. 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 45. 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 46. 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 47. You are assigned to an uninspected fishing industry line vessel fitted with main propulsion diesel engines operating on the cycle represented in the polar timing diagram shown in the illustration. What events or effects are represented by "II", "III", and "IV" respectivelyNot learned 48. 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 49. 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 50. 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 51. 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 52. The auxiliary steam boiler on your vessel is equipped with a gauge glass for local level indication. On which of the following auxiliary boiler types would this gauge glass be attached to a flash chamber also known as a steam accumulator or steam separator?Not learned 53. 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 54. 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 55. 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 56. 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 57. 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 58. 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 59. 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 60. The closed, recirculating system coolant in the main engines used on your anchor handling supply vessel consists of heavy-duty antifreeze and supplemental coolant additive. The coolant has been tested and the antifreeze, molybdate, and nitrite concentrations are all within acceptable limits and the pH is also within acceptable limits. According to the test-strip comparison chart shown in the illustration, which set of indications corresponds with thisNot learned 61. A deck winch drive engine fuel system on board your uninspected fishing industry vessel is prone to becoming air bound, and you suspect a fuel system piping leak. Assuming that the diesel fuel tank is beneath the engine, that the fuel booster pump is engine driven, and that the fuel injection pump is a high-pressure multi-plunger pump, where in the system would the leak most likely exist?Not learned 62. 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 63. 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 64. 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 65. 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 66. 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 67. 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 68. The water inlet manifold for the diesel engine shown in the illustration is represented by the letter or number __________Not learned 69. 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 70. 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 71. 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 72. 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 73. 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 74. 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 75. 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 76. The expansion tank for a diesel engine closed cooling system is designed to maintain a constant head on the system and __________.Not learned 77. 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 78. 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 79. 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 80. 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 81. 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 82. The fishing industry seiner to which you are assigned has an engine as shown in the illustration. What statement concerning air box and exhaust manifold pressure is true, if the engine is running at rated speedNot learned 83. 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 84. Which of the following fuel systems is characterized by a complete absence of high pressure fuel lines?Not learned 85. Which of the following statements is true concerning the diesel engine cylinder head and valve mechanism shown in the illustrationNot learned 86. 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 87. 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 88. 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 89. 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 90. 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 91. 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 92. The fuel injector shown in the illustration is opened by fuel pressure acting upward on __________Not learned 93. 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 94. How is the illustrated strainer element cleaned during engine operationNot learned 95. The item labeled #16 in the illustration is a stack of spring washers. Their function is to __________Not learned 96. 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 97. 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 98. 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 99. 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 100. 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 101. 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 102. 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 103. 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 104. 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 105. 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 106. 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 107. 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 108. The main propulsion diesel engines fitted on your fishing industry factory ship are started with compressed air using the system illustrated. What would be the FIRST consequence of having the start solenoid valve energized open by depressing the start buttonNot learned 109. 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 110. 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 111. 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 112. The main propulsion engines onboard your fishery research vessel use a lubricating oil system as shown in the illustration. Under what circumstances will the turbo soak-back pump operateNot learned 113. 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 114. 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 115. The manufacturer of the main propulsion diesel engines on your uninspected fishing trawler specifies the requirements for total hardness of freshwater makeup for the closed, recirculating freshwater cooling system in milligrams per liter (mg/L). If the freshwater test reported a total hardness of 5.7 grains per gallon (gpg), using the conversion chart of the illustration, what would be the total hardness in mg/LNot 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 is fitted with reduction gears as shown in the illustration. What statement is true concerning this type of reduction gearNot learned 119. 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 120. The uninspected fishing vessel 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 endsNot learned 121. 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 122. What statement concerning fuel cetane rating and the ignition delay period is true as it applies to towboat main propulsion diesel engines?Not learned 123. 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 124. You are about to perform valve stem to rocker arm clearance adjustments on an auxiliary diesel engine onboard your offshore supply vessel. Which of the following statements concerning hot and cold clearances is true?Not learned 125. 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 126. The pinion gear shown in the illustration, is located __________Not 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 towing vessel is configured as shown in the illustration. In terms of clutch air system maintenance, what statement best represents operational requirementsNot 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. The power/expansion stroke shown in the illustration is indicated by the diagram numbers __________Not learned 131. Pre-combustion chambers and energy cells in high-speed, small bore diesel engines all serve to increase ________.Not learned 132. 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 133. 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 134. 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 135. 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 136. You are serving as an engineer onboard a mollusc dredger equipped with main propulsion diesel engines of the type shown in the illustration. What scavenging flow pattern is used in this engine typeNot learned 137. 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 138. Before shutting down the main propulsion engines on a fishing industry factory ship, ideally what should be accomplished FIRST?Not learned 139. 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 140. 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 141. 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 142. 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 143. A turbocharged, two-stroke cycle main propulsion diesel engine on your fishery research vessel 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 low. Which of the following conditions would most likely be the cause for the relatively low air box pressure?Not learned 144. 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 145. 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 146. What type of bearing is shown in the illustrationNot learned 147. Which type of diesel engine fuel nozzle is shown in the illustrationNot learned 148. 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 149. The uninspected fishing trawler 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 150. Using the oil chart provided in the illustration for guidance, which of the oils listed below would provide the best protection against high governor oil operating temperatures for speed control applications for fishing industry main propulsion diesel enginesNot learned 151. Using the oil chart provided in the illustration for guidance, which synthetic oil would be capable of providing adequate lubrication of the main engine speed control governor on your vessel, if the governor oil operating temperature shall be in the ideal operating range of 130°F to 205°FNot learned 152. Using the oil chart provided in the illustration for guidance, what would be the recommended straight weight petroleum oil to use in a main engine speed control governor on your fishery research vessel, if the governor is to remain in the acceptable operating range and the governor oil operating temperature may drop as low as 40°FNot learned 153. 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 154. 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 155. 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 156. 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 157. 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 158. 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 159. 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 160. 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 161. 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