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Motor Plants and Auxiliary Boilers - USCG Exam Questions

Diesel engine theory and operation, fuel and lubrication systems, starting and reversing, and auxiliary boilers.

Every question below is a real U.S. Coast Guard exam question with four choices. Answer one and the correct choice is revealed instantly, with the USCG reference and illustration where the question uses one.

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All Motor Plants and Auxiliary Boilers questions

Questions 1,301–1,400 of 1,433 · page 14 of 15

  1. #1878 According to the manufacturer's recommendations for a main propulsion diesel engine on an oil rig supply vessel where the fuel oil day tank is above t...
  2. #1879 You suspect that a diesel generator set on your anchor-handling supply vessel has a misfiring cylinder because the engine, although warm, is running r...
  3. #1880 You suspect that a diesel generator set on your offshore supply boat has a misfiring cylinder because the engine, although warm, is running roughly. T...
  4. #1881 The turbocharged, four-stroke, diesel generator set drive engines on your OSV are protected with dry-type air intake filters. The filter element condi...
  5. #1882 In order to determine the restriction across a dry-type air filter on one of the diesel engines on your general- purpose supply boat, the engine shoul...
  6. #1883 A main propulsion diesel engine on your anchor-handling supply vessel produces gray to black smoke under virtually all load conditions as observed at...
  7. #1884 A diesel engine on your platform supply vessel has a restricted exhaust silencer/muffler resulting in high exhaust back pressure. With an appreciable...
  8. #1885 A turbocharged, two-stroke cycle main propulsion diesel engine on your OSV is emitting gray to black smoke excessively from the stack. Upon comparing...
  9. #1886 A Roots-blown, two-stroke cycle main propulsion engine on the platform supply vessel to which you are assigned is emitting excessive, bluish-tinged sm...
  10. #1887 The offshore supply vessel to which you are assigned is fitted with reversing reduction gears equipped with airflex pneumatic tire-type friction clutc...
  11. #1888 The OSV 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... illustration
  12. #1889 The oil platform supply vessel to which you are assigned is fitted with a totally pneumatic propulsion control system as shown in the illustration. If... illustration
  13. #1890 The offshore supply vessel to which you are assigned is fitted with a totally pneumatic propulsion control system as shown in the illustration. If pro... illustration
  14. #1891 A main propulsion diesel engine on your anchor-handling supply boat has experienced a safety shutdown on high crankcase pressure which was accompanied...
  15. #1892 A main engine on your general-purpose supply vessel has experienced a low coolant water level alarm even though the water level in the expansion tank...
  16. #1893 Your offshore supply vessel is fitted with a coil-type, forced-circulation, water-tube, oil-fired auxiliary boiler. What is the most practical way of...
  17. #1894 In a closed, recirculating freshwater cooling system used for the diesel-generators on your offshore supply vessel, what function would chemical treat...
  18. #1895 After a main diesel engine on your oil platform construction support vessel has experienced a safety shutdown due to excessive crankcase pressure, why...
  19. #1896 When rolling over a main engine on your anchor handling vessel prior to starting with the cylinder test valves open to expel any fluids accumulated wi...
  20. #1897 You are assigned to an anchor handling vessel fitted with main propulsion diesel engines operating on the cycle represented in the polar timing diagra... illustration
  21. #1898 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...
  22. #1899 The raw water boxes of the freshwater coolers serving the main propulsion diesel engines on your offshore supply vessel are fitted with sacrificial zi...
  23. #1900 The pneumatic propulsion control system used on your anchor-handling supply vessel uses a diaphragm- operated relay valve as shown in the illustration... illustration
  24. #1901 The auxiliary oil-fired water-tube steam boiler on your platform supply vessel is equipped with a water column similar to that shown in the illustrati... illustration
  25. #1902 Diesel engine closed, recirculating cooling water systems are particularly prone to cavitation corrosion/erosion. Which of the listed cooling system/e...
  26. #1903 The multi-purpose supply vessel to which you are assigned has main engines fitted with injectors similar to those shown in the illustration. What stat... illustration
  27. #1904 The multi-purpose supply vessel to which you are assigned has a deck winch drive engine fitted with fuel injectors with the operating principle as sho... illustration
  28. #1905 The anchor handling supply vessel to which you are assigned has diesel generators fitted with fuel injectors with the operating principle as shown in... illustration
  29. #1906 The auxiliary engines on the offshore supply vessel to which you are assigned are fitted with Roots-blowers as shown in the illustration. What stateme... illustration
  30. #1907 The oil spill response vessel to which you are assigned is fitted with reduction gears as shown in the illustration. What statement is true concerning... illustration
  31. #1908 The offshore supply vessel to which you are assigned has a pneumatic propulsion control system as shown in the illustration. Which valve is responsibl... illustration
  32. #1909 You are assigned to a fishing industry factory ship fitted with main propulsion diesel engines of the type shown in the illustration. If the engine's... illustration
  33. #1910 You are assigned to a fishery research vessel fitted with main propulsion diesel engines operating on the cycle represented in the polar timing diagra... illustration
  34. #1911 The uninspected fishing trawler to which you are assigned is fitted with main propulsion diesel engines of the type shown in the illustration. In term... illustration
  35. #1912 When checking the crankcase oil level on a main propulsion engine on your fishing industry line vessel while underway, what should be the oil level as...
  36. #1913 You are assigned as an engineer on an uninspected fishing industry vessel using main propulsion engines of the type shown in the illustration. Assumin... illustration
  37. #1914 The uninspected fishing trawler to which you are assigned is fitted with auxiliary engines as partly shown in the illustration. What statement is true... illustration
  38. #1915 The mollusc dredger to which you are assigned is fitted with generator set drive engines as shown in the illustration. What statement is true in terms... illustration
  39. #1916 When checking the valve stem to rocker arm clearances on an auxiliary diesel engine onboard your fishery research vessel, which of the following state...
  40. #1917 The main propulsion diesel engines fitted on your fishing industry factory ship are started with compressed air using the system illustrated. What wou... illustration
  41. #1918 The various auxiliary diesel engines fitted on your fishery research vessel may employ a variety of different starting systems. What type of starting... illustration
  42. #1919 The main propulsion diesel engines used to power the fishing vessel to which you are assigned are started with vane-type air-starting motors designed...
  43. #1920 The main propulsion engines onboard your uninspected fishing trawler use a lubricating oil system as shown in the illustration. What item number repre... illustration
  44. #1921 The diesel generator engines onboard your mollusc dredger use a lubricating oil filtration scheme as shown in the illustration. What type of filtratio... illustration
  45. #1922 A diesel generator set on your fishing industry factory ship has a simplex lube oil strainer of the type shown in the illustration, situated on the di... illustration
  46. #1923 The fishery research vessel to which you are assigned has a main engine fuel system as shown in the illustration. Besides preventing the attached fuel... illustration
  47. #1924 The main engines on the fishing factory ship to which you are assigned are fitted with duplex secondary spin- on fuel filters. Concerning the selector...
  48. #1925 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 il... illustration
  49. #1926 The uninspected fishing trawler to which you are assigned has diesel generators fitted with unit injectors with the operating principle as shown in th... illustration
  50. #1927 The mollusc dredger to which you are assigned has diesel generators fitted with unit injectors of the type shown in the illustration. What statement i... illustration
  51. #1928 The generator drive diesel engines on your fishing trawler are fitted with a multi-plunger injection pump with high pressure fuel lines leading to eac...
  52. #1929 The turbocharged, four-stroke, main propulsion diesel engines on your fishery research vessel are protected with dry-type air intake filters. The engi...
  53. #1930 The fishing industry seiner to which you are assigned has an engine as shown in the illustration. What statement concerning air box and exhaust manifo... illustration
  54. #1931 A main propulsion diesel engine on your fishing trawler produces gray to black smoke under virtually all load conditions as observed at the stack. The...
  55. #1932 Your fishing factory ship is fitted with cooling water systems serving the main propulsion diesel engines as shown in the illustration. Which heat exc... illustration
  56. #1933 The freshwater cooling systems serving the main engines on your uninspected fishing industry vessel are arranged as shown in the illustration. If ther... illustration
  57. #1934 The auxiliary engines on the uninspected fishing trawler to which you are assigned are fitted with Roots- blowers as shown in the illustration. What s... illustration
  58. #1935 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 prot...
  59. #1936 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... illustration
  60. #1937 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 c...
  61. #1938 The mollusc dredger to which you are assigned has a pneumatic propulsion control system as shown in the illustration. What statement is true concernin... illustration
  62. #1939 The engine manufacturer for the main engines used on your mollusc dredger specifies a supplemental coolant additive consisting of molybdate and nitrit... illustration
  63. #1940 In a closed, recirculating fresh water cooling system used for the main engines on your mollusc dredger, what function would chemical treatment with n...
  64. #1941 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 d...
  65. #1942 While warming up the main engines on your uninspected fishing trawler while tied up at your own pier, one of the main engines suddenly sounds the low...
  66. #1943 The pneumatic propulsion control system used on the fishing vessel to which you are assigned uses a diaphragm-operated relay valve as shown in the ill... illustration
  67. #1944 The main engines on your fishing industry line vessel are equipped with manual shutdown levers as shown in the illustration. What statement concerning... illustration
  68. #1945 The main diesel propulsion engines on your uninspected fishing industry vessel are protected with a mechanical over speed trip mechanism similar to th... illustration
  69. #1946 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 purp... illustration
  70. #1947 The thermal fluid heating oil system on your fishing industry factory ship is configured similarly to that shown in the illustration. What system comp... illustration
  71. #1948 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 r...
  72. #1949 You are serving as an engineer onboard a mollusc dredger equipped with main propulsion diesel engines of the type shown in the illustration. What scav... illustration
  73. #1950 You are assigned to a fishing factory ship fitted with main propulsion diesel engines of the type shown in the illustration. If the engine's crankshaf... illustration
  74. #1951 You are assigned as an engineer on a fishing industry factory ship using main propulsion engines of the type shown in the illustration. Assuming that... illustration
  75. #1952 You are in the process of setting up a system for collecting engine data for trend analysis for the main propulsion engines on your uninspected fishin...
  76. #1953 When starting a main propulsion diesel engine fitted with attached pumps in preparation for getting underway on your fishery research vessel, what par...
  77. #1954 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 ter... illustration
  78. #1955 The deck winch drive engine onboard your fishing seiner uses a lubricating oil filtration scheme as shown in the illustration. What type of filtration... illustration
  79. #1956 The mollusc dredger to which you are assigned has diesel generator engines fitted with intake and exhaust systems as shown in the illustration. What t... illustration
  80. #1957 The diesel generators on the fishing industry seiner to which you are assigned are fitted with a charge air system as shown in the illustration. What... illustration
  81. #1958 The fishing industry factory ship to which you are assigned is fitted with main propulsion engines driving through pneumatic airflex clutches as shown... illustration
  82. #1959 The fishing seiner to which you are assigned has a pneumatic propulsion control system as shown in the illustration. When the mechanical slave remote... illustration
  83. #1960 The main engines on your uninspected fishing trawler are equipped with over speed trip devices as shown in the illustration. What statement concerning... illustration
  84. #1961 The main engines on your fishing industry factory ship are fitted with speed control governors of the type shown in the illustration. If the shutdown... illustration
  85. #1962 The deck winch on your fishing industry seiner is fitted with a speed control governor of the type shown in the illustration. In addition to variable... illustration
  86. #1963 You are replacing a damaged high pressure fuel injection line for #1 cylinder on an auxiliary diesel engine onboard your fishery research vessel. Whic...
  87. #1964 The main propulsion diesel engines on the fishery research vessel to which you are assigned are started with vane-type air-starting motors. At a minim...
  88. #1965 An auxiliary diesel engine on your fishing trawler uses a starting system similar to the one shown in the illustration. The hand pump is capable of ch...
  89. #1966 The diesel generator sets on your mollusc dredger use a starting system similar to the one shown in the illustration. While the engine is running, the... illustration
  90. #1967 A diesel generator set on your fishing trawler has a simplex lube oil strainer of the type shown in the illustration, situated on the discharge side o... illustration
  91. #1968 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...
  92. #1969 Which fishing vessel diesel fuel oil day tank condition would be most likely to result in water contaminated fuel?
  93. #1970 On diesel engines used on a fishing industry factory ship, which type of injection system is most likely to use sophisticated electronic controls for...
  94. #1971 The fishery research vessel to which you are assigned has diesel generators fitted with fuel injectors of the type shown in figure "2" of the illustra... illustration
  95. #1972 The main propulsion diesel engines on the fishery research vessel to which you are assigned are fitted with mechanically operated and controlled unit...
  96. #1973 Assuming the use of low sulfur content diesel fuel, what combination of conditions associated with uninspected fishing industry vessel engine room ope...
  97. #1974 The freshwater cooling systems serving the main engines on your fishing factory ship are arranged as shown in the illustration. If coolant drain valve... illustration
  98. #1975 The two-stroke cycle main propulsion engines on the fishing trawler to which you are assigned are fitted with Roots-type blowers for scavenging purpos...
  99. #1976 The fishing trawler to which you are assigned is fitted with hydraulic clutches similar to that shown in the illustration. If the time required for th... illustration
  100. #1977 The fishing factory ship to which you are assigned is fitted with a totally pneumatic propulsion control system as shown in the illustration. If the a... illustration

Motor Plants and Auxiliary Boilers questions: what to expect

Q How many Motor Plants and Auxiliary Boilers questions are in the Engine pool?

There are 1,433 Motor Plants and Auxiliary Boilers questions on this site, every one released by the U.S. Coast Guard or taken from the National Maritime Center's sample examinations, with its correct answer. The exam draws its Motor Plants and Auxiliary Boilers module from the same pool.

Q What score do I need to pass the Motor Plants and Auxiliary Boilers module?

Most USCG exam modules, including Motor Plants and Auxiliary Boilers, require 70 percent to pass. Rules of the Road modules require 90 percent.

Q Are these the real USCG Motor Plants and Auxiliary Boilers exam questions?

Yes. They are the published U.S. Coast Guard questions, matched to the National Maritime Center's 2026 sample examinations. Answer any question to see the correct choice, the USCG reference and the illustration where the question uses one.

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