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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 701–800 of 1,433 · page 8 of 15

  1. #1245 When changing over from residual to distillate fuel on a slow-speed diesel main engine, what is a good guideline to follow regarding the change over?
  2. #1246 When changing over from residual to distillate fuel on a slow-speed diesel propelled vessel, you should limit the rate of temperature change of the fu...
  3. #1249 Your ship is equipped with ALCAP heavy fuel oil purifiers. The watchstander reports excessive water drained from the fuel oil service tank. Which comp...
  4. #1256 On a slow-speed diesel engine vessel equipped with an ALCAP fuel oil purification system, what would be a symptom of an opening solenoid valve leaking...
  5. #1263 High cylinder firing pressure, accompanied by low exhaust temperature, can result from __________.
  6. #1264 Heat damage to fuel injection nozzles can be prevented by avoiding __________.
  7. #1265 Faulty operation of diesel engine fuel injection nozzles can be a direct cause of __________.
  8. #1266 Surface irregularities, such as erosion and pitting on injection pump plungers, will __________.
  9. #1267 While examining a used fuel injection nozzle(s), one finds worn and enlarged orifices. What does this indicate about that cylinder's performance prior...
  10. #1268 Injection lag in a diesel engine may be caused by __________.
  11. #1269 In the common rail system, excessive pressure in the header may be caused by __________.
  12. #1270 The diesel engine shown in the illustration, is provided with an auxiliary blower to __________. Illustration MO-0003 illustration
  13. #1273 A loop or cross scavenged engine utilizes the motion of its pistons and a turbocharger to provide scavenging air. Which of the listed mechanical desig...
  14. #1274 Maintaining the lowest possible scavenging air temperature at all times is not recommended due to the possibility of the __________.
  15. #1277 Which of the listed problems will happen when the water level of a fire-tube type auxiliary boiler approaches the crown sheet?
  16. #1278 Which of the following statements concerning fire-tube boilers is correct?
  17. #1279 Why should the main steam stop valve of an auxiliary boiler be eased off its seat and then gently closed before lighting off?
  18. #1283 An exhaust gas bypass is installed on a waste heat boiler in order to __________.
  19. #1284 Waste heat boilers may be equipped with vents on the feedwater heater heads to __________.
  20. #1286 As shown in the illustration, the component labeled 'E' would be identified as a ______. Illustration MO-0128 illustration
  21. #1287 In general, diesel engine waste heat boiler construction is usually of the _________.
  22. #1295 A propulsion engine, using the speed control circuit shown in the illustration, fails to function at speeds lower than the low end of the critical spe... illustration
  23. #1299 The circuit shown in the illustration represents a/an __________. Illustration MO-0115 illustration
  24. #1300 Which of the following statements describes the function of the device labeled "C" shown in the illustration? Illustration MO-0115 illustration
  25. #1302 A schematic diagram of an isochronous hydraulic governor is shown in the illustration. When the load is removed the speed increases, and the _________... illustration
  26. #1303 The governor for an emergency diesel generator is shown in the illustration. When a large change in load results in a change in engine speed, which of... illustration
  27. #1304 The process of scavenging a two-stroke cycle diesel engine serves to __________.
  28. #1305 Aftercooling of a turbocharged diesel engine will result in __________.
  29. #1306 Forcing the exhaust gases from the cylinder of an operating two-cycle diesel engine with the aid of a blower is known as __________.
  30. #1307 What statement is true concerning the charge air system of a modern turbocharged slow-speed two-stroke cycle diesel engine?
  31. #1308 During the valve overlap period, the exhaust pressure of a turbocharged, four-stroke cycle diesel engine must be less than the intake manifold pressur...
  32. #1309 A two-stroke cycle diesel engine requires less starting air than a four-stroke cycle diesel engine, of equal displacement, because the two-stroke cycl...
  33. #1310 Irregular engine speed in a diesel-generator can be caused by __________.
  34. #1311 A modern centrifuge, similar to the device shown in the illustration, is opened for periodic cleaning. The most common cause of operating failure afte... illustration
  35. #1312 Casing drains may be required on a waste heat boiler gas passage to __________.
  36. #1313 Air motors used for starting some auxiliary diesel engines are generally the type known as __________.
  37. #1314 The pinion of an auxiliary diesel-electric starting motor normally engages the flywheel ring gear by means of a/an __________.
  38. #1315 During the starting of a diesel engine, compression gases are prevented from backing into the air starting system, shown in the illustration, by the _... illustration
  39. #1316 When an air started, four-stroke cycle diesel engine is being cranked over, the starting air is admitted to each cylinder during the beginning of its...
  40. #1317 The diesel engine wrist pin in the illustration is indicated by the component labeled __________. Illustration MO-0122 illustration
  41. #1318 In a diesel engine closed fresh water cooling system employing a radiator, proper water temperature can be obtained by __________.
  42. #1319 What is the function of the aftercoolers installed in the diesel engine air intake system?
  43. #1320 The power output of a turbocharged diesel engine will drop if the cooling water flow through the aftercooler is interrupted because the __________.
  44. #1321 A sudden power loss from a turbocharged and aftercooled diesel engine is an indication of a/an __________.
  45. #1322 The highest pressure in any closed diesel engine fresh water cooling system is at the __________.
  46. #1323 Cooling water pumps driven by direct reversing diesel engines are usually __________.
  47. #1324 A closed fresh water cooling system is commonly used with marine diesel engines because the __________.
  48. #1325 The lube oil strainer shown in the illustration is used on the reduction gear of a mid-size diesel engine. The strainer elements consist of __________... illustration
  49. #1326 Where would a coarse screen wire mesh strainer normally be found on a diesel engine lubrication system?
  50. #1327 Lube oil cannot be efficiently filtered if it’s __________.
  51. #1328 Valve '1', as shown in the illustration, should be operated when __________. Illustration MO-0077 illustration
  52. #1329 Which of the following methods is normally used to lubricate bearings in a small high-speed diesel engine?
  53. #1330 The illustrated device is operated directly by __________. Illustration MO-0041 illustration
  54. #1331 Movement of the pump control rack in a fuel injection system using individual plunger-type pumps __________.
  55. #1332 Sacrificial zinc anodes are used on the salt water side of diesel engine heat exchangers to __________.
  56. #1333 In a diesel engine jacket water cooler, with sea water cooling the fresh water, the __________.
  57. #1334 What is the average piston speed of a five cylinder low-speed engine with a bore of 29.5 inches (75 cm), a stroke of 63 inches (160 cm), and a rated s...
  58. #1335 A six cylinder, two-stroke cycle diesel engine is 83% efficient and has a cylinder constant of 0.998 while operating with a mean effective pressure of...
  59. #1336 An eight cylinder, four-stroke cycle, single acting diesel engine has a 650 mm bore and a 1400 mm stroke. What will be the developed indicated metric...
  60. #1337 The speed of the camshaft in a two-stroke cycle diesel engine, running at 950 RPM, is __________.
  61. #1338 If the piston stroke in a four-stroke cycle diesel engine is 10 1/2 inches and the speed of rotation of the crankshaft is 720 RPM, what is the average...
  62. #1339 A four cylinder, four-stroke cycle, single acting diesel engine has a 740 mm bore and a 1500 mm stroke. What indicated power will be developed if the...
  63. #1340 Which of the following conditions will cause the engine to operate in area "A" of the diagram shown in the illustration? Illustration MO-0126 illustration
  64. #1341 The indicator card shown in the illustration is produced with a/an __________. Illustration MO-0108 illustration
  65. #1342 In the pressure-volume diagram, shown in the illustration, what occurs between points "e" and "f"? Illustration MO-0035 illustration
  66. #1343 Which of the following relationships exist between the temperature developed in a combustion space, and the compression ratio of the engine?
  67. #1344 The component shown in the illustration would be identified as a/an __________. Illustration MO-0097 illustration
  68. #1345 The component identified as item No.15 is used to __________. Illustration MO-0016 illustration
  69. #1346 In the large slow-speed main propulsion diesel engine shown in the illustration, the part labeled "G" is the __________. Illustration MO-0003 illustration
  70. #1347 Regarding the fuel injector shown in the illustration, the purpose of piece #38 is to __________. Illustration MO-0059 illustration
  71. #1348 Which type of diesel engine fuel nozzle is shown in the illustration? Illustration MO-0059 illustration
  72. #1349 A main propulsion diesel engine is normally shutdown by __________.
  73. #1350 The overspeeding of the diesel engine driving an electric generator could cause __________.
  74. #1351 The pneumatic circuit shown in the illustration is part of a control system used with large low-speed diesel engines. The arrangement may be used to c... illustration
  75. #1352 The 3-position, 4-way directional control valve with a 30 bar output at "ee" as shown in the illustration (MO-0116) is a blocking valve associated wit... illustration
  76. #1353 Which of the types of reduction gearing listed is best suited for medium-speed main propulsion units?
  77. #1354 How is lubrication provided to the device shown in the illustration? Illustration MO-0120 illustration
  78. #1355 What prevents the thrust bearing blocks shown in the illustration from rotating within the housing? Illustration MO-0120 illustration
  79. #1356 Which area of the indicator diagram illustrated, indicates the ignition delay period in a diesel engine cylinder? Illustration MO-0033 illustration
  80. #1357 On the cylinder indicator diagram illustrated, the maximum rise in pressure occurs during the period labeled as ______. Illustration MO-0033 illustration
  81. #1358 In the pressure-volume diagram shown in the illustration, the atmospheric pressure line is indicated by line __________. Illustration MO-0035 illustration
  82. #1359 Which of the indicator diagrams illustrated depicts the condition that should be corrected by retarding only the timing? Illustration MO-0029 illustration
  83. #1360 Which of the indicator diagrams illustrated indicates the condition that should be corrected by retarding the timing, and the fitting of thicker shims... illustration
  84. #1361 In the slow-speed diesel engine shown in the illustration, the part labeled "E" is the __________. Illustration MO-0003 illustration
  85. #1362 Which letter represents the scavenging air system non-return valve in the illustration? Illustration MO-0003 illustration
  86. #1363 In the diesel engine shown in the illustration, the purpose of the part labeled "P" is to __________. Illustration MO-0003 illustration
  87. #1364 The part labeled "X" shown in the illustration is a __________. Illustration MO-0003 illustration
  88. #1365 Which of the following processes is indicated by the flow arrows shown in the illustration? Illustration MO-0026 illustration
  89. #1366 Which of the listed design features is most common with a two-stroke cycle, low-speed main propulsion diesel engine?
  90. #1367 The fuel injector for the diesel engine shown in the illustration, is identified as _________. Illustration MO-0122 illustration
  91. #1368 Which letter represents the top deck (valve) cover of the engine shown in the illustration? Illustration MO-0122 illustration
  92. #1369 Device 'E' shown in the illustration is known as the __________. Illustration MO-0122 illustration
  93. #1370 Component 'U' of the diesel engine shown in the illustration is called the __________. Illustration MO-0122 illustration
  94. #1371 The diesel engine wrist pin in the illustration is indicated by the component labeled __________. Illustration MO-0122 illustration
  95. #1372 Item '17' in the illustration is the dipstick. When should the length of the dipstick be changed? Illustration MO-0122 illustration
  96. #1373 In a two-stroke cycle, opposed-piston, diesel engine, one crankshaft operates several crank angles in advance of the other crankshaft to __________.
  97. #1374 The water inlet manifold for the diesel engine shown in the illustration is represented by the letter or number __________. Illustration MO-0122 illustration
  98. #1375 The diesel engine component labeled "3", shown in the illustration is called the __________. Illustration MO-0122 illustration
  99. #1376 The diesel engine connecting rods shown in the illustration are distinctively named __________. Illustration MO-0122 illustration
  100. #1377 Which of the following represents the diesel engine camshaft shown in the illustration and its relative rotating speed? Illustration MO-0122 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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