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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 801–900 of 1,433 · page 9 of 15

  1. #1378 The rocker arms of the diesel engine shown in the illustration are indicated by __________. Illustration MO-0122 illustration
  2. #1379 The injector rack of the diesel engine shown in the illustration is indicated by the component labeled __________. Illustration MO-0122 illustration
  3. #1380 Which letter represents the exhaust gas exit point for the diesel engine shown in the illustration? Illustration MO-0122 illustration
  4. #1381 The main lube oil manifold, for the diesel engine shown in the illustration, is represented by the letter or number __________. Illustration MO-0122 illustration
  5. #1382 The diesel engine component labeled "1", shown in the illustration is called a/an __________. Illustration MO-0122 illustration
  6. #1383 The inlet valves for the diesel engine shown in the illustration are indicated by the letter or number __________. Illustration MO-0122 illustration
  7. #1384 The diesel engine component labeled "5", shown in the illustration is known as the __________. Illustration MO-0122 illustration
  8. #1385 What is the function of component "13" shown in the illustration? Illustration MO-0122 illustration
  9. #1386 Which of the components listed is only found in an opposed-piston engine?
  10. #1387 The component labeled "A" on the engine reversing device shown in the illustration, performs its function by transmitting _______. Illustration MO-012... illustration
  11. #1388 The pinion of an auxiliary diesel-electric starting motor normally engages the flywheel ring gear by means of a/an __________.
  12. #1389 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
  13. #1390 Which of the following statements is true concerning the air starting valve, labeled "III", as shown in the illustration? Illustration MO-0046 illustration
  14. #1391 The pilot valves in an air pilot starting system for a two-stroke cycle, direct reversing, main propulsion diesel engine are operated by either a port...
  15. #1392 A six-cylinder, four-stroke cycle diesel engine is fitted with a rotary distributor type air starting system. The speed of the rotating distributor di...
  16. #1393 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...
  17. #1394 In order to reverse the rotation of a two-stroke cycle loop scavenged, direct reversing, propulsion diesel engine, the cam positions must be changed f...
  18. #1395 Starting a large low-speed propulsion diesel engine on diesel fuel during cold weather conditions will be made easier by __________.
  19. #1396 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...
  20. #1397 Where would a coarse screen wire mesh strainer normally be found on a diesel engine lubrication system?
  21. #1398 Wrist pin bearings are difficult to lubricate because of their oscillating motion and __________.
  22. #1399 The upper piston rings in large, slow-speed, two-stroke cycle diesel engines are most effectively lubricated by oil __________.
  23. #1400 Proper lubrication of the main bearings is more easily obtained in a single acting four-stroke cycle diesel engine than in a single acting two-stroke...
  24. #1401 What type of engine lubrication oil filter system sends filtered oil directly to the high-pressure supply gallery?
  25. #1402 In a bypass type lubrication system for a diesel engine, the dirty oil line to the centrifuge should be taken from the __________.
  26. #1403 The component labeled as part No.20 in the illustration is used to __________. Illustration MO-0050 illustration
  27. #1404 Precombustion chambers and energy cells in high-speed, small bore diesel engines all serve to increase ________.
  28. #1405 If a particular liquid has a specific gravity of 0.96 kg/dm3 at 77°F, what will be the specific gravity of the liquid, as determined from the grap... illustration
  29. #1406 To minimize corrosion, fuel oil strainer disks, spacers and scraper blades are made of __________.
  30. #1407 Which of the following precautions should be taken prior to starting the separator shown in the illustration? Illustration MO-0127 illustration
  31. #1408 Which of the labeled figures illustrated, represents the correct alignment mark relationships of a properly reassembled centrifuge bowl? Illustration... illustration
  32. #1409 In the device shown in the illustration, the component lettered "A" is the __________. Illustration MO-0012 illustration
  33. #1410 How is oil supplied to the device shown in the illustration? Illustration MO-0127 illustration
  34. #1411 The system shown in the illustration utilizes a water transducer which is __________. Illustration MO-0127 illustration
  35. #1412 Which of the listed types of gasket material should be used on high-pressure fuel oil lines on a diesel engine?
  36. #1413 Heavy fuel oil used in the system shown in the illustration will have the lowest viscosity __________. Illustration MO-0058 illustration
  37. #1414 Using the graph shown in the illustration, the oil being separated has a specific gravity of 0.87 kg/dm3 at 72.5°C. What will be the specific grav... illustration
  38. #1415 From the graph shown in the illustration, if the separating temperature required is to be 167°F, and the specific gravity of the oil is 0.98 kg/dm... illustration
  39. #1416 From the graph shown in the illustration, determine the size of the regulating ring required for the proper operation of the fuel oil centrifuge if th... illustration
  40. #1417 What is the function of the aftercoolers installed in the diesel engine air intake system?
  41. #1418 The outlet from an expansion tank of a closed fresh water cooling system should be piped to the __________.
  42. #1419 Which set of valves will be opened intentionally to remove heat from the main engine jacket cooling water system shown in the illustration? Illustrati... illustration
  43. #1420 What is the function of the device labeled "3" shown in the illustration? Illustration MO-0111 illustration
  44. #1421 What is the function of the item "7" shown in the illustration? Illustration MO-0111 illustration
  45. #1422 The operation of the lube oil cooler, shown in the illustration as item No.4, will be characterized by which of the following statements? Illustration... illustration
  46. #1423 What is the primary function of item '15' shown in the illustration? Illustration MO-0111 illustration
  47. #1424 Which of the following statements represents the two major functions provided by the item labeled "20" shown in the illustration? Illustration MO-0111 illustration
  48. #1425 The items labeled "21" and "22", shown in the illustration are used to remove __________. Illustration MO-0111 illustration
  49. #1426 Which of the following statements describes what will occur to the volume of water vapor as it is exposed to the lower temperatures existing in the de... illustration
  50. #1427 Device "27" shown in the illustration is used to __________. Illustration MO-0111 illustration
  51. #1428 Which of the valve arrangements listed would be correct for operating the distillation plant shown in the illustration? Illustration MO-0111 illustration
  52. #1429 Excess brine accumulated in the distiller, shown in the illustration, is removed during normal operation by __________. Illustration MO-0111 illustration
  53. #1430 During operation which device listed removes air and non-condensable gases from the unit shown in the illustration? Illustration MO-0111 illustration
  54. #1431 The graphic dotted line between items "27", "12", "9", and "20", shown in the illustration, is used to indicate the use of __________. Illustration MO... illustration
  55. #1432 Excluding line losses, how many distinct pressure drops will occur as sea water flows through all the heat exchangers in the cooling system shown in t... illustration
  56. #1433 Which device is used to prevent overpressurization of the illustrated distiller? Illustration MO-0111 illustration
  57. #1434 Where is the latent heat obtained to create vapor from the feedwater in the illustrated distiller? Illustration MO-0111 illustration
  58. #1435 Which of the following statements describes the approximate relation between the feedwater entering the unit shown in the illustration and brine being... illustration
  59. #1436 Cooling water pumps driven by direct reversing diesel engines are usually __________.
  60. #1437 When would the available energy of the exhaust gases of a two-stroke cycle diesel engine be insufficient to drive an exhaust gas turbocharger, resulti...
  61. #1438 Aftercooling of a turbocharged diesel engine will result in __________.
  62. #1439 The process of scavenging a two-stroke cycle diesel engine serves to __________.
  63. #1440 The average exhaust temperature of a two-stroke cycle diesel engine with a turbine-driven supercharger is lower than a similar four-stroke cycle diese...
  64. #1441 During the valve overlap period, the exhaust pressure of a turbocharged, four-stroke cycle diesel engine must be less than the intake manifold pressur...
  65. #1442 Air scavenging of the cylinder shown in the illustration begins between figures __________. Illustration MO-0025 illustration
  66. #1443 Large, two-stroke cycle, main propulsion, diesel engine cylinders can be successfully pressure charged during normal operation, by using the _________...
  67. #1444 Which of the turbocharging methods listed directs the exhaust gases to the turbine at fairly uniform velocity and pressure?
  68. #1445 Which of the turbocharging systems listed operates with the least average back pressure in the exhaust manifold?
  69. #1446 In a two-stroke cycle diesel engine, a Roots-type blower is usually __________.
  70. #1447 Clearance volume scavenging in a turbocharged, four-stroke cycle diesel engine is accomplished __________.
  71. #1448 Which of the following statements is correct regarding a turbocharged four-stroke cycle diesel-generator?
  72. #1449 If governor Item No.19 in the illustration were to break on a diesel engine operating under full load, the engine RPM will __________. Illustration MO... illustration
  73. #1450 In the illustrated auxiliary diesel engine governor, decreasing the distance between piece No.6 and piece No.10 will affect the engine by __________.... illustration
  74. #1451 What is the best way of stopping an overspeeding diesel engine?
  75. #1452 An auxiliary diesel-generator continues to run after you try to shut down. Your next course of action should be to _________.
  76. #1453 When installing the bearing cap on the device shown in the illustration, which of the precautions listed must be observed? Illustration MO-0121 illustration
  77. #1454 A diesel-generator governor is hunting. After changing the oil, the governor is flushed and the compensation needle valve is adjusted, but the hunting...
  78. #1455 Sacrificial zinc anodes are used on the salt water side of diesel engine heat exchangers to __________.
  79. #1456 Which of the following statements describes what will occur if the annular spaces, indicated by the letter "K" of the device shown in the illustration... illustration
  80. #1457 As shown in the illustration, which of the following conditions would be responsible for a "low-pressure in oil outlet" alarm to be indicated? Illustr... illustration
  81. #1458 The thrust bearing shown in the illustration has over eight years of ahead running time. Measurements show "i1" is 4 mm and "i2" is 1 mm. Which of the... illustration
  82. #1459 A diesel engine operates erratically, overspeeds, and fails to restart when cranked at normal speed. Which of the following problems is the most likel...
  83. #1460 Antifreeze solutions containing ethylene glycol should not be mixed with corrosion protection oils, as the resultant mixture __________.
  84. #1461 The power output of a turbocharged diesel engine will drop if the cooling water flow through the aftercooler is interrupted because the __________.
  85. #1462 The instrument shown in the illustration would be used on a diesel engine to __________. Illustration MO-0031 illustration
  86. #1463 Excessive wear at part No.11, shown in the illustration would result in __________. Illustration MO-0027 illustration
  87. #1464 An immediate repair is required if a leak occurs in the high-pressure fuel piping between the injection pump and fuel nozzle because of the __________...
  88. #1465 Which construction detail is apparent in the connecting rod and piston assembly shown in the illustration? Illustration MO-0011 illustration
  89. #1466 Which of the following statements is correct concerning the connecting rod and piston assembly shown in the illustration? Illustration MO-0011 illustration
  90. #1467 Which of the conditions listed could cause the cylinder relief valves on a large, low-speed, propulsion diesel engine to lift?
  91. #1468 Which of the following procedures should be carried out to permit the continued operation of a crosshead engine with a leaky aftercooler?
  92. #1469 When inspecting pistons, liners, and rings of a large two-stroke cycle diesel engine through the cylinder ports, a wet piston crown would indicate a _...
  93. #1470 Telescopic pipes which are attached to water cooled pistons of large, slow-speed, main propulsion diesel engines are designed to ________.
  94. #1471 Which of the listed design features is most common with a two-stroke cycle, low-speed main propulsion diesel engine?
  95. #1472 The piston rod scraper box incorporated in a two-stroke cycle, crosshead diesel engine serves to __________.
  96. #1473 There are two glands provided where the piston rod exits the cylinder shown in the illustration. The purpose of the top gland is to __________. Illust... illustration
  97. #1474 In a four-stroke cycle diesel engine, badly worn intake valve guides can cause excessive __________.
  98. #1475 The part labeled "G", as shown in the illustration, is a __________. Illustration MO-0040 illustration
  99. #1476 In the auxiliary diesel engine, shown in the illustration, the __________. Illustration MO-0006 illustration
  100. #1477 The cylinders labeled "B" and "C" in the illustration are used to __________. Illustration MO-0125 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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