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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 901–1,000 of 1,433 · page 10 of 15

  1. #1478 The component labeled "A" on the engine reversing device shown in the illustration, performs its function by transmitting _______. Illustration MO-012... illustration
  2. #1479 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...
  3. #1480 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
  4. #1481 Which of the following statements is true concerning the air starting valve, labeled "III", as shown in the illustration? Illustration MO-0046 illustration
  5. #1482 What type of engine lubrication oil filter system sends filtered oil directly to the high-pressure supply gallery?
  6. #1483 The device shown in the illustration is a __________. Illustration MO-0008 illustration
  7. #1484 The device shown in the illustration is classified as a/an __________. Illustration MO-0008 illustration
  8. #1485 The device shown in figure "A" of the illustration is used to __________. Illustration MO-0042 illustration
  9. #1486 The illustrated device is used to __________. Illustration MO-0050 illustration
  10. #1487 On a slow-speed, diesel-propelled vessel operating with constant slip, what is the effect on fuel consumption with an increase in shaft RPM?
  11. #1488 You are onboard a vessel with a slow-speed crosshead type engine. The fuel just received has a significantly lower sulfur content than the previous bu...
  12. #1489 The purpose of the interlocked three-way valve shown in the illustration is to __________. Illustration MO-0058 illustration
  13. #1490 Heavy fuel oil used in the system shown in the illustration, will have the lowest viscosity __________. Illustration MO-0058 illustration
  14. #1491 Which of the following precautions should be taken prior to starting the separator shown in the illustration? Illustration MO-0127 illustration
  15. #1492 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
  16. #1493 As Chief Engineer of a slow-speed diesel engine vessel equipped with an ALCAP fuel oil purification system. You note a definite increase in the rate a...
  17. #1494 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
  18. #1495 If item "F" begins leaking during operation, which of the following operating conditions will NOT occur? Illustration MO-0112 illustration
  19. #1496 While operating the fuel oil centrifuge shown in the illustration, the fuel oil is being continuously ejected with the sludge and the seal water. The... illustration
  20. #1497 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
  21. #1498 While operating the fuel oil centrifuge shown in the illustration, the bowl fails to open for sludge ejection. The probable cause is that __________.... illustration
  22. #1499 When reassembling the bowl of the centrifuge, shown in the illustration, the alignment mark on the locking ring passes the bowl cover mark in excess o... illustration
  23. #1500 According to the illustration, initial timing of fuel injection into the cylinder is controlled with the component that is identified as the letter __... illustration
  24. #1501 As shown in the illustration of the fuel injection pump, the function of the area designated as "L" is to __________. Illustration MO-0061 illustration
  25. #1502 In the illustration shown, moving the component labeled "E", further to the left, will result in _____. Illustration MO-0061 illustration
  26. #1503 Which type of diesel engine fuel nozzle is shown in the illustration? Illustration MO-0059 illustration
  27. #1504 Regarding the fuel injector shown in the illustration, the purpose of piece #38 is to __________. Illustration MO-0059 illustration
  28. #1505 The item labeled #16 in the illustration is a stack of spring washers. Their function is to __________. Illustration MO-0062 illustration
  29. #1506 In a two cycle diesel engine, a Roots-type blower is usually __________.
  30. #1507 Clearance volume scavenging in a turbocharged, four-stroke cycle diesel engine is accomplished __________.
  31. #1508 When installing the bearing cap on the device shown in the illustration, which of the precautions listed must be observed? Illustration MO-0121 illustration
  32. #1509 The gear drive, shown in the illustration, can have the backlash determined best by using a __________. Illustration MO-0091 illustration
  33. #1510 The boiler shown in the illustration would be classed as __________. Illustration MO-0064 illustration
  34. #1511 The gage glass on a coil-type auxiliary boiler is connected to the __________.
  35. #1512 In the water level electrode assembly, shown in the illustration, the feed pump should restart when the level of the water reaches the position indica... illustration
  36. #1513 As shown in the illustration, the component labeled "H" would be identified as a ________. Illustration MO-0128 illustration
  37. #1514 As shown in the illustration, the function of component "1" is to ________. Illustration MO-0128 illustration
  38. #1515 When checking for the presence of sulfite in the feedwater of an auxiliary boiler, you are in essence checking __________.
  39. #1516 The starter control valve in the hydraulic system shown in the illustration is malfunctioning. Before removing the valve, you must first __________. I... illustration
  40. #1517 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 __________...
  41. #1518 What is the best way of stopping an overspeeding diesel engine?
  42. #1519 Oil in a scavenging air space on a slow-speed diesel engine can be ignited by which of the following?
  43. #1520 Coast Guard Regulations (46 CFR Part 56) require steel tubing connections and fittings used with diesel fuel oil systems to be either flared or ______...
  44. #1521 A diesel engine operates erratically, overspeeds, and fails to restart when cranked at normal speed. Which of the following problems is the most likel...
  45. #1522 The pneumatic circuit shown in the illustration is part of a complex large low-speed engine control system. Which of the following statements describe... illustration
  46. #1523 If the input signal rises above the setpoint of '17A', shown in the illustration, but remains below the setpoint of '17B', the output from '22A' will... illustration
  47. #1524 The reversing cams of some four-stroke cycle diesel engines are brought into position by __________.
  48. #1525 As an engineer of a slow-speed diesel powered vessel, you note that the indicator card diagrams have a flat horizontal profile around TDC. To rectify...
  49. #1526 When analyzing indicator card diagrams you are calculating the work output from the cylinder by obtaining the area within the curve of what type of di...
  50. #1527 What will cause valve stem blow-by to the valve section shown in the illustration? illustration
  51. #1528 One experiences evidence of high temperature corrosion on diesel engine combustion space components. This is exhibited by 'wire drawing' marks on exha...
  52. #1529 The item labeled "T" as shown in figure 4 of the illustration is identified as the __________. illustration
  53. #1530 According to the illustration, which of the following is true? illustration
  54. #1531 The illustration shown describes a _______. illustration
  55. #1532 High-speed, multi-cylinder, diesel engines commonly use counterweights placed opposite to the crankpins to __________.
  56. #1533 What is one of the most significant factors to consider when calculating the amount of time required to change over to low Sulphur fuel on a slow-spee...
  57. #1534 High firing pressures and a low exhaust temperature in a diesel engine may result from __________.
  58. #1535 Which of the following statements describes the primary reason for the device shown in the illustration to be incorporated into the air start system? illustration
  59. #1536 While travelling in the tropics, the condensate draining from charge air receiver drain is flowing even though you have raised the inlet temperature t...
  60. #1537 The overspeed trip installed on most diesel engines will stop the engine by shutting off the _________.
  61. #1538 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
  62. #1539 Casing drains may be required on a waste heat boiler gas passage side __________.
  63. #1540 A burner producing black smoke in an automatic auxiliary boiler, would be caused by a/an __________.
  64. #1541 In accordance with 46 CFR Subchapter F, steel tubing connections and fittings used with diesel fuel oil systems are to be either flared or _________.
  65. #1542 Which of the terms listed below represents the speed at which the natural period of vibration of a shaft or other machine part is in synchronism with...
  66. #1543 If point #1 in the diagram shown is the beginning of gas compression, which of the cycles listed is being illustrated? illustration
  67. #1544 The action of which of the below components causes the intake ports of a two-stroke diesel engine to open and close?
  68. #1545 Where in the four-stroke cycle is cylinder #3 in the illustration? illustration
  69. #1546 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...
  70. #1547 Which of the following conditions would NOT be considered a valid reason for the diesel engine to operate in the area indicated by letter "B" shown in... illustration
  71. #1548 What is shown graphically on an indicator card or pressure-volume diagram?
  72. #1549 On the cylinder indicator diagram illustrated, what does the dashed line "L" indicate? illustration
  73. #1550 Which of the following creates the greatest turbulence in a diesel engine cylinder?
  74. #1551 In a diesel engine, fuel combustion begins just before top dead center. What then happens regarding combustion?
  75. #1552 What is the result of bearing "crush" as applied to diesel engine main bearings?
  76. #1553 Which diesel engine component connects the small end of the connecting rod to the piston?
  77. #1554 What is the term for the diesel engine component labeled "3", shown in the illustration? illustration
  78. #1555 How is the piston pin shown in the illustration classified? illustration
  79. #1556 Which of the following is a type of component found in diesel engines, described by terms such as barrel face, taper face, grooved, and chrome plated?
  80. #1557 Which component is used to convert the linear motion of a diesel engine piston into the rotary motion required to drive gears, propeller shafts, and g...
  81. #1558 In a modern two-stroke, slow-speed, internal combustion diesel engine, what is the part of the engine that houses the crankshaft?
  82. #1559 During diesel engine warm-up, which type of valve lash adjuster compensates for the change in length of the exhaust valve stem?
  83. #1560 In the illustrated diesel engine, what label indicates the exhaust manifold? illustration
  84. #1561 In the illustration, what is the line identified with the label "I" used for? illustration
  85. #1562 In the diesel engine illustration provided, which of the given choices indicate rocker arm assemblies? illustration
  86. #1563 Which letter represents the top deck (valve) cover of the engine shown in the illustration? illustration
  87. #1564 Which of the following procedures should be carried out when a large, low-speed, diesel engine is operated with one cylinder secured?
  88. #1565 Which of the following statements would apply when checking the valve clearance of the unit shown in the illustration? illustration
  89. #1566 The insertion of shims between the foot of a marine type connecting rod and a bearing box would result in __________.
  90. #1567 Excessive side clearance between a piston ring and its groove will cause the ring to __________.
  91. #1568 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... illustration
  92. #1569 The 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 cyl... illustration
  93. #1570 When starting an auxiliary diesel engine in preparation for operation, what parameter must be checked FIRST upon start-up to avoid immediate engine da...
  94. #1571 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...
  95. #1572 In an auxiliary diesel engine, one reason for knurling the piston skirt is to __________.
  96. #1573 White smoke issuing from the exhaust of an auxiliary diesel engine could mean __________.
  97. #1574 The turbocharged, four-stroke, diesel engines on your vessel are protected with dry-type air intake filters. The engines are fitted with dial-type res...
  98. #1575 An accumulator used in a hydraulic starting system is generally located between the __________.
  99. #1576 Starting a large low-speed propulsion diesel engine on diesel fuel during cold weather conditions will be made easier by __________.
  100. #1577 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...

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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