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Engine · 674 questions

Retired questions · General Subjects - USCG Exam Questions

These are retired questions the Coast Guard no longer draws exams from. They stay online for reference; the current questions are in General Subjects.

General engineering knowledge: watchkeeping, pumps and piping systems, hydraulics, instrumentation, and shipboard maintenance.

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 Retired questions · General Subjects questions

Questions 101–200 of 674 · page 2 of 7

  1. #331 What type of valve is shown in the illustration? GS-0047 illustration
  2. #332 The illustrated valve is known as a __________. GS-0056 illustration
  3. #335 The valve depicted in the illustration shown is a __________. GS-0055 illustration
  4. #343 Which of the illustrations depicts the correct procedure for applying pipe dope? GS-0046 illustration
  5. #349 While riding at anchor, the anchor chain should be secured by the __________.
  6. #350 The part of the anchor windlass that engages the anchor chain for lifting is called the __________.
  7. #352 A shot of anchor chain has a length of __________.
  8. #359 The hydraulic pump which would be mounted on the unit shown in the illustration, may begin to cavitate if __________. GS-0118 illustration
  9. #362 In the hydraulic anchor windlass system illustrated, if the power to the electric motor is on, but the wildcat turns slowly or not at all, even withou... illustration
  10. #363 In the hydraulic anchor windlass system illustrated, if the power to the electric motor is on, but the wildcat does not turn, the pressure developed o... illustration
  11. #364 In the hydraulic anchor windlass system illustrated, the main pressure relief valve opens as the load increases its strain on the system. The probable... illustration
  12. #372 If outside air at 80 degrees F and 70 percent relative humidity is conditioned, what will be the resulting dew point temperature of the air just befor... illustration
  13. #381 As shown in the illustrated LP centrifugal chiller high efficiency purge recovery unit piping schematic, what statement is true concerning the vacuum... illustration
  14. #382 Expansion tanks when used in a ships hot water heating system may be of the open or closed type. In a closed type system, what would be the normal tem...
  15. #385 Salt water ballast is to be discharged into the #6 port and starboard wing tanks. Which combination of valves, illustrated, must be opened, and which... illustration
  16. #386 In order to take suction on the lube oil drain tank cofferdam with the bilge pump shown in the illustration, how many suction side valves must be open... illustration
  17. #390 Which of the listed pumps, shown in the illustration, discharges directly to the fuel oil settling tanks of a diesel engine main propulsion plant? Ill... illustration
  18. #392 Fuel oil day tanks for diesel engines must be checked and cleaned at regular intervals in order to remove __________.
  19. #394 Standby or emergency diesel generator day tanks should always be kept full to reduce the possibility of __________.
  20. #396 The rudder torque capacity of the four ram steering gear illustrated is rated at 44,210,000 inch-pounds with one power unit in operation. If the four... illustration
  21. #398 If it is necessary to prevent the rudder from moving while a repair is made on the steering system using the illustrated actuator __________. GS-0116 illustration
  22. #399 In the illustrated schematic, the device used to replace the six-way valve, as found on many older type steering gears, is the component labeled as __... illustration
  23. #401 With respect to a lubricating oil's viscosity and the bearing loading characteristics at the points of lubrication, what statement is true?
  24. #402 Which statement concerning a lubricating oil's viscosity and bearing loading characteristics is true?
  25. #403 Greases used for most marine applications would have what National Lubricating Grease Institute (NLGI) grade?
  26. #406 When any low pressure distilling plant is operated with less than the designed vacuum, the __________.
  27. #407 In the production of freshwater from seawater through a process of heating and cooling, the cooling phase of production is usually called __________.
  28. #408 The process of boiling seawater in order to separate it into freshwater vapor and brine is usually defined as __________.
  29. #410 Which of the following statements is correct relative to distillation plant operation?
  30. #411 The efficiency of a flash type evaporator can be increased by __________.
  31. #412 Why would a flash type distilling unit be more efficient when operated in cooler seawater temperatures?
  32. #413 In a two-stage flash evaporator, the sea water feed temperature is increased as it passes through the __________.
  33. #414 Which of the following descriptions best identifies the operating principal of a flash- type evaporator?
  34. #415 In a flash evaporator, heated water under pressure is converted into vapor by suddenly __________.
  35. #416 What is the function of device "A" shown in the illustration? MO-0110 illustration
  36. #417 Diesel engine jacket water is used in the fresh water distillation process as the __________.
  37. #418 Which of the following represents the motivating power fluid used in conjunction with the ejector pumps on plate type evaporators?
  38. #419 The primary function of line 'J' shown in the illustration is to __________. MO-0110 illustration
  39. #420 The function of device "O" shown in the illustration is to __________. MO-0110 illustration
  40. #427 Why are heavy fuels not usually prone to the problems of microbiological infection?
  41. #428 Fuels as produced in a refinery are generally sterile; however, contamination can occur as fuels are __________.
  42. #429 Most type(s) of microbiological growths in fuel are __________.
  43. #430 The microbiological growths that affect fuel supplies can easily be transported from one location to another by __________.
  44. #431 An air compressor is equipped with an intercooler and an after cooler to __________.
  45. #432 The cylinders and intercoolers of most low pressure air compressor's are cooled by __________.
  46. #433 For any given volume of compressed air produced by a multistage air compressor, inter stage cooling will __________.
  47. #435 The usual method of unloading a low pressure air compressor at start-up is accomplished by __________.
  48. #436 Which of the listed devices would be installed at a control system air pressure reducing station?
  49. #439 When the compressed air reservoir is placed in line with an air compressor and is used as an after cooler, the reservoir must be __________.
  50. #440 The device shown in the illustration is commonly used to __________? GS-0120 illustration
  51. #441 One of the functions of the component labeled "E", shown in the illustration, is to __________. GS-0119 illustration
  52. #442 As demand on the device shown in the illustration fluctuates in the pressure range of 100 to 110 psi, the output of the unit is controlled by ________... illustration
  53. #443 Which of the following statements correctly describes the construction of the close coupled sanitary pump shown in the illustration? GS-0070 illustration
  54. #444 The device shown in the illustration is a __________. GS-0155 illustration
  55. #445 The diaphragm orifice labeled "H", as shown in the illustration is used as a/an __________. GS-0155 illustration
  56. #446 According to the illustration, which of the following statements represents the order of events required to occur for the device to close? GS-0155 illustration
  57. #447 The drains of lavatory sinks are fitted with P-type or S-type traps to __________.
  58. #448 A viscous film of oil collected between the valve face and seat of a low pressure reciprocating air compressor will __________.
  59. #450 Carbon deposits forming on the discharge valves of an air compressor are caused by oil deterioration under high pressure. The first step in reducing t...
  60. #452 Leaking valves in an air compressor can be a result of __________.
  61. #453 As routine maintenance, the bilge manifold valves are periodically removed and examined. Prior to resecuring the valve bonnets, the valve __________.
  62. #455 In order to take suction on the lube oil drain tank cofferdam with the bilge pump shown in the illustration, how many suction side valves must be open... illustration
  63. #462 Salt water ballast is to be discharged into the #6 port and starboard wing tanks. Which combination of valves, illustrated, must be opened, and which... illustration
  64. #465 With regard to a ballast system associated with a dry cargo ship, what is the primary purpose of the forepeak and aft peak tanks?
  65. #473 The device shown in the illustration is used to __________. GS-0029 illustration
  66. #477 Which of the listed valve types is typically used for suction and discharge valves on modern low pressure air compressors?
  67. #478 In order to distribute the side pressures over a wide area of the cylinder walls and liners, which of the listed types of pistons are used in modern l...
  68. #479 Which of the following compressors would be used for a cold-ship start-up of a ship's service diesel generator on a motor ship?
  69. #493 A viscous film of oil collected between the valve face and seat of a low pressure reciprocating air compressor will __________.
  70. #496 In a low pressure air compressor, the loss of volumetric efficiency normally results from __________.
  71. #502 Which of the listed central operating system types requires conversion of continuous analog signals from the sensing and transmitting devices to discr...
  72. #504 As shown in figure "B" in the illustrated block diagram of a central operating system configured for supervisory control, what is the function of the... illustration
  73. #505 As shown in figure "B" of the illustrated block diagram for a central operating system configured for supervisory control, what is becoming the indust... illustration
  74. #506 As shown in figure "A" of the illustrated block diagram of a central operating system configured for direct digital control, what does the output syst... illustration
  75. #507 As shown in figure "A" of the illustrated block diagram of a central operating system configured for direct digital control, what does the output syst... illustration
  76. #508 As shown in figure "A" of the illustrated block diagram of a central operating system configured for direct digital control, what does the output syst... illustration
  77. #509 As shown in figure "A" of the illustrated block diagram of a central operating system configured for direct digital control, what does the output syst... illustration
  78. #510 As shown in the illustrated block diagram for a distributed automation system, what statement is true concerning the area networks? EL-0096 illustration
  79. #511 As shown in the illustrated block diagram for a distributed automation system, what statement is true concerning the workstations labeled "LOS" associ... illustration
  80. #512 As shown in the illustrated block diagram for a distributed automation system, what statement is true concerning the data communication pathways label... illustration
  81. #513 As shown in the illustrated block diagram for a distributed automation system, what statement is true concerning the units labeled "WCU" in the accomm... illustration
  82. #523 Which of the following liquid level sensors would be most suitable for measuring the liquid level in a pressure vessel such a water-tube boiler steam...
  83. #526 Which of the following bearing types would be an example of a plain bearing which substitutes fluid friction for sliding friction?
  84. #528 What statement is true concerning the hydrostatic lubrication of plain bearings?
  85. #532 After adding grease to a ball bearing with a handheld grease gun, you should __________.
  86. #540 Regarding a freshwater generator of the reverse-osmosis type, what statement is true?
  87. #541 Reverse-osmosis freshwater generators usually feature multiple membrane modules, typically of the spiral-wound membrane type. How are these multiple m...
  88. #543 To ensure potable water of drinking quality, chemical treatment is required for reverse- osmosis freshwater generators. What is the purpose of chemica...
  89. #544 Regarding the operating principle of a reverse-osmosis type freshwater generator, what statement is true?
  90. #545 Regarding the high-pressure pump of a reverse-osmosis freshwater generator, what statement is true?
  91. #547 If the orifice in the loop seal of a flash evaporator were to become significantly enlarged through erosion, the __________.
  92. #549 A high reading is only indicated at the salinity cells labeled "W" and "6" shown in the illustration. This would be the probable result of __________.... illustration
  93. #553 A vacuum is initially created in a flash type distilling plant by __________.
  94. #554 Early models of the flash-type evaporators used a separate shell-and-tube heat exchanger as the air ejector condenser. More recent models use a combin...
  95. #558 Which of the following acids is preferable and most commonly used for scale removal from the heating surfaces of the jacket-water heated submerged-tub...
  96. #559 What occurs in the space labeled "G" of the device shown in the illustration? MO-0110 illustration
  97. #560 Which of the following conditions occurs in the section labeled "F" of the device shown in the illustration? MO-0110 illustration
  98. #561 What is the function of device "B" shown in the illustration? MO-0110 illustration
  99. #562 What is the function of device 'C' shown in the illustration? MO-0110 illustration
  100. #563 What is the function of item 'D' shown in the illustration? MO-0110 illustration

General Subjects questions: what to expect

Q How many General Subjects questions are in the Engine pool?

This retired set holds 674 General Subjects questions the Coast Guard no longer draws on exams. They stay online for reference; the current General Subjects module is the one to study.

Q What score do I need to pass the General Subjects module?

Most USCG exam modules, including General Subjects, require 70 percent to pass. Rules of the Road modules require 90 percent.

Q Are these the real USCG General Subjects 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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About the Engine question pool

The Engine pool holds the current U.S. Coast Guard questions for engineering credentials, from QMED ratings through DDE and Assistant Engineer up to Chief. Answer any question to see the correct choice instantly.