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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 1–100 of 674 · page 1 of 7

  1. #1 If both the shell-and-tube lube oil cooler and shell-and-tube jacket water cooler of a diesel engine are seawater cooled, what statement is true?
  2. #3 What type of flow pattern would be associated with a forced-convection finned-coil heat exchanger such as an air-cooled hydraulic oil cooler?
  3. #4 If a seawater-cooled shell-and-tube lubricating oil cooler has the seawater inlet and outlet connections on the opposite end water boxes, in terms of...
  4. #7 In the system illustrated, which of the following readings should be indicated on the pressure gage, if the load (x) is 8000 lbs (3632 kg) and the pis... illustration
  5. #11 The illustrated hydraulic pump graphic symbol is used to depict a __________. GS-0098 illustration
  6. #12 An arrow superimposed on a hydraulic graphic symbol at approximately 45°, as shown in the illustrated figures A, B, and C, indicates the component ___... illustration
  7. #13 Item "F" shown in the illustration represents two hydraulic pumps that are __________. GS-0103 illustration
  8. #14 The illustrated hydraulic pump graphic symbol is used to depict a/an __________. GS-0097 illustration
  9. #15 Item "B" shown in the illustrated hydraulic circuit is used to __________. GS-010 illustration
  10. #18 Of the hydraulic tubing fittings illustrated, the flared fitting for high pressure use is represented by figure __________. GS-010 illustration
  11. #20 The discharge capacity of the axial piston hydraulic pump, shown in the illustration, is __________. GS-0058 illustration
  12. #22 In a hydraulic system using the device illustrated, the high pressure return is provided by __________. GS-0118 illustration
  13. #24 Which of the following direct-reading pressure gauges is capable of measuring and displaying both positive and negative pressures?
  14. #25 Which of the following direct-reading pressure gauges is capable of measuring and displaying two pressures simultaneously?
  15. #26 Which of the following direct-reading pressure gauges is capable of measuring two pressures and displaying the difference between the two?
  16. #27 Which of the following direct-reading gauges would most likely be used in the application of a pump suction pressure gauge?
  17. #29 What type of direct reading thermometer works on the principle of thermal volumetric expansion of a liquid as the temperature rises and features a lin...
  18. #31 What is the application for a temperature measuring device known as a thermocouple pyrometer?
  19. #35 What statement best represents the characteristics of an ullage tape and bob for the purposes of taking a vented tank sounding?
  20. #37 When determining the level of a potable water hydro pneumatic header tank fitted with a tubular sight glass, what must be taken into consideration?
  21. #38 Which of the following measurements would be an example of total flow?
  22. #39 Which of the following measurements would be an example of flow rate?
  23. #40 Which of the following is an example of a flow meter which has associated with it a float for flow indication purposes?
  24. #45 If an engine lubricating oil's viscosity is given as 20W-50, what does this mean?
  25. #46 An air compressor is equipped with an intercooler and an after cooler to __________.
  26. #47 For any given volume of compressed air produced by a multistage air compressor, interstage cooling will __________.
  27. #48 The usual method of unloading a low pressure air compressor at start-up is accomplished by __________.
  28. #50 One of the functions of the component labeled "E", shown in the illustration, is to __________. GS-0119 illustration
  29. #51 One of the functions of the component labeled "E", shown in the illustration, is to __________. GS-0119 illustration
  30. #52 The components indicated as "7" and "8" as shown in the illustration, are known as the __________. GS-0153 illustration
  31. #53 The function of item "7" shown in the illustration is to __________. GS-0153 illustration
  32. #54 The line labeled "C", as shown in the illustration would be identified as the ______. GS-0175 illustration
  33. #55 The line labeled "G", as shown in the illustration would be identified as the ______. GS-0175 illustration
  34. #56 If item "1" shown in the illustration is a compound gage indicating zero psig and the water level in the bilges is one foot high, the unit is ________... illustration
  35. #64 Which factor determines the size of the ring dam for a fuel oil centrifugal purifier?
  36. #65 Which of the following sewage handling technologies would be associated with maintaining a culture of aerobic bacteria?
  37. #73 The control of exhaust temperature on a solid waste/sludge incinerator is critical. How this temperature is normally controlled?
  38. #74 How is solid trash and garbage generally admitted to a solid-waste incinerator on most ships?
  39. #75 In burning oily-waste sludge in a solid-waste/sludge incinerator, what statement is true?
  40. #79 What type of eye protection affords the best protection from dust and air-borne abrasives?
  41. #84 An example of an anti-friction bearing is a __________.
  42. #103 When installing CAUTION tags when performing a tag-out and lock-out procedure in preparation for accomplishing maintenance, what is the color of these...
  43. #104 Under what conditions is a DANGER tag installed at equipment control stations in preparation for performing maintenance or repairs?
  44. #105 What is an engine room bilge oily-water separator designed to do?
  45. #109 Referring to the illustration, note that the solenoid in line "C" is closed. The check valve in line "E" is open. The separator service pump is runnin... illustration
  46. #115 What is the primary purpose of a reach rod as used as a valve remote operator?
  47. #117 Suppose a remote valve operator is fitted with a gearbox. What is the purpose of the gearbox?
  48. #124 In certain circumstances, weldments are preheated before each pass to __________.
  49. #125 The root opening dimension shown in the illustration is used to indicate the __________. GS-0076 illustration
  50. #126 The welding process using an electric arc developed between a flux covered electrode and the metal being welded is known as __________.
  51. #127 The designation E7028-A1 is typically located on an arc welding electrode. Which of the listed letters and/or digits correctly identifies the welding...
  52. #128 Protective equipment to be used while carrying out oxy-acetylene welding should always include __________.
  53. #129 When welding with an oxy-acetylene outfit, __________.
  54. #130 Which of the following practices is considered to be safe for the handling and use of compressed gas cylinders?
  55. #131 When securing an oxy-acetylene cutting outfit for an extended period, you should close the __________.
  56. #132 Which of the following is true concerning the hose threads on compressed gas oxy- acetylene regulators and torches?
  57. #134 Solder used for joining metal surfaces should have a __________.
  58. #142 If the distances "A" and/or "B" as shown in the illustration are excessively increased, the tool will __________. GS-0085 illustration
  59. #151 The best tool to use to measure the number of threads per inch on a bolt is a __________.
  60. #152 The tool shown in the illustration is called a __________. GS-0072 illustration
  61. #153 The lathe tool shown as figure "U" in the illustration is commonly known as a/an __________. GS-0090 illustration
  62. #154 Which of the illustrated lathe tools would be used to produce a smooth finish cut for figure I? GS-0009 illustration
  63. #155 The lathe tool shown as figure "T" in the illustration is commonly known as a/an __________. GS-0090 illustration
  64. #156 The lathe tools shown as figure "M" in the illustration are commonly known as __________. GS-0090 illustration
  65. #157 Which single illustrated lathe tool could be used to turn down the stock in figure II? GS-0009 illustration
  66. #160 Which of the illustrated figures represents the use of a right hand roughing tool? GS-0090 illustration
  67. #161 The lathe tool shown as figure "R" in the illustration would best be used to __________. GS-0090 illustration
  68. #162 In machine shop practice, a center gage is used for checking the angle of __________.
  69. #163 Which lathe tool shown in the illustration would best be used on a work piece to perform a right hand facing operation? GS-0090 illustration
  70. #170 To determine the diameter of a small hole, which of the listed tools must be used with inside calipers to get an accurate reading?
  71. #171 To measure the diameter of a piece of round stock, you should use a __________.
  72. #173 The rotating part of a micrometer is the known as the __________.
  73. #175 A file handle is fitted to the file's __________.
  74. #183 When cutting sheet metal too thin to be held in your hand while using a hand held hacksaw, the sheet metal should be placed between two __________.
  75. #184 Which of the saws listed would be more suitable for cutting metal in tight quarters or flush to a surface where a hand held hacksaw frame could not be...
  76. #185 A saw blade produced of bonded tungsten-carbide particles and mounted in a hacksaw frame is known as a __________.
  77. #188 When using a hand held hacksaw the correct maximum rate of speed for cutting should be __________.
  78. #197 In order to tighten the bolts of a crankpin bearing to the exact tension specified by the engine manufacturer, you should use a/an __________.
  79. #209 Which of the screwdriver tips listed will fit screws with a four way or cross type slot?
  80. #210 Which type of screwdriver listed would have a 'Keystone' type vertical cross- sectional tip?
  81. #214 Which of the screwdrivers listed is fastest and most convenient when tightening many screws?
  82. #226 With respect to machine shop "taps and dies", a plug tap is correctly used for __________.
  83. #228 The number of screw threads per inch for a Standard National Coarse 1/2 inch bolt is __________.
  84. #229 Which of the figures illustrated would be LEAST desirable for use as a set screw? GS-0080 illustration
  85. #230 The device "F" shown in the illustration is best used to __________. GS-0080 illustration
  86. #231 The locking plates shown in the illustration are used in many marine applications. Which figure indicates the improper method for using these devices?... illustration
  87. #232 Which of the figures in illustration GS-0080 would be used in conjunction with figure "B" of the device shown in illustration GS-0124? GS-0080 illustration
  88. #234 What is the primary function of the devices shown in the illustration? GS-0156 illustration
  89. #235 When should the nut lock shown in the illustration, be replaced with standard lock washers or other similar devices used in the industry? GS-0156 illustration
  90. #236 Which of the devices shown in the illustration is designed for both inside and outside measurements? GS-0073 illustration
  91. #241 The purpose of the instrument illustrated is to __________. GS-0079 illustration
  92. #245 Which of the devices shown in the illustration should be used with a bridge gage? GS-0073 illustration
  93. #275 Which of the devices listed is used to maintain a snug interface between the rotating and stationary seal members shown in the illustration? GS-0071 illustration
  94. #276 Spring reinforced oil seals are generally installed with the tail or lip of the seal facing __________. GS-0152 illustration
  95. #306 The function of the section labeled "C" in the device illustrated is to provide a/an __________. GS-0075 illustration
  96. #309 What type of pump is shown in the illustration? GS-0144 illustration
  97. #322 The best gasket material to use in cargo fuel oil lines is __________.
  98. #323 Which of the gasket types listed is typically used on high pressure steam flange joints?
  99. #329 A gate valve installed in a piping system should be used __________.
  100. #330 Which of the following statements is true concerning the valve shown in the illustration. GS-0047 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.