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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 201–300 of 674 · page 3 of 7

  1. #564 For the successful operation of a reverse-osmosis freshwater generator, the setting of the brine back pressure regulator is critical. What statement r...
  2. #565 If a reverse-osmosis freshwater generating unit has a high salinity alarm associated with the freshwater outlet, what should be done?
  3. #566 What is the BEST indication that the pre-treatment filter (or filters) of a reverse- osmosis freshwater generator must be serviced by cleaning or repl...
  4. #568 What is the BEST indication that the membrane modules of a reverse-osmosis freshwater generator must be serviced by flushing or cleaning?
  5. #569 Under what conditions would the pre-treatment capabilities of a reverse-osmosis freshwater generator MOST likely be overloaded, and as a result, these...
  6. #570 What is the BEST indication that the membrane module is damaged and is no longer semi-permeable and allowing the solute to pass through?
  7. #571 When a reverse-osmosis freshwater generator is shutdown, what must be accomplished?
  8. #573 Failure to establish sufficient vacuum when starting up the unit shown in the illustration may be the result of __________. MO-0110 illustration
  9. #574 Which of the following conditions can cause high salinity of the distillate due to sea water leakage in the illustrated device. MO-0110 illustration
  10. #575 When tightening the plate type heat exchangers shown in the illustration, care must be taken to __________. MO-0110 illustration
  11. #577 Which of the following freshwater generators has an operating principle that requires it to run under a substantially positive pressure?
  12. #578 In which of the following freshwater generators would an air ejector be unnecessary?
  13. #579 Which of the freshwater generators listed below requires a source of heat and evaporates sea water at a location other than a heat exchanger surface?
  14. #580 Other than taking a scale thickness through a zinc plug opening of the water box of a feed water heater of a flash evaporator, what would be the BEST...
  15. #586 What occurs within the tubes of the device labeled "23" shown in the illustration? Illustration MO-0111 illustration
  16. #587 The operation of the lube oil cooler, shown in the illustration as item #4, will be characterized by which of the following statements? Illustration M... illustration
  17. #588 What is a function of the device labeled "1" shown in the illustration? MO-0111 illustration
  18. #601 Suppose a prime mover rotates at a steady speed of 900 rpm at rated full load and rotates at a steady speed of 1000 rpm at no load. Assuming that no a...
  19. #605 Which term represents the how rapidly a speed control governor will complete a corrective action as the result of a load change?
  20. #608 What is statement is true concerning the term "isochronous" as it applies to prime mover speed control governors?
  21. #610 With regard to the relative flow patterns through the tubes and the shell of shell-and- tube heat exchangers, what statement is true?
  22. #612 If a heat exchanger is designed to cool lubricating oil using sea water as a cooling medium, what statement is true?
  23. #613 If a heat exchanger is designed to heat heavy fuel oil using steam as a heating medium, what statement is true?
  24. #614 If a heat exchanger is designed to evaporate sea water using diesel engine jacket water as an evaporating medium, what statement is true?
  25. #616 What type of flow pattern would be associated with a forced-convection finned-coil heat exchanger such as an air-cooled hydraulic oil cooler?
  26. #617 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...
  27. #618 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?
  28. #619 Which of the following provisions for thermal expansion for shell-and-tube heat exchangers only requires a single tube sheet located at one end?
  29. #620 Which of the following provisions for thermal expansion for shell-and-tube heat exchangers has a tube arrangement featuring a "tube-within-a-tube"?
  30. #621 In a shell-and-tube heat exchanger, which of the following tube types would be LEAST susceptible to tube-side fouling?
  31. #622 For a given shell diameter and tube sizes for a shell-and-tube heat exchanger, which tube pitch pattern would be the most compact design allowing for...
  32. #623 For a shell-and-tube heat exchanger, which tube pitch pattern would feature "see- through" lanes and would most easily allow external mechanical clean...
  33. #624 Concerning the baffles of a shell-and-tube heat exchanger, what statement is true?
  34. #626 What prevents the two fluids in a plate type heat exchanger from coming into direct contact with each other and mixing?
  35. #627 With regard to the flow patterns associated with plate type heat exchangers, which flow pattern is able to achieve counter-flow on opposite sides of e...
  36. #628 What is the most common arrangement for a compact heat exchanger such as that used on an air conditioning cooling coil located in a ventilation supply...
  37. #629 When placing a shell-and-tube heat exchanger with a removable tube bundle such as a bayonet-tube heavy fuel oil service heater into service, to avoid...
  38. #630 When placing a shell-and-tube heat exchanger with a removable tube bundle such as a bayonet-tube heavy fuel oil service heater into service, to preven...
  39. #631 When taking a shell-and-tube heat exchanger with a removable tube bundle such as a bayonet-tube type heavy fuel oil service heater out of service, to...
  40. #634 When placing a shell-and-tube heat exchanger such as a jacket water cooler into service, to insure optimal heat transfer what statement represents the...
  41. #635 When securing a seawater-cooled shell-and-tube heat exchanger for an extended period of time, what statement represents the recommended operating proc...
  42. #636 When shifting heat exchangers such as main engine lube-oil coolers, what statement represents the recommended operating procedure if the shift is to o...
  43. #637 Suppose a diesel engine is fitted with seawater-cooled lube oil and jacket water coolers. What statement is true concerning the system operating press...
  44. #638 What is the primary indication of fouling of a heat exchanger?
  45. #639 For soft scale deposits on the inside of the tubes of a seawater-cooled shell-and-tube heat exchanger, what is typically the preferred method of clean...
  46. #640 For stubborn, hard scale deposits on the inside of the tubes of a seawater-cooled shell-and-tube heat exchanger, what is typically the preferred metho...
  47. #641 For removal of sludge from in the inside of the shell of a fuel oil heater or lube oil cooler, what is typically the preferred method of cleaning?
  48. #642 What would be the most likely indication that a plate type jacket water cooler had an internal leak permitting mixing of the two fluids?
  49. #643 Which saltwater-cooled heat exchanger arrangement and location would be MOST problematic in terms of keeping the seawater side filled?
  50. #644 Which saltwater-cooled heat exchanger arrangement and location would be the LEAST likely to become air-bound on the seawater side?
  51. #645 How may a suspected tube leak on a shell-and-tube jacket water cooler most easily be located?
  52. #646 What would be the most likely indication that a shell-and-tube lube oil cooler had in internal leak permitting mixing of the two fluids?
  53. #647 Besides a visual inspection upon disassembly, what method can be used to check for suspected leakage through a heat transfer plate of a plate type hea...
  54. #648 If a fluorescent dye penetrant and ultra-violet light are used for leak detection on a heat exchanger, what would be the indication of a confirmed lea...
  55. #653 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
  56. #654 The illustrated hydraulic pump graphic symbol is used to depict a/an __________. GS-0097 illustration
  57. #655 Item "B" shown in the illustrated hydraulic circuit is used to __________. GS-0103 illustration
  58. #656 Item "E" shown in the illustration is used in the hydraulic circuit as __________. GS-0103 illustration
  59. #658 The hydraulic tubing installation shown as figure "D" is INCORRECT and will probably leak when in operation because the tubing __________. GS-0065 illustration
  60. #660 Of the hydraulic tubing fittings illustrated, the flared fitting for high pressure use is represented by figure __________. GS-0100 illustration
  61. #662 Which of the following components listed is shown in the illustration? GS-0041 illustration
  62. #666 The device shown in the illustration is commonly known as a/an __________. GS-0071 illustration
  63. #668 The device illustrated would be best used as a __________. GS-0058 illustration
  64. #669 If the flow rate and pressurized oil from a variable capacity pump were supplied to the device illustrated, the __________. GS-0058 illustration
  65. #674 A hydraulic system flow-control circuit is shown in the illustration and is known as a __________. GS-0105 illustration
  66. #677 Which of the following statements will be true if the position of the manual control lever, shown in the illustration, remains unchanged after the pum... illustration
  67. #678 A variable displacement pump is fitted with the illustrated device, the discharge flow rate will be reduced as described by which of the following sta... illustration
  68. #679 One function of a replenishing pump installed in many pressure-closed hydraulic systems, is to supply fluid flow to __________.
  69. #680 Compensated flow control, or constant flow valves are used in hydraulic systems to __________.
  70. #681 Which of the valves listed is NOT considered to be a hydraulic system directional control valve?
  71. #682 The counter balance valve (5) in the winch circuit shown in the illustration ________. GS-0161 illustration
  72. #684 The purpose of a restrictor valve, as it is used in a hydraulic hatch cover system, is to __________.
  73. #687 Which of the statements is true concerning the illustrated hydraulic circuit when the directional control valve is centered? GS-0105 illustration
  74. #688 If solenoid "A" illustrated is energized, the __________. GS-0041 illustration
  75. #697 In a hydraulic system using the device illustrated, the high pressure return is provided by __________. GS-0118 illustration
  76. #707 In which lubrication application is a detergent type oil most likely to be used?
  77. #709 With respect to lubricating oils, what statement is true concerning viscosity and viscosity index?
  78. #710 Which statement is true concerning alkaline reserve as it applies to a lubricating oil?
  79. #713 On a bearing using an oiling ring as a means of static oil feed, at what oil level is the bearing maintained?
  80. #716 If the bearings of a piece of machinery are force-fed by a pressure feed lubricating oil system, which statement is true?
  81. #721 In a forced-feed lubrication system, what statement is true concerning lube oil reservoir/sump residence time?
  82. #723 The greatest difference between absorbent and adsorbent filters is that absorbent filters __________.
  83. #724 Which of the following statements best describes the straining ability of a fine mesh metal lube oil strainer?
  84. #725 Which of the following lube oil filters would be considered acceptable for use with today's high detergent additive type oils?
  85. #726 Which of the filter/strainer units listed permits you to replace or clean the element while leaving the system on the line?
  86. #727 Which of the following types of diesel engine lubricating oil filtration schemes must be equipped with a bypass relief valve to insure that the engine...
  87. #728 Which of the following types of lubricating oil filters is not fitted with a replaceable filter element and is serviced by cleaning?
  88. #729 What type of diesel engine lubricating oil filtration scheme filters the entire output of the lubricating oil pump prior to delivery to the lubricatin...
  89. #730 What type of diesel engine lubricating oil filtration scheme filters a small portion of the output of the lubricating oil pump prior to delivery back...
  90. #731 What is the BEST indication that a diesel engine full-flow lubricating oil filter must be serviced?
  91. #741 What effect does preheating, concurrent heating, or post heating have on a welding a joint?
  92. #744 Referring to the illustration, suppose after initiating the oil discharge mode, the oily- water separator fails to come out of the oil discharge mode... illustration
  93. #745 Referring to the illustration, what would be the result if the lower oil/water interface detection probe became faulty? GS-0175 illustration
  94. #746 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
  95. #747 If item "1" in the illustrated oily water separator indicates an abnormally deep vacuum, which of the following conditions is the most probable cause?... illustration
  96. #756 The line labeled "G", as shown in the illustration, would be identified as the ______. GS-0175 illustration
  97. #757 What is the normal direction of flow through the device shown in the illustration while operating in the processing mode? GS-0153 illustration
  98. #758 The line labeled "E", as shown in the illustration, would be identified as the ______. GS-0175 illustration
  99. #759 The components indicated as "7" and "8" as shown in the illustration, are known as the __________. GS-0153 illustration
  100. #760 The function of item "7" shown in the illustration is to __________. GS-0153 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.