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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 301–400 of 674 · page 4 of 7

  1. #761 The line labeled "C", as shown in the illustration, would be identified as the ______. GS-0175 illustration
  2. #762 When the oily water separator, shown in the illustration, is in operation and processing clear bilge water, what should be the internal water level? G... illustration
  3. #763 How would the pressure setting of the illustrated self-contained, internal-pilot, piston- operated steam pressure-reducer be reduced to a lower set po... illustration
  4. #764 Suppose the illustrated self-contained, internal-pilot, piston-operated steam pressure- reducing valve is part of a 600-to150 psig reducing station. I... illustration
  5. #765 In the illustrated self-contained, internal-pilot, piston-operated steam pressure- reducing valve, what statement is true concerning the opening and c... illustration
  6. #766 How would the illustrated valve respond to a complete loss of charge from the remote bulb-to-control diaphragm power element if the valve is used as a... illustration
  7. #767 In the illustrated self-contained, internal-pilot, piston-operated temperature control valve, what statement is true concerning the pilot and main val... illustration
  8. #768 Suppose the illustrated self-contained, internal-pilot, piston-operated temperature control valve is part of the temperature control system for a stea... illustration
  9. #770 Referring to the illustrated huddling-chamber safety valve, what statement concerning the blow down adjusting ring (B) is true? (SG-0018)
  10. #772 Referring to the illustrated huddling-chamber safety valve, what statement is true concerning the adjustment of the popping pressure? (SG-0018)
  11. #774 Concerning pressure-relief valves, what statement is true?
  12. #775 Concerning sentinel valves, what statement is true?
  13. #776 Referring to the illustrated pneumatically-operated diaphragm-actuated control valve, what statement is true? GS-0051 illustration
  14. #777 Suppose the illustrated pneumatically-operated diaphragm-actuated control valve is used to control the fuel oil outlet temperature of a steam-heated h... illustration
  15. #778 Assuming that the flow is from left to right on the illustrated pneumatically-operated diaphragm-actuated control valve, what statement is true? GS-00... illustration
  16. #779 In the illustrated pneumatically-operated diaphragm-actuated control valve, what statement is true concerning the opening and closing forces acting up... illustration
  17. #780 Referring to the illustrated pneumatically-operated diaphragm-actuated control valve, what statement is true? GS-0051 illustration
  18. #781 Suppose the pilot pressure range is from 3 to 15 psig for the illustrated pneumatically-operated diaphragm-actuated control valve. Assuming the contro... illustration
  19. #785 Referring to the illustrated bellows-type thermostatic steam trap, what statement is true concerning its operation? GS-0005 illustration
  20. #786 Referring to the illustrated impulse steam trap, what would be the effect of threading the control cylinder "E" downward further into the trap body? G... illustration
  21. #788 In the illustration shown, an efficient seal is maintained between the suction cover and the volute by __________. GS-0012 illustration
  22. #789 In the pump shown in the illustration, what is the distance from the bottom of the inlet to the bottom end of the motor shaft? GS-0011 illustration
  23. #790 What is the length of the stud used to secure the packing gland shown in the illustration? GS-0012 illustration
  24. #791 Which of the speeds listed represents the synchronous speed rating of the lube oil pump motor shown in the illustration? GS-0011 illustration
  25. #792 The working depth of the gear illustrated is represented by __________. Refer to Illustration GS-0111 illustration
  26. #793 What is the distance between the center of the discharge outlet and the top of the motor illustrated? GS-0011 illustration
  27. #794 Which letter represents the gear tooth working depth of the gear set illustrated? Refer to Illustration GS-0111 illustration
  28. #795 The illustration is drawn to a scale of 3/8 inch = 1 inch. What is the full size dimension of "X", if the scale lengths for "E" = 5/8", "F" = 1 3/8",... illustration
  29. #796 The physical feature indicated for each of the smallest diameter ends of the device illustrated is that they are __________. GS-0008 illustration
  30. #797 Which of the following statements is correct regarding the device shown in the illustration? GS-0008 illustration
  31. #798 Figure "B", shown in the illustration, is dimensioned to indicate a/an __________. GS-0019 illustration
  32. #799 The dimension of the sensing gap in the left hand limit sensor assembly shown in the illustration is __________. GS-0010 illustration
  33. #800 The shaft shown in the illustration has an overall length of 42 inches in addition to the following dimensions of "A" = 8", "B" = 8", "C" = 10", and "... illustration
  34. #801 The letters 'NPT' used in the notation 1/8-27 NPT as shown in the illustration, indicates the __________. GS-0010 illustration
  35. #802 The illustration shown represents a blueprint of a metal __________. GS-0028 illustration
  36. #803 In the illustration, line "C" is a __________. GS-0006 illustration
  37. #804 In the figure shown in the illustration, the standard blueprint symbols above the letters "A", "B", and "C" indicate __________. GS-0036 illustration
  38. #805 How many hidden lines are shown in the right side (end) view of the drawing illustrated? GS-0021 illustration
  39. #806 In the illustration, line "D" is a/an __________. GS-0006 illustration
  40. #807 A 'centerline' depicted in a drawing or blueprint is represented by which of the figures shown in the illustration? GS-0031 illustration
  41. #808 In the illustration shown, what is the proper description of the hole represented by "C"? GS-0015 illustration
  42. #809 In the illustration, line "J" is used to depict a _________? GS-0006 illustration
  43. #810 In the illustration, line "C" is a __________. GS-0006 illustration
  44. #811 A 'centerline' depicted in a drawing or blueprint is represented by which of the figures shown in the illustration? GS-0031 illustration
  45. #812 59. Using the information in the illustration shown, the tail of the welding symbol will __________.GS-0030 illustration
  46. #813 As shown in the illustration, if figure "21" indicates the "TOP VIEW" of an orthographic projection, and figure "11" indicates the "FRONT VIEW", which... illustration
  47. #814 Which of the projections represents the left side view of the object "X" in the illustration? GS-0022 illustration
  48. #815 The exploded drawing shown in the illustration is intended to show the __________. GS-0025 illustration
  49. #816 Of the views labeled "1", "2", "3", and "4", select the one that correctly represents the right side view of the unnumbered object in the illustration... illustration
  50. #817 Which of the figures shown in the illustrations depicts an orthographic projection? GS-0142 illustration
  51. #821 What mode of heat transfer is associated with the transport of thermal energy through a transparent medium by means of electro-magnetic energy in the...
  52. #835 Which of the following propulsor types represents the proper terminology for a Kort nozzle?
  53. #836 Which of the following propulsor types represents the proper terminology for a Voith- Schneider drive?
  54. #841 Which of the following propulsor types represents the proper terminology for a Z- drive?
  55. #852 What is meant by the term "right-handed" propeller?
  56. #858 With respect to a "tractor" type azimuthing thruster, what statement is true?
  57. #880 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
  58. #881 The function of the section labeled "C" in the device illustrated is to provide a/an __________. GS-0075 illustration
  59. #882 What type of pump is shown in the illustration? GS-0144 illustration
  60. #883 Spring reinforced oil seals are generally installed with the tail or lip of the seal facing __________. GS-0152 illustration
  61. #901 A recirculating, or bleed off line is installed on a centrifugal pump in order to __________.
  62. #904 The shaft sleeve for the pump illustrated is identified by the item numbered as __________. GS-0143 illustration
  63. #906 Item "B" in the pump illustration is the __________. GS-0129 illustration
  64. #907 Why are removable sleeves installed on centrifugal pump shafts?
  65. #943 According to the illustration, which of the following conditions would most likely cause pump "A" to short cycle? GS-0173 illustration
  66. #951 Expansion tanks when used in a ship's low temperature hot water heating system may be of the open or closed type. Referring to the illustrated central... illustration
  67. #952 Referring to the illustrated diagram for a central-station hookup for a hot-water heating system, what statement represents the configuration of the s... illustration
  68. #954 Referring to the illustrated drawing of the central-station hookup for a hot-water heating system, what statement is true concerning the air separator... illustration
  69. #958 What advantage does a 4-pipe hydronic heating/cooling heating system have over a 2-pipe hydronic heating/cooling system?
  70. #961 What type of fan is most commonly used in ducted air-conditioning systems?
  71. #963 What pressure drop across an air-conditioning filter is indicative of a need to replace or clean the filter as appropriate?
  72. #964 Concerning air-conditioning system steam heating coils, what statement is true?
  73. #965 Concerning air-conditioning system hot-water heating coils, what statement is true?
  74. #968 Concerning air-conditioning system dry-expansion cooling coils, what statement is true?
  75. #973 To prevent damage to dry cargoes, the cargo hold ventilation and dehumidification systems play a key role. In terms of the maintained dew point, what...
  76. #978 Referring to illustrated diagram, what type of HVAC system is shown? GS-RA-09 illustration
  77. #979 Referring to illustrated diagram, what type of HVAC system is shown? GS-RA-42 illustration
  78. #980 Referring to illustrated diagram, what type of HVAC system is shown? GS-RA-43 illustration
  79. #983 In the illustrated single zone HVAC system, what prevents the simultaneous flow of steam through the preheat coil and flow of chilled water through th... illustration
  80. #984 In the illustrated single zone HVAC system, what statement represents the functioning of the diverting relay as it controls the cooling coil flow and... illustration
  81. #985 In the illustrated single zone HVAC system, what statement represents the relationship between the exhaust, outside air and recirculation dampers? GS-... illustration
  82. #986 In the illustrated terminal reheat multiple zone system, what statement represents the functioning of the winter outside air duct thermostat? GS-RA-42 illustration
  83. #987 In the illustrated terminal reheat multiple zone system, what statement represents the functioning of the summer outside air duct thermostat? GS-RA-42 illustration
  84. #988 In the illustrated terminal reheat multiple zone system, what statement represents the functioning of the supply air duct thermostats controlling the... illustration
  85. #989 Referring to the illustrated single zone HVAC system diagram, what statement is true concerning the damper controls? GS-RA-09 illustration
  86. #990 Referring to the illustrated dual duct multiple zone HVAC system, how is the space temperature directly controlled? GS-RA-43 illustration
  87. #993 Referring to the illustrated psychrometric chart, if the dry bulb temperature is 70F and the relative humidity is 50%, what is the absolute humidity?... illustration
  88. #994 Referring to the illustrated psychrometric chart, if the measured dry-bulb temperature oo is 80F and the measured wet-bulb temperature is 70F, what is... illustration
  89. #995 Referring to the illustrated psychrometric chart, suppose air at a dry-bulb temperature of 60F and a relative humidity of 52% passes over a heating co... illustration
  90. #996 Referring the illustrated psychrometric chart, suppose during the heating season that air passes over a heating coil, and this results in sensible hea... illustration
  91. #997 Referring the illustrated psychrometric chart, suppose during the cooling season that air passes over a cooling coil with a mean surface temperature a... illustration
  92. #998 Referring the illustrated psychrometric chart, suppose during the cooling season that air passes over a cooling coil with a mean surface temperature b... illustration
  93. #999 Referring to the illustrated psychrometric chart, under what conditions are the dry- bulb, wet-bulb, and dew point temperatures for air all equal in v... illustration
  94. #1000 Referring the illustrated psychrometric chart, suppose during the heating season where steam is injected into the air stream, this results in sensible... illustration
  95. #1001 48. You are unable to pump out the aft starboard engine room bilge well that is fouled, with one foot of water over the top of the bilge well, what ac...
  96. #1002 Probably the most useful troubleshooting tools used in a predictive maintenance management program for shipboard machinery are vibration meters, analy...
  97. #1006 What is meant by a critical speed for rotating machinery?
  98. #1008 The reading on the vernier caliper scale shown in figure "G" in the illustration is __________. GS-0082 illustration
  99. #1014 To check the thickness of a piece of thin shim stock before using it to make a bearing shim, you should use a __________.
  100. #1017 With respect to machine shop "taps and dies", a plug tap is correctly used for __________.

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.