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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 501–600 of 674 · page 6 of 7

  1. #1193 If the distances "A" and/or "B" as shown in the illustration are excessively increased, the tool will __________. GS-0085 illustration
  2. #1196 Which of the following definitions accurately describes 'tool feed' when referring to lathe work?
  3. #1202 Which of the lathe operations listed is best done with the carriage locked in position?
  4. #1205 To drill a hole in round stock, perpendicular to the axis of the piece, the stock should be mounted in a __________.
  5. #1206 When drilling blind holes with a standard drill press, the proper method of stopping the progress of the drill boring through the work is by _________...
  6. #1211 If the speed of a drill is too great, the drill will __________.
  7. #1213 The action necessary to use the steering gear room trick wheel when transferring the steering control from the wheelhouse to local control, is to ____...
  8. #1218 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
  9. #1219 When responding to a 'right rudder' command from the amidships position, which parts of the steering gear system illustrated will be subjected to the... illustration
  10. #1222 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
  11. #1223 If oil under pressure is supplied to the area noted as "N" on the vane in the illustration __________. GS-0116 illustration
  12. #1224 The operation of the device shown in the illustration is dependent upon __________. GS-0116 illustration
  13. #1226 What process control system control mode is most likely to have steady-state error (also known as offset or residual error)?
  14. #1227 For a process control system using the proportional control mode, what statement is true?
  15. #1228 Suppose a temperature transmitter has an input range from 0 to 100 degrees Celsius and an output range of 4 to 20 milliamps. Assuming that the transmi...
  16. #1241 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
  17. #1242 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
  18. #1246 As routine maintenance, the bilge manifold valves are periodically removed and examined. Prior to resecuring the valve bonnets, the valve __________.
  19. #1256 The second stage feed water temperature and shell absolute pressure in a multistage, flash type, distilling plant is __________.
  20. #1259 A fixed orifice plate is generally installed in the live steam supply to a flash evaporator. One of the functions of this orifice is to control the qu...
  21. #1260 The final heating of the feed water in a flash type distilling plant is carried out by __________.
  22. #1263 The purpose of chill shocking an evaporator is to __________.
  23. #1265 When conducting a hydrostatic test on the distillate cooler shell of a flash type evaporator, liquid appears well inside one of the tubes. In order to...
  24. #1270 A high reading is indicated at the salinity cells labeled "Y", "Q", and "6" shown in the illustration. This would be the probable result of __________... illustration
  25. #1272 While operating a two-stage flash-type evaporator, designed to operate in sea water of 70°F, the current seawater temperature is 50°F, while the salt...
  26. #1273 While operating a two-stage flash-type evaporator, designed to operate in sea water of 70°F, the current seawater temperature is 50°F, while the salt...
  27. #1276 What is the function of device "B" shown in the illustration? MO-0110 illustration
  28. #1277 Which of the following conditions occurs in the section labeled "F" of the device shown in the illustration? MO-0110 illustration
  29. #1278 For the operation of the illustrated device, what fluid flow would be expected at the connection labeled "I"? MO-0110 illustration
  30. #1279 Which of the following is NOT a function of the water supply through item "P" shown in the illustration? MO-0110 illustration
  31. #1280 The pipe identified by the letter "J" shown in the illustration is __________. MO-0110 illustration
  32. #1281 When tightening the plate type heat exchangers shown in the illustration, care must be taken to __________. MO-0110 illustration
  33. #1283 If the demister used in the device shown in the illustration is improperly installed, which of the following will occur? See Illustration MO-0110 illustration
  34. #1284 Which of the following conditions can cause high salinity of the distillate due to sea water leakage in the illustrated device. MO-0110 illustration
  35. #1299 Regarding a freshwater generator of the reverse-osmosis type, what statement is true?
  36. #1302 Regarding the high-pressure pump of a reverse-osmosis freshwater generator, what statement is true?
  37. #1303 In order for a reverse-osmosis freshwater generator to be able to overcome the osmotic pressure without damaging the spiral-wound membrane modules, th...
  38. #1306 For the successful operation of a reverse-osmosis freshwater generator, the setting of the brine back pressure regulator is critical. What statement r...
  39. #1307 What is the BEST indication that the pre-treatment filter (or filters) of a reverse-osmosis freshwater generator must be serviced by cleaning or repla...
  40. #1310 Under what conditions would the pre-treatment capabilities of a reverse-osmosis freshwater generator MOST likely be overloaded, and as a result, these...
  41. #1311 If a reverse-osmosis freshwater generating unit has a high salinity alarm associated with the freshwater outlet, what should be done?
  42. #1315 In a flash-type evaporator, an electrical salinity cell would be installed in the __________.
  43. #1317 Distilled water from an evaporator may be discharged into a potable water tank __________.
  44. #1318 An automatic solenoid dump valve should be set to trip if the evaporator produces distillate with salt content exceeding __________.
  45. #1319 Which of the following statements describes the proper operation of a three-way solenoid trip/dump valve on a two stage flash-type evaporator?
  46. #1330 What is statement is true concerning the term "isochronous" as it applies to prime mover speed control governors?
  47. #1333 Referring to illustrated steam plant seawater cooling system drawing, what statement is true concerning seawater service system to auxiliary circulati...
  48. #1334 Referring to the illustrated motor ship fresh water cooling system drawing, what statement is true concerning the jacket water heater? (MP-CW-06) illustration
  49. #1336 A horizontal electro-mechanical anchor windlass is equipped with two warping heads, two wildcats, two manual brake hand wheels, two clutch control lev...
  50. #1337 A horizontal electro-mechanical anchor windlass is equipped with two warping heads, two wildcats, two manual brake hand wheels, two clutch control lev...
  51. #1345 A solenoid direct-acting three-position spring-centered directional control valve is used in a hydraulic system to control a linear actuator. When the...
  52. #1347 If the operating pressure is determined to be normal in the system shown in the illustration, yet the crane does not swing (slew) in either direction... illustration
  53. #1348 Increased internal leakage, in addition to poor hydraulic system response, and inadequate lubrication, is the result of __________.
  54. #1349 Cavitation in a hydraulic pump is indicated by noisy pump operation and can be caused by a/an __________.
  55. #1353 A hydraulic flow control circuit is shown in the illustration, and is known as a __________. GS-0107 illustration
  56. #1355 A hydraulic fluid flow control circuit, controlling linear actuator speed, with the pump operating below maximum operating pressure is known as the __...
  57. #1356 A hydraulic system flow-control circuit is shown in the illustration and is known as a __________. GS-0105 illustration
  58. #1361 Adsorption filters are not commonly used in steam turbine or diesel engine lubricating systems because they __________.
  59. #1362 The greatest difference between absorbent and adsorbent filters is that absorbent filters __________.
  60. #1364 Which of the following lube oil filters would be considered acceptable for use with today's high detergent additive type oils?
  61. #1366 The components indicated as "7" and "8" as shown in the illustration, are known as the __________. GS-0153 illustration
  62. #1367 The function of item "7" shown in the illustration is to __________. GS-0153 illustration
  63. #1368 The component labeled "A", as shown in the illustration, would be identified as the __________. Illustration GS-0175 illustration
  64. #1369 The line labeled "E", as shown in the illustration, would be identified as the ______. GS-0175 illustration
  65. #1371 Referring to the illustration, an oil-water separator is in the re-circulation mode due to high oil content of the processed water outlet. What action... illustration
  66. #1372 Referring to the illustration, what would be the result if the upper oil/water interface detection probe became faulty? GS-0175 illustration
  67. #1373 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
  68. #1374 Referring to the illustration, suppose the oily-water separator vessel compound gauge is showing an unusually deep vacuum for operating in the separat... illustration
  69. #1375 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
  70. #1376 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
  71. #1377 Referring to the illustration, suppose while in the oil separation processing mode, the oil content detector display screen shows 17.9 ppm and the oil... illustration
  72. #1378 Which of the following propulsor types represents the proper terminology for a Voith- Schneider drive?
  73. #1393 If a main propulsion shafting arrangement is such that a strut and strut bearing is required, what is the name of the section of shafting that passes...
  74. #1398 A pumping system utilizing a centrifugal pump is designed for a specific discharge head in feet. What happens to the pump's discharge pressure when th...
  75. #1401 Both existing centrifugal cooling water pumps will be replaced by two of a higher GPM. Only one pump is used in normal operation and there will be no...
  76. #1402 The assistant engineer reports an installed centrifugal pump has a history of running higher than normal amperage since new construction. Capacity and...
  77. #1411 While pumping ballast the Chief Mate reports there is a decrease in vacuum on the pump suction when drawing from a partially full saddle tank. Which o...
  78. #1413 When reviewing log books, the main salt water cooling pump discharge pressure has decreased in the three years since overhaul. Which of the following...
  79. #1418 According to the illustration, which of the following conditions would most likely cause Pump "A" to short cycle? GS-0173 illustration
  80. #1419 The process of grinding, shredding, or reducing the size of sewage particles is known as __________.
  81. #1423 Referring to illustrated diagram, what type of HVAC system is shown? GS-RA-09 illustration
  82. #1424 Referring to illustrated diagram, what type of HVAC system is shown? GS-RA-42 illustration
  83. #1425 Referring to illustrated diagram, what type of HVAC system is shown? GS-RA-43 illustration
  84. #1428 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
  85. #1429 In the illustrated single zone HVAC system, what statement represents the relationship between the exhaust, outside air and recirculation dampers? Ref... illustration
  86. #1430 In the illustrated terminal reheat multiple zone system, what statement represents the functioning of the summer outside air duct thermostat? GS-RA-42 illustration
  87. #1431 Referring to the illustrated dual duct multiple zone HVAC system, how is the space temperature directly controlled? GS-RA-43 illustration
  88. #1432 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
  89. #1436 What advantage does a 4-pipe hydronic heating/cooling heating system have over a 2-pipe hydronic heating/cooling system?
  90. #1445 Referring to the illustrated psychrometric chart, if the dry bulb temperature is 70F and the relative humidity is 40%, what is the absolute humidity?... illustration
  91. #1446 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
  92. #1447 Referring the illustrated psychrometric chart, suppose during the cooling season that air passes over a cooling coil with a mean surface temperature a... illustration
  93. #1448 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. #1453 Oil sprays on to a hot piece of machinery, catches fire and causes $35,000 damage to your vessel. By law this must be reported to the __________.
  95. #1461 A water line ruptures under pressure and floods the engine room causing $(USA)30,000 damage to the machinery. By law, this must be reported to the ___...
  96. #1467 When tuning a Proportional, Integral, Derivative (PID) controller/loop, one should know/understand the influence of each action component on the loop....
  97. #1471 As the engineer, it is necessary to tune a proportional-integral-derivative (PID) control loop. If the PID incorporates all three functions, which fun...
  98. #1474 You are enthusiastically telling one of your 3rd Assistant Engineers, "You did a great job on that overhaul." What forms of non-verbal communication w...
  99. #1480 It has long been established that employee performance is linked to motivation. Which of the following levels of motivation would be considered to be...
  100. #1482 A system of rewards and punishments that follow a person's behavior as a way to shape that individual's future behavior is consistent with what motiva...

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.