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Engine · 1,465 questions

General Subjects - USCG Exam Questions

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 General Subjects questions

Questions 1,201–1,300 of 1,465 · page 13 of 15

  1. #2426 How would you prevent the rudder from moving while a repair is made on the steering system using the illustrated actuator? illustration
  2. #2427 How may a suspected tube leak on a shell-and-tube jacket-water cooler most easily be located?
  3. #2428 Assuming that a standard micrometer (without a Vernier scale) has the ability to read to the nearest one thousandth of an inch, such a micrometer with...
  4. #2429 What is the name of an internal passage of watertight construction fitted along the centerline between the double bottoms of some ships, usually from...
  5. #2430 Which of the following conditions will occur if the power element of the thermostatic expansion valve shown in the illustration loses its charge? illustration
  6. #2431 When accomplishing welding repairs using the electric arc welding process, what statement is true concerning the characteristics of a good quality wel...
  7. #2432 What advantage does a 4-pipe hydronic heating/cooling system have over a 2-pipe hydronic heating/cooling system? illustration
  8. #2433 For a typical transverse-framed deep-draft commercial vessel, what is the normal arrangement for the support of decks?
  9. #2434 Which of the following statements is true concerning the gauge labeled "A" of the illustrated gauge manifold set? illustration
  10. #2435 In accordance with 33 CFR Subchapter O (Pollution), which type of Marine Sanitation Device (MSD) is used solely for the storage of sewage and flush wa...
  11. #2436 Charging liquid HCFC-123 into a system under a deep vacuum could cause what to happen unless necessary precautions are taken?
  12. #2437 The action necessary to use the steering gear room trick wheel when transferring the steering control from the wheelhouse to local control is to _____...
  13. #2438 Figure "A" shows a block diagram of a central operating system configured for direct digital control. What is the function of the output system block... illustration
  14. #2439 Concerning governor speed droop, what statement is true?
  15. #2440 Capacity control of a centrifugal-refrigeration compressor can be accomplished by what means?
  16. #2441 For marine-type shell-and-tube heat exchangers, what is the most common arrangement for baffles?
  17. #2442 The device shown in the illustration is being used to control the output of an axial piston pump. "T" is the exhaust to pump casing. "P" is the supply... illustration
  18. #2443 Aftercoolers are used with air compressors to __________.
  19. #2444 Which of the following deballasting operations performed in conjunction with loading cargo could be accomplished without the use of a ballast pump?
  20. #2445 Under the federal regulations of, if a vessel equipped with a Type III Marine Sanitation Device enters a body of water where the discharge of untreate...
  21. #2446 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
  22. #2447 Suppose a steam trap's primary purpose is to keep a steam line dry. What would be the outcome if the trap were to fail in a closed position?
  23. #2448 Which of the following listed bulkhead types has the most rigorous standard for testing purposes?
  24. #2449 If an air compressor is fitted with a hand-off-auto (H-O-A) control station, what statement concerning operation is true?
  25. #2450 When taking a shell-and-tube heat exchanger with a removable tube bundle such as a bayonet-tube heavy fuel oil service heater out of service, to preve...
  26. #2451 Given that valve "14" is the king solenoid valve, which of the following statements is true? illustration
  27. #2452 A hydraulic system gear pump being fed from a reservoir frequently indicates signs of excessive pitting after two months of service. Which of the foll...
  28. #2453 Suppose a temperature transmitter has an input range from 0 to 100 degrees Celsius and an output range of 4 to 20 milliamps. If the transmitter has a...
  29. #2454 While calibrating an electronic 4-20 mA or 3-15 PSI pneumatic controller, what is the value of 'Live Zero'?
  30. #2455 A 'Proportional Only' controlled automatic process loop is oscillating continually, above and below the setpoint. To stabilize this controller and loo...
  31. #2456 In accordance with 46 CFR Subchapter E (Load Lines), an international and coastwise load line assignment and certificate issued to a vessel by the Ame...
  32. #2457 A water line ruptures under pressure and floods the engine room causing $30,000(USD) damage to the machinery. By law, this must be reported to the ___...
  33. #2458 As it pertains to the hoist motion limits associated with an electro-hydraulic cargo-handling pedestal-type deck crane, which statement is true?
  34. #2459 In the illustrated single zone HVAC system, what statement represents the relationship between the exhaust, outside air and recirculation dampers? illustration
  35. #2460 What leadership style tends to extrinsically motivate employees on a contingent reward system where the focus is on outcomes?
  36. #2461 Which of the following conflict resolution techniques represents a strategy where everyone wins?
  37. #2462 In accordance with 33 CFR Subchapter O (Pollution), which of the following documents would be the most useful in dealing with a vessel oil spill resul...
  38. #2463 In accordance with 46 CFR Subchapter F (Marine Engineering), which of the following pressure vessels listed on the ship's Certificate of Inspection (C...
  39. #2464 You are at a shipyard in dry-dock. New anodes for the impressed current system are being installed. The yard workers are installing the capastic layer...
  40. #2465 As a chief engineer aboard a vessel that has just been drydocked and is being connected to shipyard facilities, what would you consider to be your FIR...
  41. #2466 On a PERT network (or arrow or line), what do the circles which are the beginning points or ending points for arrows or lines represent?
  42. #2467 Decisions must be made based upon the appropriate response to a given situation. Which of the following situations requiring a decision require a diff...
  43. #2468 What is meant by the term empowering employees?
  44. #2469 Progressive discipline is discipline that uses a graduated scale of penalties which become progressively more severe each time a particular violation...
  45. #2470 Elevated metal levels present in a recent sample of used diesel engine crankcase lubricating oil is indicative of a condition. What would high silicon...
  46. #2471 Fuel density is easily checked on board ship to facilitate proper fuel treatment. What is the maximum fuel density at 15oC allowed for proper centrifu...
  47. #2472 What type of maintenance system would be associated with manufacturer recommendations as a function of machinery running hours?
  48. #2473 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
  49. #2474 The sectional lines drawn within the flange sections, shown in the illustration, indicate the __________. illustration
  50. #2475 As shown in the illustration, a section of standard weight, seamless steel pipe, has an external diameter of 4.0 inches. When the pipe, is bent into a... illustration
  51. #2476 A hydraulic system flow control circuit is shown in the illustration and is known as a __________. illustration
  52. #2477 Regarding a ballast system associated with a dry cargo ship, what is the primary purpose of the fore peak and aft peak tanks?
  53. #2478 Which of the following compressors would be used for a dead ship start-up of a ship's service diesel- generator on a motor ship?
  54. #2479 In a closed-loop process control system featuring negative feedback, what is the function of the error detector within the controller?
  55. #2480 Figure "A" shows a block diagram of a central operating system configured for direct digital control. What function is accomplished by the output syst... illustration
  56. #2481 After adding grease to a ball bearing with a hand-held grease gun, you should __________.
  57. #2482 Line "K" shown in the illustration is the __________. illustration
  58. #2483 In the unit illustrated, the feedwater temperature is required to be increased to 165°F or greater and must exist at this temperature when leaving ___... illustration
  59. #2484 With regard to the number of passes through the tubes of shell-and-tube heat exchangers, what statement is true?
  60. #2485 In which lubrication application is a detergent type of oil most likely to be used?
  61. #2486 Adsorption filters are not commonly used in steam turbine or diesel engine lubricating systems because they __________.
  62. #2487 With respect to lubricating oils, what statement is true concerning viscosity and viscosity index?
  63. #2488 What is an engine room bilge oily-water separator designed to do?
  64. #2489 The line labeled "G", as shown in the illustration, would be identified as the ______. illustration
  65. #2490 Suppose the illustrated self-contained, internal-pilot, piston-operated temperature control valve is part of the temperature control system for a stea... illustration
  66. #2491 What type of line is represented by label "D" in the diagram? illustration
  67. #2492 Which of the following propulsor types represents the proper terminology for a Kort nozzle?
  68. #2493 Which of the following propulsor types represents the proper terminology for electric propulsion where the drive motors are outside the ship's hull?
  69. #2494 The function of the section labeled "C" in the device illustrated is to provide a/an __________. illustration
  70. #2495 When responding to a "right rudder" command from the amidships position, which part/parts of the steering cylinders illustrated will be subjected to t... illustration
  71. #2496 In accordance with international MARPOL Annex I regulations and federal regulations under 33 CFR Subchapter O (Pollution), for vessels of 400 gross to...
  72. #2497 If an oil-in-water content monitor uses a lamp emitting light in the visible spectra in conjunction with a reference photocell and a sampling photocel...
  73. #2498 When making welding repairs to a ship's structural member, why is it important to avoid weld faults?
  74. #2499 What statement is true concerning the construction of watertight bulkheads?
  75. #2500 While in dry-dock, what means are provided for completely draining the double bottom tanks in preparation for inspection?
  76. #2501 In terms of ship construction framing methods, which statement is true concerning the transverse framing system?
  77. #2502 If immediate action is required to ensure the safety of the ship, its machinery, and crew, who has the responsibility to take this action?
  78. #2503 Which of the following refrigerants is normally classified as a low-pressure refrigerant based on a relatively high boiling point?
  79. #2504 The term "oil foaming" in refrigeration practice, is used to describe what event?
  80. #2505 During operating periods of a multi-box refrigeration system using a capacity-controlled compressor, when all of the evaporators of a four-box plant a... illustration
  81. #2506 Which of the following electrically operated refrigeration system valves would be most appropriate for use as a 2-position diverting hot gas bypass so... illustration
  82. #2507 As shown in the illustrated refrigeration system piping schematic diagram with the various accessories and controls and equipped with an air-cooled co... illustration
  83. #2508 As shown in figure "B" of the illustrated self-contained recovery unit connection diagrams, what is the recovery method supported by the connection sc... illustration
  84. #2509 Figure "B" shows a block diagram of a central operating system configured for supervisory control. What is the function of the block labeled "ANALOG (... illustration
  85. #2510 Which of the freshwater generators listed below is operated without a source of heat?
  86. #2511 Which of the following roller bearing types would be limited to radial thrust load applications?
  87. #2512 Regarding a freshwater generator of the reverse-osmosis type, what statement is true?
  88. #2513 According to the illustration, which of the following conditions would most likely cause pump "A" to short cycle? illustration
  89. #2514 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...
  90. #2515 When placing a shell-and-tube heat exchanger with a non-removable tube bundle such as a lube oil cooler with fixed tube sheets into service, to avoid...
  91. #2516 A flare-type tubing connector is used in the hydraulic hatch cover system and has developed a slight leak. To stop the leak you should __________.
  92. #2517 In which lubrication application is a lubricating oil with an alkaline reserve most likely to be used?
  93. #2518 A typical oily-water separator has three stages of separation. Which statement represents the correct sequential order of the stages?
  94. #2519 Suppose the pilot pressure range is from 3 to 15 psig for the illustrated pneumatically operated diaphragm actuated control valve. Assuming the contro... illustration
  95. #2520 In the illustration, line "C" is a __________. illustration
  96. #2521 The working depth of the gear illustrated is represented by __________. illustration
  97. #2522 Which of the figures illustrated would be LEAST desirable for use as a set screw? illustration
  98. #2523 Even though bilge keels do provide some improvement in longitudinal strength at the bilge radius, what is the primary purpose of the bilge keels?
  99. #2524 What is another name for the "collision" bulkhead?
  100. #2525 Light and other forms of radiation can act as a means of transporting heat energy from one body to another. This radiative transport is different from...

General Subjects questions: what to expect

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

There are 1,465 General Subjects questions on this site, every one released by the U.S. Coast Guard or taken from the National Maritime Center's sample examinations, with its correct answer. The exam draws its General Subjects module from the same pool.

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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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.