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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 1,301–1,400 of 1,465 · page 14 of 15

  1. #2526 Referring to illustrated diagram, what type of HVAC system is shown? illustration
  2. #2527 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
  3. #2528 Which of the following flowmeter primary devices works on the constriction type, differential head principle?
  4. #2529 What is the pressure and condition of the refrigerant entering the receiver of a refrigeration system?
  5. #2530 If the discharge reed valves used in a refrigeration compressor are leaking badly, what statement is true?
  6. #2531 Which of the following illustrated thermal expansion valves would be appropriate to use on an evaporator coil with a 2-psi pressure drop, where extern... illustration
  7. #2532 A high-pressure centrifugal chiller, currently charged with R-134a, is being evaluated for leak testing. The machine is idle, the pressures equalized... illustration
  8. #2533 Which of the following statements is true concerning the illustrated gauge manifold set? illustration
  9. #2534 In an air conditioning system set up as shown in the illustration, as the room humidistat initiates the lowering of the humidity of the conditioned su... illustration
  10. #2535 Which of the listed valve types is typically used for the low-pressure stage of a reciprocating air compressor?
  11. #2536 Which figure in the illustration represents the proper method of circuit grounding for a low-level analog signal cable? illustration
  12. #2537 What is meant by the term "deadband" as it applies to prime mover speed control governors?
  13. #2538 Referring to the illustrated motorship freshwater cooling system drawing, which cooling system has cooling water passing through passages within compo... illustration
  14. #2539 For a typical transverse-framed deep-draft commercial vessel, what is the normal arrangement for the support of decks?
  15. #2540 Which of the fluids listed is suitable and commonly used as a secondary refrigerant?
  16. #2541 Which of the devices listed is used to maintain a snug interface between the rotating and stationary seal members shown in the illustration? illustration
  17. #2542 Which statement is correct for the illustrated circuit in figure "B"? illustration
  18. #2543 In figure "B" of the illustrated typical ground fault relay, what statement is TRUE concerning the leakage current setting adjustment? illustration
  19. #2544 The counterbalance valve (5) in the winch circuit shown in the illustration ________. illustration
  20. #2545 For a pneumatic transmission system for instrumentation purposes, if a pneumatic temperature indicator has a calibrated scale of -40 to +40oF, what wo...
  21. #2546 The device shown in the illustration is commonly known as a/an __________. illustration
  22. #2547 No two drills from differing drill size series are of the exact same size, with the exception of the drills measured as 0.25 inch. These two drills ar...
  23. #2548 With regard to a ballast system associated with a dry cargo ship, what is the primary purpose of the double bottom ballast tanks?
  24. #2549 Diesel-generators #1 and #2 operate in parallel with each machine operating at half-capacity. Diesel- generator #1 suddenly trips out mechanically due...
  25. #2550 Under what conditions is it permissible to pump machinery space bilges directly overboard without processing by an oily-water separator?
  26. #2551 Which of the illustrated devices would be the LEAST accurate for the purposes of weighing-in a refrigerant charge? illustration
  27. #2552 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
  28. #2553 Figure "B" is a block diagram of a central operating system configured for supervisory control. Concerning the block labeled "COMPUTER", and with resp... illustration
  29. #2554 Which of the following liquid level sensors would be most suitable for measuring the liquid level in a pressure vessel, such as a water-tube boiler st...
  30. #2555 If a heat exchanger is designed to cool lubricating oil using sea water as a cooling medium, what statement is true?
  31. #2556 A two-stage hydraulic pump unit is used to __________.
  32. #2557 What is the operating principle of detergent type lubricating oil that provides the oil with its unique properties?
  33. #2558 What statement is true with regard to the basic operating principle of gravity associated with an oily-water separator?
  34. #2559 In the figure shown in the illustration, the standard blueprint symbols above the letters "A", "B", and "C" indicate __________. illustration
  35. #2560 How would the pressure setting of the illustrated self-contained, internal-pilot, piston-operated steam pressure-reducer be raised to a higher setpoin... illustration
  36. #2561 Referring to the illustrated pump, what is the distance from the bottom of the inlet to the bottom end of the motor shaft? illustration
  37. #2562 By what means is electric current conveyed to the electric drive motor of a podded propulsor?
  38. #2563 If oil under pressure is supplied to the area identified as "N" in the illustration, what will occur? illustration
  39. #2564 While at normal sea speed the rudder movement stops, but is restored after changing over power units. At the earliest opportunity the faulty power uni... illustration
  40. #2565 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
  41. #2566 What statement is true concerning steam-heated, hot water heated, or electric-heated convectors?
  42. #2567 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
  43. #2568 For the power hacksaw shown in the illustration, how should the teeth point for the blade being installed? illustration
  44. #2569 What is the primary function of the devices shown in the illustration? illustration
  45. #2570 For a pneumatic transmission system for instrumentation purposes, if a pneumatic temperature indicator has a calibrated scale of -40 to +40oF, what wo...
  46. #2571 Bridge orders must be promptly carried out and a record kept. What orders must be recorded?
  47. #2572 Which of the drill sets listed would commonly be referred to as a 'Jobbers Set’?
  48. #2573 As it applies to a transverse-framed ship with double bottom construction, what does the term "floor" represent?
  49. #2574 When accomplishing welding repairs using the electric arc welding process, what statement is true concerning the characteristics of a good quality wel...
  50. #2575 In a closed-loop process control system, what term is used to describe the undesirable characteristic in which the error of a control system oscillate...
  51. #2576 Assuming valve "A" is correctly aligned in the no-flow position as shown with the system in operation, which of the following statements is true? illustration
  52. #2577 Your vessel is underway in periodically unmanned engine room condition. The No.2 SSDG is to be down for repairs for at least the next 24 hours. The ve...
  53. #2578 When changing to a fire-resistant hydraulic fluid in a system, it is important to check the compatibility of the new fluid with the system's _________...
  54. #2579 How can the chance of contaminating hydraulic fluid be decreased when working on hydraulic systems?
  55. #2580 Hydraulic system reservoirs are often fitted with a combined filler/breather cap. If the breather element becomes fouled, the __________.
  56. #2581 A gradual decrease in the discharge pressure of an operating hydraulic pump can be caused by __________.
  57. #2582 What will happen if oil under pressure is supplied to the area noted as "N" on the vane in the illustration? illustration
  58. #2583 Referring to the device shown in the illustration, which statement is TRUE in regard to what happens when the rudder stock rotates? illustration
  59. #2584 In accordance with 46 CFR Subchapter I (Cargo and Miscellaneous Vessels), it is the duty of the chief engineer to acquire and seal a sample of fuel oi...
  60. #2585 Alkylbenzene ISO 32 cSt synthetic refrigerant oil is miscible and suitable to use with which of the following refrigerants?
  61. #2586 The coil temperature measured at the expansion valve sensing bulb of an operating system is 10°F. The low side pressure with the compressor running as... illustration
  62. #2587 Using the device shown in the illustration, which of the following statements is true when adding refrigerant as a vapor to the low side of the refrig... illustration
  63. #2588 Some managers think that the average person has a dislike for work, avoids responsibility, and cannot be trusted. What type of leadership style is suc...
  64. #2589 Which of the following shipboard groups would be an example of an informal group?
  65. #2590 One is slated to be a senior officer of a new vessel and is to participate in the 'Builder's Sea Trials'. What would you consider your responsibilitie...
  66. #2591 What statement is true concerning a well-planned turnover procedure from one crew to another?
  67. #2592 What maintenance management scheme does trend analysis support?
  68. #2593 As a management level engineering officer, you are apt to be the primary investigator investigating the root cause of the failure of a piece of machin...
  69. #2594 What is the critical first step that must be carried out before executing a plan?
  70. #2595 Which of the following third parties utilized in alternative dispute resolution proceedings has the authority to make a binding decision?
  71. #2596 Which statement is TRUE concerning the signature of the Oil Record Book, according to 33 CFR Subchapter O?
  72. #2597 You are conducting an operational test of your main steering gear system. The main steering gear must be capable of moving the rudder from 35 degrees...
  73. #2598 One of your ship's direct-drive steering gear drive motors needs to be replaced. In accordance with 46 CFR Subchapter J, what minimum short-time ratin...
  74. #2599 In compliance with 33 CFR Subchapter O, what is the definition of a "Type I Marine Sanitation Device"?
  75. #2600 The water content of fuel is easily checked on board ship to ensure that serious problems do not result. What is the maximum water content of fuel tha...
  76. #2601 What is meant by the term "deadband" as it applies to prime mover speed control governors?
  77. #2602 If both the shell-and-tube lube oil cooler and shell-and-tube jacket water cooler of a diesel engine are sea water-cooled, what statement is true?
  78. #2603 What type of oil as part of an oily-water mixture is most likely to require heating to facilitate separation in an oily-water separator?
  79. #2604 The shaft sleeve for the pump shown in the illustration is identified by which item number? illustration
  80. #2605 Spring reinforced oil seals are generally installed with the tail or lip of the seal facing __________. illustration
  81. #2606 In the illustrated pneumatically operated, diaphragm actuated control valve, what statement is true concerning the opening and closing forces acting u... illustration
  82. #2607 Which of the projections represents the left side view of the object "X" in the illustration? illustration
  83. #2608 What does the symbol in figure "1" of the illustration represent? illustration
  84. #2609 Which motor has a frame configuration for solid base mounting only? illustration
  85. #2610 What is the length of the stud used to secure the packing gland shown in the illustration? illustration
  86. #2611 A hydraulic flow control circuit is shown in the illustration and is known as a __________. illustration
  87. #2612 If the pump in a hydraulic system produces a low rumbling noise while in operation, this is a probable indication of __________.
  88. #2613 What type of line is represented by the label "D" in the diagram? illustration
  89. #2614 In a closed-loop process control system, what is meant by error?
  90. #2615 When tuning a proportional-integral-derivative (PID) controller/loop, one should know/understand the influence of each action component on the loop. W...
  91. #2616 A 'Proportional Only' controlled automatic process loop is oscillating continually, above and below the setpoint. To stabilize this controller and loo...
  92. #2617 Which of the following statements is true? illustration
  93. #2618 Which of the lettered components shown in the illustration indicates the high-pressure cutout? illustration
  94. #2619 Oil sprays on to a hot piece of machinery, catches fire and causes $35,000 damage to your vessel. according to the CFR, who must this event be reporte...
  95. #2620 Which of the following is true concerning the class "A" air conditioning system shown in the illustration as used to condition the air of large public... illustration
  96. #2621 When recovering the remaining R-134a refrigerant from the centrifugal chiller shown in the illustration as a vapor using the recovery unit's compresso... illustration
  97. #2622 What do hydraulically, servo-operated, automatic, changeover valves, used in a two-ram hydraulic steering gear accomplish?
  98. #2623 A horizontal electro-mechanical anchor windlass is equipped with two warping heads, two wildcats, two manual brake handwheels, two clutch control leve...
  99. #2624 Engineering departments may experience a barrier to free and open communication vertically upward from subordinates to managers. What is the primary r...
  100. #2625 During the "forming" stage of group development, members are trying to determine the task of the group and their role expectations of one another. As...

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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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.