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Engine · 1,128 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 1–100 of 1,128 · page 1 of 12

  1. #2 If a heat exchanger is designed to condense refrigerant vapor using central cooling fresh water as a condensing medium, what statement is true?
  2. #5 The general purpose of a heat exchanger is to __________.
  3. #6 Pressure in an operating hydraulic system is developed __________.
  4. #9 The by-products of oxidation, as a result of water contamination of hydraulic oil, are generally __________.
  5. #10 Energy losses occurring in a hydraulic system are ultimately absorbed by the __________.
  6. #16 Energy imparted to the hydraulic fluid in an operating hydraulic system is stored in the __________.
  7. #17 The component which is used to thoroughly separate small, fine, dust-like particulate contamination from hydraulic fluid is a/an __________.
  8. #19 The portion of a hydraulic hose that determines its overall strength is the __________.
  9. #21 To convert a vane type hydraulic pump to a hydraulic motor, which of the following would have to be done?
  10. #23 Return lines in a non-pressurized hydraulic system reservoir should enter the tank well below the fluid surface level to __________.
  11. #28 If a standard bourdon tube type pressure gauge that is designed to measure and display gauge pressure reads 43.8 psig, what would be the equivalent ab...
  12. #30 What type of direct reading thermometer works on the principle of differential expansion of dissimilar metals as the temperature rises and features a...
  13. #32 If the mercury has become separated in a liquid-in-glass thermometer, what can be done to correct this situation?
  14. #33 What statement is true concerning the vent pipes and sounding tubes associated with a vented tank?
  15. #34 What statement best represents the characteristics of an innage tape and bob for the purposes of taking a vented tank sounding?
  16. #36 What statement best represents the characteristics of innage and ullage tank soundings?
  17. #42 For a lubricating oil, what is the relationship between viscosity and temperature?
  18. #43 What statement is true concerning viscosity index as it applies to lubricating oils?
  19. #44 What type of grease is the most commonly used aboard ship?
  20. #49 Which one of the following is a difference between a typical relief valve and a typical safety valve?
  21. #60 Of the many impurities commonly found in marine lubricating oil, which of the following CANNOT be removed by a centrifugal purifier at normal operatin...
  22. #61 Which of the listed substances can be satisfactorily removed from diesel fuel by centrifuging?
  23. #63 For optimum results, centrifugal purification of heavy fuel oil should be accomplished with the fuel at the lowest practicable __________.
  24. #66 By what means is biological sewage treatment plant effluent disinfected before discharge overboard?
  25. #69 Bottom blow valves are installed on auxiliary water-tube boilers to __________.
  26. #71 The tube sheets installed in a fire-tube auxiliary boiler are normally connected by __________.
  27. #72 The primary function of a flame safeguard system, as used on an automatically fired auxiliary boiler, is to prevent __________.
  28. #76 Back injuries are one of the most common injuries that result in lost work time. What is the proper technique for lifting an object?
  29. #80 What type of respiratory protection provides the greatest protection from the various respiratory hazards, is specifically designed for emergency and...
  30. #81 The size of ball and roller bearings can be identified by the __________.
  31. #82 Which of the following statements describes the characteristics of precision manufactured roller bearings?
  32. #83 Which of the listed types of bearings is an example of a half bearing?
  33. #86 Why do roller bearings have higher loading capacities than ball bearings?
  34. #87 In a compression type automatic grease cup, the lubricant is forced into the bearing by __________.
  35. #88 To ensure adequate lubrication and to prevent a high operating temperature, the recommended amount of grease injected into a ball or roller bearing is...
  36. #89 Machinery with ball bearings designed to be filled with grease should have the relief plug temporarily removed while grease is being added. This plug...
  37. #90 When replacing ball bearings on an electric motor shaft, you should __________.
  38. #91 Which of the listed tools should be used to remove a tapered roller bearing from a shaft?
  39. #92 Which of the following statements is correct concerning antifriction bearings installed on pumps?
  40. #93 Packing extremely soft grease into a roller bearing will cause __________.
  41. #94 A ball bearing will overheat if __________.
  42. #95 What material is most commonly used as a sacrificial anode for the purposes of minimizing the galvanic corrosion of steel and cast iron?
  43. #96 When an aluminum plate is bolted to a steel plate, what is required at the bolted joint to minimize bimetallic corrosion?
  44. #97 Before primers and finish coats may be applied to a metal surface, the surface must be properly prepared. What statement is true concerning surface pr...
  45. #98 In preparing the surface of a metal for application of primers and finish coats, which of the listed hand tools is appropriate for surfaces with signi...
  46. #99 What is meant by the term "boxing" paint?
  47. #100 When applying paint with a brush, which of the following pairs of techniques are recommended?
  48. #101 When installing DANGER tags when performing a tag-out and lock-out procedure in preparation for accomplishing maintenance, what is the color of these...
  49. #102 Under what circumstances could equipment be operated when tagged with DANGER tags?
  50. #108 What statement is true concerning the polishing coalescer filter of an oily-water separator?
  51. #110 Which of the listed characteristics of fuel oil establishes the danger point as far as transferring, pumping, and firing procedures are concerned?
  52. #111 Which characteristic of fuel oil is the most significant when determining the temperature to which the fuel oil must be heated for proper atomization?
  53. #113 The BTU value of fuel oil is determined by a/an __________.
  54. #116 In what application is a remote valve operator most likely to be located outside the machinery space when the valve itself is located within the machi...
  55. #121 On a ship with a continuously manned engine room, ratings may form part of the engineering watch. For engine room watch ratings, what is the customary...
  56. #122 In terms of the personal safety of an engine room watch standing rating, which alarm response would be the most immediately critical?
  57. #123 Setting up a welding job, where the work is the positive pole and the electrode is the negative pole for the arc, is known as a/an __________.
  58. #133 Solder is an alloy of __________.
  59. #135 Tinning a soldering iron will __________.
  60. #136 Flux is used when soldering, in order to __________.
  61. #137 The purpose of annealing any metal is to make the metal __________.
  62. #138 The ability of a metal to be hammered, or rolled out is called its __________.
  63. #139 When hardened metal is heat-treated by a process known as tempering, what metallurgical properties are achieved?
  64. #140 Ferrous metals are metals containing __________.
  65. #141 Reheating a hardened component to a temperature lower than the hardening temperature and then cooling it is known as __________.
  66. #144 To obtain a 1/2 inch per foot taper on an 18 inch work piece, the tailstock of the lathe must be set over __________.
  67. #145 Which of the following statements represents the difference between a four-jaw independent chuck and a three-jaw universal chuck?
  68. #146 A tailstock 'dead center' has been given that name because it __________.
  69. #148 For proper support when turning a long thin piece of work between lathe centers, you should use a __________.
  70. #150 Work that cannot readily be mounted between lathe centers is usually held in a __________.
  71. #159 The main difference between a common lathe dog and a safety lathe dog is that the latter __________.
  72. #165 A micrometer screw has a pitch of __________.
  73. #167 To check the thickness of a piece of thin shim stock before using it to make a bearing shim, you should use a __________.
  74. #168 The most accurate method of measuring the setting of an inside caliper is to use a/an __________.
  75. #169 Many micrometers are equipped with a ratchet stop at the end of the thimble to __________.
  76. #172 The correct torque value for a micrometer torque wrench is reached when __________.
  77. #174 Which of the listed types of files is the best for producing a fine finish on metal?
  78. #176 Which of the following types of files is generally used for finishing?
  79. #177 A metal file has become clogged with filings and should be cleaned with a file __________.
  80. #178 Double cut files are most effective when used for __________.
  81. #179 Heavy pressure on the ends of a file will cause the work surface to become __________.
  82. #180 To properly install a new blade in a hand hacksaw frame, the __________.
  83. #181 Proper hacksaw cutting is accomplished when pressure is applied only on the __________.
  84. #182 When coming to the end of a cut using a hand hacksaw, you should __________.
  85. #186 To cut angle iron and heavy pipe with a hand hacksaw, you should use a blade with what number of teeth per inch?
  86. #187 The term referring to the number of teeth per inch on a hacksaw blade is known as the __________.
  87. #189 A hacksaw blade will start a cut more easily if you __________.
  88. #190 A hacksaw blade will break if __________.
  89. #191 Open end wrenches are __________.
  90. #192 A pipe, or Stillson wrench functions best when __________.
  91. #193 Large size pipe can be easily rotated with a __________.
  92. #194 Needle nosed pliers are best used to __________.
  93. #195 Which of the wrenches listed practically eliminates the possibility of its slipping off while tightening a nut or bolt?
  94. #196 The open end wrench size for a 3/4 inch American National Standard hex head machine bolt is __________.
  95. #198 What precautions should be followed when using a chisel having a mushroomed head?
  96. #199 Which of the listed punches can be properly used to free a tapered pin 'frozen' in its hole?
  97. #200 An aligning punch is commonly used to __________.
  98. #201 A chisel with a mushroom head should not be used because __________.
  99. #202 Diamond point chisels are best used for cutting __________.
  100. #203 Which of the chisels listed should be used for cutting oil grooves?

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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.