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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 401–500 of 1,128 · page 5 of 12

  1. #888 When installing a mechanical shaft seal on a pump, it is important to ______.
  2. #889 A centrifugal pump gradually develops insufficient discharge pressure. What corrective action is required?
  3. #890 A pump shaft that is bent or distorted should normally be __________.
  4. #891 When renewing spiral packing in a centrifugal pump stuffing box, after the packing is firmly seated, the packing gland nuts should be __________.
  5. #892 The capacity of a gear type rotary pump, when operated at a constant speed, will decrease with an increase in the pump __________.
  6. #893 Why is the discharge pressure of a herringbone gear pump steadier than the discharge pressure of a simple spur gear pump?
  7. #894 How does the viscosity of a fluid being pumped affect the operation of a spur gear pump?
  8. #895 Positive displacement, helical gear pumps are well suited for pumping oil because __________.
  9. #896 The pressure of a liquid leaving the pump can be referred to as the __________.
  10. #897 If the existing vapor pressure is subtracted from the indicated pressure at the pump suction, the remainder is the __________.
  11. #898 A pump is defined as a device that __________.
  12. #899 Which of the following terms is used to identify the pressure of a liquid entering a centrifugal pump?
  13. #900 Water leaking from a pump packing gland is kept away from the bearing housing by the use of __________.
  14. #903 Which of the following statements represents the main difference between a stuffing box gland and a mechanical seal for sealing the shaft of a centrif...
  15. #905 Which of the materials listed is used as the dynamic seal material on mechanical seals installed on most centrifugal pumps used in water service?
  16. #910 Which of the pumping systems listed for use aboard ship will most likely use a propeller type pump?
  17. #912 The suction-force principle of operation is a typical characteristic of __________.
  18. #913 If you have a duplex, single acting, reciprocating pump making 140 strokes/minute with a 3" diameter cylinder, and a 12" stroke with a 94% volumetric...
  19. #914 To safely remove the piston rod packing from the steam end of a reciprocating pump, you should __________.
  20. #915 Which of the lubricants listed is the best to use on a reciprocating pump rod?
  21. #916 The first step when resetting the slide valves on a duplex reciprocating pump is to __________.
  22. #917 When repacking a reciprocating pump with more than four rings of packing, the packing is cut square, installed with the ends abutted, and each succeed...
  23. #918 Which of the listed types of steam end piston rod packing should be used in a steam reciprocating pump?
  24. #919 A spur gear pump should be operated with the discharge valves __________.
  25. #920 Excessive lost motion in the valve mechanism of a duplex reciprocating pump will cause the __________.
  26. #921 When the danger of freezing exists, all steam driven reciprocating pumps and deck equipment should be __________.
  27. #922 An inadequate reciprocating bilge pump discharge is most often caused by __________.
  28. #923 Which of the following conditions would prevent a steam reciprocating pump from delivering its rated capacity?
  29. #924 A pounding noise occurring in one cylinder of a steam reciprocating general service pump could be caused by __________.
  30. #925 When piston rod packing persists in leaking on a reciprocating steam pump, the cause may be __________.
  31. #927 You suspect a problem with the centrifugal fire pump on your ship, and begin to slowly close the discharge valve. Your suspicion is confirmed when the...
  32. #928 A centrifugal bilge pump requires priming __________.
  33. #930 Excessive air leakage into the suction side of a centrifugal pump would be indicated by which of the following operational problems?
  34. #931 A centrifugal pump may fail to deliver water when first started if the __________.
  35. #935 The total length of stroke in a reciprocating steam pump can be adjusted by __________.
  36. #936 Which of the listed reciprocating pump parts control the position of the pilot slide valve?
  37. #937 Which of the listed devices is used to control the admission of steam to the steam cylinder of a reciprocating pump?
  38. #939 Which of the following valve arrangements permits the reciprocating pump liquid piston to take suction from the suction chamber, and simultaneously di...
  39. #940 The three basic parts of any eductor are the nozzle, the suction chamber, and the __________.
  40. #941 A distinguishing feature of an eductor, when compared to other pumps, is the __________.
  41. #942 Which of the following methods applies to how a vacuum is created by a jet pump or an eductor?
  42. #944 The flame screens installed on sewage system tank vents prevent explosions by __________.
  43. #945 If water continues to flow excessively from the device shown in the illustration, the problem is most likely due to __________. GS-0155 illustration
  44. #946 Which type of Marine Sanitation Device (MSD) is used solely for the storage of sewage and flush water at ambient air pressure and temperature?
  45. #947 A constant pressure range is maintained in the potable water system of many vessels by using __________.
  46. #948 If water continues to trickle into the toilet bowl after the device shown in the illustration has apparently closed, the problem is likely due to ____... illustration
  47. #949 A vessel is in compliance with federal regulations regarding the discharge of sewage by __________.
  48. #950 Expansion tanks when used in a ship's low temperature hot water heating system may be of the open or closed type. In a closed type system, what would...
  49. #953 What type of pump is invariably used as a circulator in a hydronic heating system?
  50. #955 What statement is true concerning a one-pipe hydronic heating system?
  51. #956 What statement is true concerning a two-pipe hydronic heating system?
  52. #957 It is absolutely essential that hydronic heating system hot water piping be kept free of air. Assuming that a system is initially properly filled with...
  53. #959 Water hammer in a steam heating system can be caused by __________.
  54. #960 Which of the following guidelines is considered to reflect good design practices for shipboard steam heating systems?
  55. #962 What type of centrifugal fan is characterized by the highest operating efficiency?
  56. #966 What type of heating coil is generally preferred in heating spaces with electronic equipment?
  57. #969 Concerning cargo-hold dehumidification, what statement is true?
  58. #970 Which statement is true concerning a liquid desiccant cargo-hold dehumidification system?
  59. #971 What statement is true concerning a liquid desiccant cargo-hold dehumidification system?
  60. #972 With regard to the cooling and heating coils and humidification and regeneration chambers of a liquid cargo-hold dehumidification system, which statem...
  61. #976 What type of HVAC system is ideally designed to serve a large public space?
  62. #977 What type of HVAC system is characterized by poor air distribution and ventilation and low system heat loads?
  63. #982 What type of HVAC system is characterized by having control dampers in locations other than the outside air supply, outside air exhaust, and recircula...
  64. #991 What temperature associated with the psychrometric properties of air is measured by an ordinary thermometer?
  65. #992 What temperature associated with the psychrometric properties of air is measured with a sling psychrometer?
  66. #1003 Probably the most useful troubleshooting tools used in a predictive maintenance management program for shipboard machinery are vibration meters, analy...
  67. #1004 What is the standard unit of measure for vibration displacement?
  68. #1005 When performing a vibration analysis for rotating machinery, what is essential?
  69. #1007 If a micrometer were opened to a distance of 0.0001 inch, you would say the reading is __________.
  70. #1009 One turn of the micrometer barrel will linearly move the spindle __________.
  71. #1010 To determine the diameter of a small hole, which of the listed tools must be used with inside calipers to get an accurate reading?
  72. #1013 A reading of 0.625 inch on a micrometer with a 2 to 3 inch range would be equal to __________.
  73. #1016 If a bolt or stud were to break off flush at the surface, which of the listed actions would probably be the best first step to begin the process of it...
  74. #1025 To measure the circumference of a piece of pipe, you should use a __________.
  75. #1027 To get an accurate measurement using a 12 inch machinist's steel rule, you should measure __________.
  76. #1030 With regards to the American National Screw Thread nomenclature, 'pitch' is the __________.
  77. #1036 Which of the following is true when comparing the different "class of fit" for machine threads on bolts and nuts?
  78. #1037 As it pertains to the automatic hydraulic brake of a horizontal electro-hydraulic anchor windlass, what statement is true?
  79. #1038 As it pertains to the automatic electric brake of a horizontal electro-mechanical anchor windlass, what statement is true?
  80. #1043 In attempting to start the hydraulic pump drive motor of a horizontal electro-hydraulic anchor windlass, what condition would prevent the electric mot...
  81. #1044 As it pertains to raising and lowering an anchor with a horizontal electro-hydraulic or electro-mechanical anchor windlass, what statement is true?
  82. #1045 As it pertains to the automatic electric brake of a capstan, what statement is true?
  83. #1046 Which capstan drive arrangement requires a flexible coupling between the reduction gear output shaft and the capstan head input shaft?
  84. #1047 Concerning a conventional mooring winch, what statement is true?
  85. #1048 As it pertains to a "constant-tension" mooring winch, what statement is true?
  86. #1052 For an electro-hydraulic cargo-handling pedestal-type deck crane, what event would result in an immediate stop to all crane motions, including slewing...
  87. #1053 What statement is true concerning the door interlock devices associated with a winding drum or traction drive passenger elevator onboard ship?
  88. #1054 What statement is true concerning the platform interlock devices associated with a winding drum or traction drive cargo elevator onboard ship?
  89. #1056 If it is desired to determine the average temperature across a large duct, what thermocouple wiring technique can be used to generate an emf proportio...
  90. #1057 Which of the listed temperature sensors consists of finely coiled wire, such as platinum, where the resistance varies directly with temperature?
  91. #1058 What is the application for a temperature measuring device known as a pyrometer?
  92. #1060 Which of the following direct pressure measuring instruments is most appropriately used for measuring pressures very close to atmospheric pressure suc...
  93. #1061 For a pneumatic transmission system for instrumentation purposes, if a pneumatic pressure indicator has a calibrated scale of 0 to 1000 psig, what wou...
  94. #1062 For an analog electronic transmission system for instrumentation purposes, if an analog pressure indicator has a calibrated scale of 0 to 30 psig, wha...
  95. #1063 For a pneumatic transmission system for instrumentation purposes, if a pneumatic pressure indicator has a calibrated scale of 0 to 5000 psig, what wou...
  96. #1065 In which of the following applications would a mechanical pressure seal be used with a pressure measuring instrument?
  97. #1067 Which of the following direct pressure measuring instruments is most appropriately used for measuring most pressures, typically above 10 psig and is b...
  98. #1068 What is used to protect a direct sensing steam pressure gauge from damage from contact with steam?
  99. #1071 What type of liquid level indicator which senses head or pressure requires a supply of compressed air?
  100. #1072 Which of the following level indicating system sensor types is ideally suited for discrete-level detection as opposed to continuous-level detection?

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