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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 301–400 of 1,128 · page 4 of 12

  1. #597 Hot water heaters used in potable water systems may have multiple heat sources, such as an electric heating element and a jacket water heated tube bun...
  2. #599 Suppose the pressure switch used to control the "lead" potable water pump is set at 45 psig cut-in for pump start and 55 psig cut-out for pump stop. W...
  3. #600 Which of the following speed control devices is used strictly as a safety device to prevent prime mover damage and acts by shutting down the prime mov...
  4. #602 Which of the following statements is true concerning the application for an isochronous governor?
  5. #604 Which term represents the ability of a speed control governor to maintain prime mover speed without hunting?
  6. #607 What is meant by the term "dead band" as it applies to prime mover speed control governors?
  7. #649 The pressure of an operating hydraulic system, as indicated by a pressure gauge, is a result of the fluid flow overcoming __________.
  8. #650 Which characteristic or condition will have the greatest effect on increasing a hydraulic oil's viscosity?
  9. #651 With an increase in temperature, the volume of hydraulic fluid __________.
  10. #652 Energy losses occurring in a hydraulic system are ultimately absorbed by the __________.
  11. #657 For the various sizes of tubing and wall thickness used in a hydraulic system, the inside diameter can be determined if it is remembered that the insi...
  12. #659 The determining factor for the strength of a flexible rubber hydraulic hose is the __________.
  13. #663 Strainers are commonly used in hydraulic systems to __________.
  14. #664 An internal bypass is provided on some hydraulic system suction strainers to help reduce the possibility of __________.
  15. #665 An improperly maintained filter used in a hydraulic system can __________.
  16. #667 In application, which of the listed sealing devices is most similar to an O-ring?
  17. #671 Both the direction of flow and fluid flow rate of a variable displacement radial piston pump are determined by the relative positions of the _________...
  18. #672 To convert a vane type hydraulic pump to a hydraulic motor, which of the following would have to be done?
  19. #673 A hydraulic fluid flow control circuit, controlling linear actuator speed during extension, with the pump operating at system pressure, is known as a...
  20. #675 A hydraulic fluid flow control circuit, used to control linear actuator speed during retraction, with the pump operating at above maximum pressure, is...
  21. #676 If the device shown in the illustration is being used to control the output of an axial piston pump, when part "A" is moved to the right, then part "B... illustration
  22. #683 Plug valves installed in hydraulic systems are most suitable for use as __________.
  23. #685 Which of the listed pressure-control valves would be used in a hydraulic system to temporarily divert some, or all of the pump discharge until the add...
  24. #686 Which of the listed pressure control valves would be used to permit the completion of one action of a hydraulic system before a second action would be...
  25. #689 For which of the following reasons is a linear actuator fitted with a cushioning device?
  26. #690 Which of the following statements concerning the operation of a single-acting hydraulic ram is correct?
  27. #691 The component used in a hydraulic system to store potential energy in the form of hydraulic fluid under pressure, is the __________.
  28. #692 Which of the listed components of a hydraulic system would enable the pump to be temporarily shutdown, and yet still provide an instantaneous source o...
  29. #693 A precharged bladder-type accumulator used in a hydraulic system, can be potentially dangerous if __________.
  30. #694 Which of the following statements describes the functions of a reservoir used in a hydraulic system?
  31. #695 The baffle plate used in the reservoir of a hydraulic system serves to __________.
  32. #696 A reservoir, as used in hydraulic systems aboard ship, is used to store hydraulic oil. Another function is to __________.
  33. #698 In a shell-and-tube type hydraulic fluid cooler, the amount of heat transferred from the hydraulic fluid to the cooling water depends upon __________.
  34. #699 If a hydraulic system is in continuous operation, and is equipped with an air cooled heat exchanger, the fan should __________.
  35. #700 In which of the listed hydraulic systems will the installation of an oil cooler be necessary?
  36. #702 To charge a bladder type hydraulic accumulator __________.
  37. #704 When normal operating pressure is applied to the hydraulic oil in a high-pressure system, the oil __________.
  38. #705 Purging air from a hydraulic system is necessary when __________.
  39. #706 New piping and tubing to be installed in a hydraulic system can be safely degreased by using __________.
  40. #769 As it pertains to safety valves, what is the definition of blow down?
  41. #771 Concerning safety valves, what statement is true?
  42. #773 Which of the following listed valves would require "blow down" to insure proper operation and prevent damage due to repeated and rapid opening and clo...
  43. #783 What statement representing the primary purpose of a steam trap is true?
  44. #787 In order for a steam trap to be effective in accomplishing its intended purpose, what statement is true regarding its installation?
  45. #818 In order for heat transfer to take place between two substances, what essential condition must exist?
  46. #819 What mode of heat transfer is associated with the transport of thermal energy from one location to another by fluid in motion?
  47. #820 What mode of heat transfer is associated with the transport of thermal energy within a body or between two bodies in direct contact?
  48. #822 Overall heat transfer processes often involve two or more modes of heat transfer. Specifically, when heat is being transferred from one side of an air...
  49. #823 What statement is true concerning the heat transfer rates through a heat exchanger boundary wall by conduction?
  50. #824 What statement is true concerning heat transfer rates by the heat transfer mode of natural convection?
  51. #825 What statement represents the first law of thermodynamics?
  52. #826 What statement represents the second law of thermodynamics?
  53. #827 If Boyles' law describes the relationship between the pressure and volume of ideal gases, what statement is true?
  54. #828 If Charles' law describes the relationship between the temperature and volume of ideal gases, what statement is true?
  55. #829 What term is defined as the quantity of heat necessary to raise the temperature of a unit mass of a substance one degree?
  56. #830 What statement represents the ideal gas law?
  57. #831 What term is defined as the amount of heat required to convert a unit mass of a substance from a liquid to a vapor at constant temperature and pressur...
  58. #832 What term is defined as the rate of doing work?
  59. #833 What statement is true concerning thermal energy in transition?
  60. #834 What statement is true concerning the internal energy of a substance?
  61. #837 Which of the following propulsor types represents the proper terminology for a screw propeller of the conventional design?
  62. #838 When an electricity generating plant features shaft-driven generators, what type of propulsor is generally used for main propulsion?
  63. #839 Which of the following propulsor types would be used with unidirectional propulsion shafting rotation?
  64. #840 What type of propeller consists of a flat disc set flush with the under surface of the vessel's hull with a number of vertical, rudder like blades pro...
  65. #842 Which of the following propulsor types represents the proper terminology for electric propulsion where the drive motors are outside the ship's hull?
  66. #843 Concerning the operating mechanism of a controllable-pitch propeller, what statement is true?
  67. #844 Which of the following propulsor types does not require the use of a separate rudder for steerage?
  68. #845 If a main propulsion shafting arrangement is such that no strut or strut bearing is required, what is an alternative name given to the propeller shaft...
  69. #846 What statement is true concerning the lubrication of line shaft bearings?
  70. #847 What statement is true concerning the ability of a line shaft bearing to adapt to shaft misalignment as the ship's hull flexes?
  71. #848 Which line shaft bearing is most likely to have both upper and lower half bearing shells on merchant ships?
  72. #849 Concerning the arrangements of a disk-oiled line shaft bearing, what statement is true?
  73. #850 What statement is true with respect to the back of a propeller blade?
  74. #851 What is meant by the term "left-handed" propeller?
  75. #853 Concerning transverse fixed tunnel thrusters, what statement is true?
  76. #854 Concerning steerable internal duct thrusters, what statement is true?
  77. #855 With respect to the vectoring ring of a steerable internal duct thruster, what statement represents the operating principle of the vectoring ring?
  78. #856 What statement represents the fundamental difference between an azimuthing thruster and a podded propulsor?
  79. #857 With respect to a "pusher" type azimuthing thruster, what statement is true?
  80. #860 What type of propulsor is typically used in electric motor driven, transverse, tunnel bow thrusters to limit the starting current of the single speed...
  81. #861 What is the primary advantage of transverse bow and stern tunnel thrusters when installed on ships?
  82. #862 Which set of operating conditions would be most problematic in terms of the deterioration of the insulation resistance of the drive motor of an electr...
  83. #863 The gears used for virtually all marine propulsion reduction gear sets are of what type?
  84. #864 Of the following propulsion modes, which one would operate with a geared-drive featuring a single reduction?
  85. #865 What is an example of an epicyclic gear?
  86. #866 For a parallel axis single reduction gear, what statement is true?
  87. #867 Which of the listed reduction gear sets has the input and output shafts in-line with one another?
  88. #869 Which of the following couplings or clutches allows, within limits, a certain degree of slip?
  89. #870 Concerning main propulsion reduction gears, what statement is true?
  90. #871 What is a shipboard application for a worm gear drive?
  91. #872 Of the following propulsion modes, which one would operate with a geared-drive featuring a double reduction?
  92. #873 The basic function of the centrifugal pump impeller is to __________.
  93. #874 The primary function of a centrifugal pump volute is to __________.
  94. #875 Which of the following statements is true concerning centrifugal pumps?
  95. #877 Which of the listed types of seals is used effectively for pumps handling toxic or highly flammable liquids that cannot be permitted to escape into th...
  96. #878 Which of the listed parts is used in a lobe-type rotary pump to allow for wear on the lobe edges?
  97. #879 One disadvantage of using a mechanical shaft seal instead of mechanical packing is that __________.
  98. #884 The output volume of a positive fixed displacement pump can be changed only by __________.
  99. #886 What should be done if localized scoring is discovered on a pump shaft sleeve during routine maintenance inspection?
  100. #887 When repacking a stuffing box fitted with a lantern ring, which of the following precautions should be observed?

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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.