Assessment Test


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1. What prevents the two fluids in a plate type heat exchanger from coming into direct contact with each other and mixing?

 
 
 
 

2. With regard to the flow patterns associated with plate type heat exchangers, which flow pattern is able to achieve counter-flow on opposite sides of each heat exchange plate?

 
 
 
 

3. What is the most common arrangement for a compact heat exchanger such as that used on an air conditioning cooling coil located in a ventilation supply duct?

 
 
 
 

4. When placing a shell-and-tube heat exchanger with a removable tube bundle such as a bayonet-tube heavy fuel oil service heater into service, to avoid thermal shock what statement represents the correct operating procedure?

 
 
 
 

5. When placing a shell-and-tube heat exchanger with a removable tube bundle such as a bayonet-tube heavy fuel oil service heater into service, to prevent water hammer what statement represents the correct operating procedure?

 
 
 
 

6. When taking a shell-and-tube heat exchanger with a removable tube bundle such as a bayonet-tube type heavy fuel oil service heater out of service, to avoid thermal shock what statement represents the correct operating procedure?

 
 
 
 

7. 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 prevent water hammer what statement represents the correct operating procedure?

 
 
 

8. 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 thermal shock what statement represents the correct operating procedure?

 
 
 
 

9. When placing a shell-and-tube heat exchanger such as a jacket water cooler into service, to insure optimal heat transfer what statement represents the correct operating procedure?

 
 
 
 

10. When securing a seawater-cooled shell-and-tube heat exchanger for an extended period of time, what statement represents the recommended operating procedure?

 
 
 
 

11. When shifting heat exchangers such as main engine lube-oil coolers, what statement represents the recommended operating procedure if the shift is to occur during engine operation?

 
 
 
 

12. Suppose a diesel engine is fitted with seawater-cooled lube oil and jacket water coolers. What statement is true concerning the system operating pressures?

 
 
 
 

13. What is the primary indication of fouling of a heat exchanger?

 
 
 
 

14. For soft scale deposits on the inside of the tubes of a seawater-cooled shell-and-tube heat exchanger, what is typically the preferred method of cleaning?

 
 
 
 

15. For stubborn, hard scale deposits on the inside of the tubes of a seawater-cooled shell-and-tube heat exchanger, what is typically the preferred method of cleaning?

 
 
 
 

16. For removal of sludge from in the inside of the shell of a fuel oil heater or lube oil cooler, what is typically the preferred method of cleaning?

 
 
 
 

17. What would be the most likely indication that a plate type jacket water cooler had an internal leak permitting mixing of the two fluids?

 
 
 
 

18. Which saltwater-cooled heat exchanger arrangement and location would be MOST problematic in terms of keeping the seawater side filled?

 
 
 
 

19. Which saltwater-cooled heat exchanger arrangement and location would be the LEAST likely to become air-bound on the seawater side?

 
 
 
 

20. How may a suspected tube leak on a shell-and-tube jacket water cooler most easily be located?

 
 
 
 

21. What would be the most likely indication that a shell-and-tube lube oil cooler had in internal leak permitting mixing of the two fluids?

 
 
 
 

22. Besides a visual inspection upon disassembly, what method can be used to check for suspected leakage through a heat transfer plate of a plate type heat exchanger?

 
 
 
 

23. If a fluorescent dye penetrant and ultra-violet light are used for leak detection on a heat exchanger, what would be the indication of a confirmed leak?

 
 
 
 

24. The pressure of an operating hydraulic system, as indicated by a pressure gauge, is a result of the fluid flow overcoming

 
 
 
 

25. Which characteristic or condition will have the greatest effect on increasing a hydraulic oil's viscosity?

 
 
 
 

26. With an increase in temperature, the volume of hydraulic fluid __________.

 
 
 
 

27. Energy losses occurring in a hydraulic system are ultimately absorbed by the __________.

 
 
 
 

28. 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 inside diameter equals the outside diameter less __________.

 
 
 
 

29. The determining factor for the strength of a flexible rubber hydraulic hose is the __________.

 
 
 
 

30. 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 __________.

 
 
 
 

31. Strainers are commonly used in hydraulic systems to __________.

 
 
 
 

32. An internal bypass is provided on some hydraulic system suction strainers to help reduce the possibility of __________.

 
 
 
 

33. An improperly maintained filter used in a hydraulic system can __________.

 
 
 
 

34. In application, which of the listed sealing devices is most similar to an O-ring?

 
 
 
 

35. A two stage hydraulic pump unit is used to __________.

 
 
 
 

36. Both the direction of flow and fluid flow rate of a variable displacement radial piston pump are determined by the relative positions of the __________.

 
 
 
 

37. To convert a vane type hydraulic pump to a hydraulic motor, which of the following would have to be done?

 
 
 
 

38. A hydraulic fluid flow control circuit, controlling linear actuator speed during extension, with the pump operating at system pressure, is known as a __________.

 
 
 
 

39. A hydraulic fluid flow control circuit, used to control linear actuator speed during retraction, with the pump operating at above maximum pressure, is known as a __________.

 
 
 
 

40. One function of a replenishing pump installed in many pressure-closed hydraulic systems, is to supply fluid flow to __________.

 
 
 
 

41. Compensated flow control, or constant flow valves are used in hydraulic systems to __________.

 
 
 
 

42. Which of the valves listed is NOT considered to be a hydraulic system directional control valve?

 
 
 
 

43. Plug valves installed in hydraulic systems are most suitable for use as __________.

 
 
 
 

44. The purpose of a restrictor valve, as it is used in a hydraulic hatch cover system, is to __________.

 
 
 
 

45. 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 additional flow was required?

 
 
 
 

46. 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 permitted?

 
 
 
 

47. For which of the following reasons is a linear actuator fitted with a cushioning device?

 
 
 
 

48. Which of the following statements concerning the operation of a single-acting hydraulic ram is correct?

 
 
 
 

49. The component used in a hydraulic system to store potential energy in the form of hydraulic fluid under pressure, is the __________.

 
 
 
 

50. Which of the listed components of a hydraulic system would enable the pump to be temporarily shutdown, and yet still provide an instantaneous source of hydraulic force?

 
 
 
 

51. A precharged bladder-type accumulator used in a hydraulic system, can be potentially dangerous if __________.

 
 
 
 

52. Which of the following statements describes the functions of a reservoir used in a hydraulic system?

 
 
 
 

53. The baffle plate used in the reservoir of a hydraulic system serves to __________.

 
 
 
 

54. A reservoir, as used in hydraulic systems aboard ship, is used to store hydraulic oil. Another function is to __________.

 
 
 
 

55. In a shell-and-tube type hydraulic fluid cooler, the amount of heat transferred from the hydraulic fluid to the cooling water depends upon __________.

 
 
 
 

56. If a hydraulic system is in continuous operation, and is equipped with an air cooled heat exchanger, the fan should __________.

 
 
 
 

57. In which of the listed hydraulic systems will the installation of an oil cooler be necessary?

 
 
 
 

58. If you attempt to tighten a leaking hydraulic fitting with pressure on the system, you will __________.

 
 
 
 

59. To charge a bladder type hydraulic accumulator __________.

 
 
 
 

60. How can the chance of contaminating hydraulic fluid be decreased when working on hydraulic systems?

 
 
 
 

61. Other than taking a scale thickness through a zinc plug opening of the water box of a feed water heater of a flash evaporator, what would be the BEST indication for a need to remove scale build-up?

 
 
 
 

62. While circulating heated sulfuric acid through a feed water heater of a flash evaporator for the purposes of scale removal, what would be the indication of the continued presence of scale?

 
 
 
 

63. When should mechanical cleaning of feed water heater tubes be accomplished?

 
 
 
 

64. What procedure can be used to reduce the rate of scale formation on the heating surfaces of a flash evaporator while still maintaining the desired rate of distillate production?

 
 
 
 

65. While circulating heated sulfuric acid through a feed water heater of a flash evaporator for the purposes of scale removal, what would be the indication of successful removal of the scale?

 
 
 
 

66. What is used to prevent contamination of a potable water system supplying a plumbing fixture such as a galley sink from a backup of sewage sanitary drains?

 
 
 
 

67. What type of disinfection system has the disadvantage that it would fail to provide residual disinfectant in the potable water?

 
 
 
 

68. Which of the following desalination plants will always require a sterilizer when providing water to a potable water system?

 
 
 
 

69. Which of the following statements concerning the arrangements of a potable water system is true?

 
 
 
 

70. On most commercial cargo vessels with a relatively small crew size and few users of the potable water system, how is the potable water system pressure maintained?

 
 
 
 

71. What is the primary purpose of the lead-lag arrangement of the two potable water pumps supporting a typical potable water system?

 
 
 
 

72. What design feature is used to minimize potable water wastage associated with hot water distribution piping for a potable water system?

 
 
 
 

73. 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 bundle. What is the primary purpose of such an arrangement?

 
 
 
 

74. What are the operating characteristics of a "waterlogged" potable water system hydro pneumatic header tank that needs to be recharged with compressed air?

 
 
 
 

75. 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. What would be an appropriate setting for the "lag" potable water pump?

 
 
 
 

76. 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 mover?

 
 
 
 

77. Which of the following statements is true concerning the application for an isochronous governor?

 
 
 
 

78. Concerning governor speed-droop, what statement is true?

 
 
 
 

79. Which term represents the ability of a speed control governor to maintain prime mover speed without hunting?

 
 
 
 

80. Which term represents the how rapidly a speed control governor will complete a corrective action as the result of a load change?

 
 
 
 

81. What is meant by the term "hunting" as it applies to prime mover speed control governors?

 
 
 
 

82. What is meant by the term "dead band" as it applies to prime mover speed control governors?

 
 
 
 

83. What is statement is true concerning the term "isochronous" as it applies to prime mover speed control governors?

 
 
 
 

84. The general purpose of a heat exchanger is to __________.

 
 
 
 

85. With regard to the relative flow patterns through the tubes and the shell of shell-and- tube heat exchangers, what statement is true?

 
 
 
 

86. With regard to the number of passes through the tubes of shell-and-tube heat exchangers, what statement is true?

 
 
 
 

87. If a heat exchanger is designed to cool lubricating oil using sea water as a cooling medium, what statement is true?

 
 
 
 

88. If a heat exchanger is designed to heat heavy fuel oil using steam as a heating medium, what statement is true?

 
 
 
 

89. If a heat exchanger is designed to evaporate sea water using diesel engine jacket water as an evaporating medium, what statement is true?

 
 
 
 

90. If a heat exchanger is designed to condense refrigerant vapor using central cooling fresh water as a condensing medium, what statement is true?

 
 
 
 

91. What type of flow pattern would be associated with a forced-convection finned-coil heat exchanger such as an air-cooled hydraulic oil cooler?

 
 
 
 

92. If a seawater-cooled shell-and-tube lubricating oil cooler has the seawater inlet and outlet connections on the opposite end water boxes, in terms of the number of passes, what statement is true?

 
 
 
 

93. If both the shell-and-tube lube oil cooler and shell-and-tube jacket water cooler of a diesel engine are seawater cooled, what statement is true?

 
 
 
 

94. Which of the following provisions for thermal expansion for shell-and-tube heat exchangers only requires a single tube sheet located at one end?

 
 
 
 

95. Which of the following provisions for thermal expansion for shell-and-tube heat exchangers has a tube arrangement featuring a "tube-within-a-tube"?

 
 
 
 

96. In a shell-and-tube heat exchanger, which of the following tube types would be LEAST susceptible to tube-side fouling?

 
 
 
 

97. For a given shell diameter and tube sizes for a shell-and-tube heat exchanger, which tube pitch pattern would be the most compact design allowing for the most tubes?

 
 
 
 

98. For a shell-and-tube heat exchanger, which tube pitch pattern would feature "see- through" lanes and would most easily allow external mechanical cleaning of the tubes?

 
 
 
 

99. Concerning the baffles of a shell-and-tube heat exchanger, what statement is true?

 
 
 
 

100. For marine-type shell-and-tube heat exchangers, what is the most common arrangement for baffles?

 
 
 
 


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