Assessment Test


1. Which of the casualties listed is apt to occur immediately after a high water casualty?


2. Heavy slagging and high temperature corrosion of boiler tubes can result from using a fuel oil with high amounts of __________.


3. Which precaution should be observed to prevent damage to the fuel oil service pump when warming up the fuel service system?


4. The last two digits stamped on a fuel oil atomizer sprayer plate represents the cross-sectional area ratios of the tangential slots and orifice. This ratio determines the __________.


5. In a water-tube boiler, circulation is caused by the difference in the __________.


6. Shrouding on impulse turbine blading is held in place by __________.


7. The means of circulation commonly found in water-tube boilers is __________.


8. Which of the following statements is true concerning the operation of a boiler thermo-hydraulic feed-water regulator?


9. The functions of DC Heater is to __________.


10. A lower than normal boiler stack gas temperature usually indicates __________.


11. The number '29' on a fuel oil burner sprayer plate marked '2909' indicates the __________.


12. Eight (8) ounces of oxygen, dissolved in 500,000 pounds of water, is a concentration of __________.


13. The steam separator as used in conjunction with a steam whistle normally drains to which of the listed drain systems?


14. Allowance for axial expansion of the steam turbine due to temperature changes is provided for by the use of __________.


15. Which of the following statements concerning boiler steam drum surface blow piping is correct?


16. Clean low pressure steam drains are collected in the __________.


17. In a single-element feed water regulator, the amount of valve opening and closing is controlled by the __________.


18. Which statement is true concerning drain inspection tanks?


19. From which of the areas listed are condensate drains normally collected and returned to the low pressure drain system?


20. Economy and efficiency in the operation of a marine boiler have traditionally been characterized by __________.


21. When warming up a fuel oil service system, you should open the steam supply to the fuel oil heaters __________.


22. A dissolved oxygen concentration of 8.0 ppm represents __________.


23. The level in the atmospheric drain tank is normally maintained by the use of a/an __________.


24. In a boiler equipped with a convection type super-heater, the super-heater tubes are located __________.


25. Single-element automatic feed water regulators are controlled by the __________.


26. If live steam is supplied directly to the tank heating coils, the collected drains in the “clean” section of the contaminated drain inspection tank are removed directly to the __________.


27. A light brown haze issuing from the boiler smoke stack generally indicates __________.


28. The entire unit which houses the burner, air scoop, air doors and bladed cone is correctly called the __________.


29. If it should become necessary to abandon a compartment because of the danger of a large steam leak on a boiler, which of the following actions represents the best avenue of escape?


30. The percentage by weight of steam in a mixture of steam and water is called the __________.


31. The correct radial clearances between the rotor and the casing in a propulsion turbine are maintained by the turbine __________.


32. Excessive water flow beyond the design limits of a feed-water heater, will be indicated by a/an __________.


33. The two element boiler feed-water regulator is controlled by __________.


34. A high water level in a deaerating feed heater will cause the automatic dump valve to drain condensate to the __________.


35. As steam accomplishes work in an engine or turbine, the pressure of the steam is reduced because it __________.


36. The greatest single overall loss of efficiency in a marine propulsion steam plant cycle results from __________.


37. The most serious fireside burning of the boiler super-heater tubes is the result of __________.


38. If the theoretical quantity of dry air required to burn one pound of fuel oil is 13.75 pounds, what weight of air will be necessary to burn one pound of fuel to operate a boiler at 10% excess air?


39. As steam accomplishes work in an engine or turbine, it expands and __________.


40. The purpose of the division plates installed in boiler super heater headers is to __________.


41. A two-element feed water regulator responds directly to changes in __________.


42. The DC heater automatic level dump valve is used to __________.


43. Which of the following conditions in a water-tube boiler generating tube could cause tube failure, even if the water gage glass shows the proper level?


44. Efficient combustion in a boiler is indicated by a __________.


45. When seated, the disc of a safety valve has an area of 0.75 square inches (1.9 sq cm). When the valve lifts the area is increased by 10%. If the valve lifts at 300 psig (2170 kPa), at approximately what pressure will the valve reseat?


46. When a boiler water test indicates a pH value of 6, you should __________.


47. In a D-type boiler, which of the tubes listed would be located in the generating tube bank?


48. If water hammer develops while opening the valve in a steam line, which of the following actions should be taken?


49. Two-element feed water regulators operate by sensing __________.


50. High pressure steam drains are normally discharged to the __________.


51. The major heat loss in an oil fired boiler is the heat __________.


52. When securing a boiler, the burner registers are to be left open for a few minutes to __________.


53. In modern reaction turbines, thin tipping is a procedure designed to __________.


54. Boiler screen tubes are used to protect which of the listed components from high furnace temperature?


55. The best conductor of heat in a marine boiler is __________.


56. A two-element feed water regulator reacts to changes in the steam drum water level and the __________.


57. Damage to deck machinery from water hammer developing in the steam lines can be prevented by __________.


58. If the theoretical quantity of dry air required to burn one pound of fuel oil is 13.75 pounds, what is the weight of air per pound of fuel when operating a boiler at 5% excess air?


59. The boiler fuel oil system “hot” strainers are also known as __________.


60. Turbine casing flanges are sometimes provided with a system of joint grooving to __________.


61. A convection type super-heater in a D-type boiler is protected from radiant heat by __________.


62. One of the operating conditions sensed by a two element feed water regulator is __________.


63. In the boiler steam and water system, pressure is highest in the __________.


64. The boiler fuel oil system suction strainers are also known as the __________.


65. On an automatically fired boiler, the loss of forced draft fan will result in which of the listed actions to be carried out?


66. A boiler super-heater support tube differs from a standard generating tube in that the __________.


67. Scavenging air is supplied to steam soot blowers to __________.


68. A two-element feed water regulator not only responds to changes in water level, but is also designed to react to __________.


69. The leakage of air into the pump casing by way of the packing gland of a condensate pump, is prevented by __________.


70. Strainers are installed in boiler fuel oil service lines to __________.


71. Under constant boiler load, the superheated steam temperature may rise above normal for the existing load if __________.


72. A turbine diaphragm functions to __________.


73. Which of the methods listed would be most effective in repairing a steam cut on a seating surface of a super heater hand-hole plate?


74. Which type of feed water regulator listed provides the most effective regulation of boiler water level under all operating conditions?


75. An efficient heat source which has been used for welding and related thermal processes is __________.


76. Another advantage of the oxygen acetylene flame is __________.


77. Propane is heavier than air as it specific gravity is 1.5 in contrast, acetylene is lighter than air with as specific gravity of __________.


78. As an international practice, the connecting nuts on the oxygen coupling are __________.


79. For easy identification, nuts and connection stub for acetylene are __________.


80. Connecting nut for gas welding hose which is left-hand threaded and marked with a groove is designed for __________.


81. Accidental connection of wrong gas is prevented by the different design of the male/female connection for oxygen acetylene and in addition, the connecting sleeves are color coded with __________.


82. In gas welding, a phenomenon that occur when the speed of combustion at one or more places in the flame hole becomes greater than the speed of gas flow, allowing the flame to burn back into the blow pipe is known as __________.


83. Backfire and sustained backfire are various types of __________.


84. If the sustained backfire is not quickly interrupted in gas welding it will result __________.


85. When the flow of oxygen reverses into the acetylene hose so that an explosive mixture is present in the hose, mostly this is caused by __________.


86. The reverse flow of oxygen into acetylene hose may caused flashback when torch is lighted, this explosive mixture can be ignited by __________.


87. Which of the following is not incorporated to the safety function of flashback arrestors?


88. Generally, where should you expect to find the greatest amount of wear on a cylinder liner?


89. In diesel engineering practice, the term used to express the ignition quality of a particular fuel is __________.


90. Which of the following statements is correct concerning a typical shipboard multi-coil refrigeration system?


91. Which of the listed punches can be properly used to free a tapered pin “frozen” in its hole?


92. If a centrifugal pump is being driven by a steam turbine and the discharge valve is closed off, the pump will __________.


93. Which of the listed types of bearings is an example of a half bearing?


94. When using a one inch micrometer, a reading of .875 is equal to __________.


95. The process of grinding or shredding sewage into smaller particles is known as __________.


96. Which of the devices listed is found on an LP main propulsion steam turbine casing?


97. Which of the listed numeric values represents the smallest size drill?


98. In a steam propulsion plant, the primary source of auxiliary exhaust steam is from the __________.


99. Which of the operating principles listed would apply to a single-element, thermo-hydraulic, feed water regulator?


100. Main condensate re-circulating systems are primarily intended to __________.


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