Assessment Test

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1. A boiler with a water capacity of 10 tons, generates steam at the rate of 30 tons per hour. If the feedwater concentration of solids was initially 0.5 PPM, and will increase at a rate of 1.5 ppm every hour, what would be the increase in the feedwater concentration of solids after 24 hours?


2. Dissolved oxygen in the condensate is generally attributed to _________.


3. Heating the fuel oil to an excessively high a temperature in a fuel oil heater will cause __________.


4. In a steam turbine and reduction gear main propulsion plant, the alarm sensor for low turbine oil pressure is usually installed __________.


5. What is the significance of pinion deflection in the operation of reduction gears?


6. To comply with Coast Guard Regulations (46 CFR), which type of boiler listed shall be subjected to a hydrostatic test at one and one half times maximum allowable working pressure?


7. A sequential lift, nozzle valve control bar on a turbo generator, utilizes which of the following operating principles?


8. When the boiling temperature of a steam boiler is increased, which of the following effects will occur with relation to the pressure and the specific volume of the steam?


9. Which system should be tested and used when required to raise the water level in an idle boiler?


10. Which of the following represents a significant system limitation to be aware of when a burner management system is operated in the Manual mode?


11. What is normally used to compensate for thermal expansion and contraction of the main turbine casing?


12. Whenever operating a boiler whose economizer is bypassed, always keep in mind that __________.


13. Which of the listed conditions can cause high superheater outlet steam temperature in an automated boiler?


14. When testing boiler flue gas with a chemical absorption apparatus, to obtain accurate results __________.


15. Contaminated steam generators in a contaminated drain system are usually __________.


16. Which of the listed conditions can cause excessively high superheater outlet steam temperature in an automated boiler?


17. When forced draft blowers are provided with high and low speed controls, it is advisable to run the blowers at high speed during maneuvering to __________.


18. The boiler water level begins to fall very slowly due to the sudden failure of a water wall tube. In response to this situation, you should continue the feedwater supply and immediately __________.


19. Coast Guard Regulations (46 CFR) require unfired pressure vessels with manholes to be hydrostatically tested __________.


20. Where reaction turbine blading is fitted with shrouding of end tightened design, which of the following operating parameters must be carefully monitored for efficient turbine operation?


21. Which of the following reaction turbine components listed converts thermal energy into kinetic energy?


22. The purpose of a contaminated steam system is to __________.


23. Which component of a Kingsbury thrust bearing assembly transmits the thrust from the line shaft to the oil film and shoes?


24. No lube oil appearing in the sight glass (bull's eye) of a gravity type system is a positive indication of __________.


25. According to 46 CFR Part 61, which of the following statements is true concerning the inspection of watertube boilers?


26. A flame scanner installed in modern boiler combustion control systems, functions to __________.


27. Which of the following is the advantage of operating a typical closed feedwater system for a marine boiler when compared to an open feedwater system?


28. A primary function of burner atomization steam is to __________.


29. The differential temperature of the main condenser cooling water will be significantly affected by a change in __________.


30. Excessive accumulation of carbon deposits on a boiler burner throat ring and diffuser could result in __________.


31. To accurately measure the amount of wear on a high speed pinion journal bearing with a bridge gage, you must __________.


32. Which of the following statements represents one operational characteristic of a cyclone steam separator?


33. For a gravity type lube oil system, a remote pressure sensing device is installed on the main unit lube oil header to enable the watch engineer to __________. I. determine if there is sufficient lube oil pressure to the main engine II. be certain that the bearings are being adequately lubricated


34. Carbon deposits on the boiler burner throat ring is usually caused by __________.


35. Bi-color remote water level indicators, operate on the principle of __________.


36. Circulation of boiler water to the water wall tubes is maintained by the __________.


37. Which of the following statements is true regarding lube oil coolers used for main steam propulsion systems?


38. Coast Guard Regulations (46 CFR) state that main propulsion water-tube boilers are not required to be fitted with a surface blow off valve if the design pressure is __________.


39. What is the main constituent in fuel oil which determines its heat value?


40. Failure of the fuel oil service pump to maintain fuel oil flow to the burner could be caused by __________.


41. A secondary function of atomization steam in a fuel oil burner is to __________.


42. Air accumulated in the inter-condenser of the air ejector assembly is discharged directly to the __________.


43. Precautions to be observed prior to starting a turbine driven cargo pump, should include __________.


44. An energy loss associated with a reaction turbine, but not an impulse turbine, is __________.


45. Thin tipping is a type of turbine blade design primarily used to __________.


46. What is used to compensate for the increased possibility of blade vibration occurring with impulse turbine blading?


47. Which of the following reaction turbine components listed converts the thermal energy into kinetic energy ?


48. A steam plant is operating at 100% power when the atmospheric drain tank runs dry allowing a large air leakage into the main condenser. Which of the following will occur as a result of this air leakage?


49. Why does air entry into the main condenser reduce the efficiency of the steam cycle?


50. What affect will the emergency plugging of leaking condenser tubes have on the condenser pressure and hot well temperature when returning to normal steam plant sea speed operation?


51. Which of the following statements represents the advantage of using a small diameter boiler tube over a larger diameter tube?


52. Your main propulsion boilers are equipped with a two element feedwater regulating control system. While on watch, you are required to respond to a 'slow' bell from full sea speed. Under these conditions the automatic feedwater regulator will have __________.


53. The net positive suction head of a boiler centrifugal feed pump should be calculated to include the feedwater vapor pressure and the __________.


54. Modern day boiler automation allows bypassing the flame safeguard system to permit a burner to have a trial for ignition period during burner light-off. This period may not exceed __________.


55. The function of downcomers installed in water-tube boilers is to __________.


56. If boiler priming occurs, you should immediately __________.


57. The minimum design height of the DC heater is determined by the __________.


58. While underway at sea, the feedwater inlet temperature to a boiler economizer is determined by the __________.


59. Which of the listed statements is true concerning the application and use of plastic fireclay furnace refractory?


60. A leak in the heating coils of a fuel oil heater will first show up as __________.


61. According to U. S. Coast Regulations (46 CFR), watertube boilers shall be hydrostatically tested on passenger vessels every __________.


62. Circulation of water and the steam/water mixture within a natural circulation boiler is retarded by __________.


63. A vent line is provided on each water box of the main condenser in order to prevent __________. I. insufficient head pressure being developed on the circulating pump discharge II. inadequate heat transfer from developing due to air bound tubes


64. Machinery operating features are designed to help conserve energy. Which of the following will not contribute to a systems thermal efficiency?


65. Coast Guard Regulations (46 CFR) concerning superheater safety valves require that the valve __________.


66. Which of the devices listed is used to convert thermal energy into rotor kinetic energy in a reaction turbine?


67. A suspected leak in an operating fuel oil heating coil is normally confirmed by __________.


68. An increase in clearance between reaction blade tips and the turbine casing will result in __________.


69. In steam turbine and reduction gear units, lube oil coolers installed in the lube oil system are located between the __________.


70. While standing watch, what immediate action should you take if you are running at sea speed and notice a sudden and significant drop in lube oil pressure to the main turbine?


71. A leak in a heating coil in a fuel oil storage tank should be detected quickly by __________.


72. In a segmental pivoted-shoe thrust bearing, the thrust load among the shoes is equalized by the __________.


73. Downcomers are used in modern boilers to __________.


74. The automatic recirculating valve in the main condensate recirculating line is designed to be controlled by which method?


75. Magnets are installed in the main propulsion turbine lube oil pump strainers to attract metal particles released through wearing of __________.


76. If the main lube oil pump fails to build up discharge pressure, the reason could be the __________.


77. Accumulation of fuel oil in the boiler double casing could be caused by __________.


78. One of the functions of a boiler desuperheater installed in a high pressure boiler is to __________. I. maintain the essential flow of feedwater into the drum II. heat the boiler water in the steam drum


79. Downcomers are frequently mounted outside the boiler casing on a water-tube boiler for the purpose of __________.


80. In a marine boiler equipped with mechanically atomized burner assemblies, proper combustion depends on the following, except __________.


81. Discharging an excessive amount of make-up feed water into the DC heater during normal steaming conditions could cause __________.


82. A boiler feed stop-check valve would be located at the __________.


83. Water boxes on main condensers are vented to __________.


84. Fuel oil is transferred to the settling tanks for __________.


85. Because of the pressure drop existing across each diaphragm, the flow of steam between the nozzle diaphragm and the rotor of the turbine is held to a minimum by __________.


86. The boiler economizer provides additional heat to the __________.


87. If a boiler is being operated with the economizer bypassed, which of the following is true?


88. Which of the following conditions will occur when a glassy film forms on the furnace wall due to the burning of fuel oil contaminated with salt water?


89. Carbon deposits on the diffuser and register throat ring of a burner __________.


90. Most auxiliary turbines do not require an external source of gland sealing steam because they __________.


91. A check valve is located between the economizer and the steam drum to __________.


92. Serious tube leaks in the air ejector after condenser assembly may cause __________.


93. Main propulsion steam turbine casing drains generally discharge to the __________.


94. The purpose of the steam control valves installed in the auxiliary exhaust line is to __________.


95. Which of the conditions listed could be responsible for the flame of a mechanical atomizer to blow out when attempting to light off?


96. The boiler main feed stop check valve is located nearest the __________.


97. Which type of bearing lining material is most commonly used in modern precision split type bearings?


98. One factor for determining the minimum feedwater inlet temperature to a boiler economizer is the __________.


99. In addition to a orifice plate, a fuel oil atomizer uses which of the listed parts?


100. When preparing water-tube boilers for hydrostatic testing, they shall be filled with water at not __________.


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