Assessment Test


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1. Prior to rolling the main turbines in preparation for getting underway, you should __________.

 
 
 
 

2. After properly lining up the main propulsion turbine for warm up, steam should first be admitted to the rotor through the ________.

 
 
 
 

3. When a turbine rotor is not rotating during maneuvering, the heat tends to be concentrated at the __________.

 
 
 
 

4. With vacuum up and the main propulsion turbine standing by while awaiting engine orders, it is necessary to roll the unit alternately ahead and astern every five minutes to __________.

 
 
 
 

5. To stop the rotor of a main turbine while underway at sea you should __________.

 
 
 
 

6. To prevent damage to the turning gear mechanism, which of the following procedures must be carried out before the turning gear is engaged?

 
 
 
 

7. A common cause of the Babbitt linings cracking in a turbine journal bearing is from ________.

 
 
 
 

8. If steam is admitted to the main propulsion turbine with the jacking gear engaged, which of the following problems can occur?

 
 
 
 

9. Excessive thrust bearing wear in a main propulsion turbine rotor should FIRST become apparent by __________.

 
 
 
 

10. Raising vacuum on a main turbine unit without using the turning gear will result in __________.

 
 
 
 

11. The original bridge gage reading for a reduction gear bearing was measured as .008 inches. A year later, the bridge gage reading for the same bearing is .010 inches. This indicates __________.

 
 
 
 

12. If the main propulsion turbine begins to vibrate severely while you are increasing speed, you should __________.

 
 
 
 

13. If oil is found in the main fuel oil heater steam drain system, which of the actions listed should be taken first?

 
 
 
 

14. Testing boiler water for chloride content will indicate the amount of __________.

 
 
 
 

15. A sample of boiler water can be chemically tested for alkalinity by initially adding a few drops of phenolphthalein and then slowly titrating the water sample until the __________.

 
 
 
 

16. Phenolphthalein is used as an indicator to test boiler water for __________.

 
 
 
 

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

 
 
 
 

18. Calcium minerals in boiler water are precipitated out of solution by the use of which of the listed chemicals?

 
 
 
 

19. Although accurate tests of boiler water for dissolved oxygen are difficult to obtain on board ship, you can be fairly certain of proper oxygen removal by __________.

 
 
 
 

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

 
 
 
 

21. To minimize metal corrosion, boiler water is best kept __________.

 
 
 
 

22. If boiler water chemicals are decreasing in one boiler and increasing in the other boiler, while both are steaming at normal rates, a leak probably exists in the __________.

 
 
 
 

23. Carbon dioxide dissolved in boiler water is dangerous in a modern power boiler because the gas __________.

 
 
 
 

24. Excessive alkalinity of boiler water will cause ________.

 
 
 
 

25. Excessive carbon dioxide formed by improper chemical treatment in the boiler may cause corrosion in the __________.

 
 
 
 

26. A malfunction in the DC heater is indicated by __________.

 
 
 
 

27. Flame scanners are used with boiler combustion control systems to monitor flame quality and to __________.

 
 
 
 

28. The photoelectric cell installed as part of the combustion safety controls of an automatically fired boiler will __________.

 
 
 
 

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

 
 
 
 

30. In automatic combustion control systems, increasing or decreasing a loading pressure by a set amount is called

 
 
 
 

31. As found in a basic pneumatic automatic combustion control system, the function of a standardizing relay is to __________.

 
 
 
 

32. In an automatically fired boiler, the steam pressure regulator controls the supply of fuel oil to the burners by responding to variations in the __________.

 
 
 
 

33. Fine adjustments to a boiler combustion control system, to bring about near perfect combustion, should be made by manually adjusting the __________.

 
 
 
 

34. If an automatically fired burner ignites, but repeatedly goes out within two seconds, the cause could be a/an __________.

 
 
 
 

35. 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 ______.

 
 
 
 

36. In a boiler automation system, if a burner fuel oil solenoid valve continually trips closed under normal steaming conditions, you should __________.

 
 
 
 

37. While your vessel is steaming with one boiler, the automatic combustion control system sensing line for the idle boiler is accidentally opened. How will this affect the steaming boiler?

 
 
 
 

38. While trying to light off a burner on a semi-automated boiler, you note that the fuel oil solenoid valve at the burner will not stay open. Which of the following conditions could cause this problem?

 
 
 
 

39. 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?

 
 
 
 

40. Which of the precautions listed should be taken when gagging a boiler safety valve?

 
 
 
 

41. Which of the listed operating practices is considered as safe, and should be followed when opening and inspecting the waterside of a boiler?

 
 
 
 

42. If a major flareback occurs to a boiler, which of the following actions should be immediately taken?

 
 
 
 

43. Which of the following actions should be carried out if the boiler water level is falling due to a tube failure?

 
 
 
 

44. Which action should be taken if the water level in the boiler gage glass drops out of sight and the burners fail to secure automatically?

 
 
 
 

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

 
 
 
 

46. While underway, the boiler water level in a steaming boiler begins dropping rapidly and cannot be kept at the normal level by standard practices. The engineer's next action should be to __________.

 
 
 
 

47. Under EMERGENCY operating conditions, the proper valve positions for controlling feed water to the boiler should be the __________.

 
 
 
 

48. In the event of a failure of the pneumatic control system, a multi-element feed water regulator is designed to operate as a __________.

 
 
 
 

49. One boiler of a two boiler plant has ruptured a tube and the water cannot be maintained in sight in the gage glass. After securing the fires, your next action should be to __________.

 
 
 
 

50. When preparing to hydrostatically test water-tube boilers, you should __________.

 
 
 
 

51. Which of the following statements is true concerning boiler inspections?

 
 
 
 

52. According to 46 CFR Part 61, which of the following statements is true concerning the inspection of water-tube boilers?

 
 
 
 

53. Which of the following statements represents the Coast Guard Regulation regarding a boiler installation in which the superheater outlet temperature exceeds 850°F?

 
 
 
 

54. Which of the Coast Guard publications listed contain the information regarding allowable repairs to boilers installed on cargo vessels?

 
 
 
 

55. According to Coast Guard Regulations (46 CFR), which of the following is classified as a boiler mounting?

 
 
 
 

56. 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 __________.

 
 
 
 

57. Coast Guard Regulations (46 CFR Part 56) permit copper pipe to be used for steam service subjected to a maximum pressure and temperature of __________.

 
 
 
 

58. Coast Guard Regulations (46 CFR) regarding hydrostatic testing of main steam piping state that

 
 
 
 

59. According to Coast Guard Regulations (46 CFR), which of the following steam piping conditions, subjected to main boiler pressure, is exempted from hydrostatic testing?

 
 
 
 

60. If the maximum steam generating capacity of a boiler is increased Coast Guard Regulations (46 CFR) require that the safety valve's __________.

 
 
 
 

61. Coast Guard Regulations, 46 CFR Part 54, require steam safety and relief valves to be provided with a substantial lifting device, capable of lifting the disc from its seat at what percentage of the set pressure?

 
 
 
 

62. Coast Guard Regulations (46 CFR) require that the final setting of boiler safety valves be conducted in presence of the __________.

 
 
 
 

63. The MAWP of a boiler is 900 psi and the normal drop across the superheater is 20 psi. If the superheater safety valve is set to lift at 825 psi, the minimum settings of the drum safety valves allowed by Coast Guard Regulations would be _______.

 
 
 
 

64. 3.7.13.3-5) A boiler superheater safety valve is set to lift at 450 psi (3102 kPa). Coast Guard Regulations (46 CFR) require that if there is a pressure drop of 10 psi (69 kPa) across the superheater, the drum safety valve should set to lift at a pressure of __________.

 
 
 
 

65. The safety valve nominal size for propulsion boilers and superheaters must be not less than 1 1/2 inches and not more than 4 inches. The term 'nominal size' refers to the __________.

 
 
 
 

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

 
 
 
 

67. Coast Guard Regulations (46 CFR) concerning marine boilers, require the installation of a safety valve on the __________.

 
 
 
 

68. Coast Guard regulations require that the relieving capacity of boiler safety valves must be checked __________.

 
 
 
 

69. Coast Guard Regulations (46 CFR) permit repairs and adjustments to boiler safety valves while installed on a main propulsion boiler and may be made by ________.

 
 
 
 

70. Coast Guard Regulations (46 CFR) require the duplex fuel oil discharge strainers installed in boiler fuel oil service systems to be __________.

 
 
 
 

71. Coast Guard Regulations (46 CFR Part 56) require that new fuel oil service piping between pumps and burners be subjected to __________.

 
 
 
 

72. Coast Guard Regulations (46 CFR) require that quick-closing valves on a fuel oil service system should be installed as close as is practicable to the __________.

 
 
 
 

73. In accordance with Coast Guard Regulations (46 CFR) all fuel oil service piping in the vicinity of the burners must __________.

 
 
 
 

74. Coast Guard Regulations (46 CFR) for boiler fuel oil service systems require __________.

 
 
 
 

75. According to Coast Guard Regulations (46 CFR), which of the following is permitted in boiler fuel oil service system discharge piping?

 
 
 
 

76. All oil-fired main propulsion burners with automatic safety control systems must automatically close the burner valve when _________.

 
 
 
 

77. Coast Guard Regulations (46 CFR) require that the design pressure of an economizer integral with the boiler and connected to the boiler drum without intervening stop valves shall be at least equal to __________.

 
 
 
 

78. When a boiler economizer is fitted with a valved bypass, Coast Guard Regulations (46 CFR) require which of the following devices to be installed?

 
 
 
 

79. According to Coast Guard Regulations (46 CFR), feed water nozzles shall be fitted with sleeves, or have other suitable means employed to reduce the effects of temperature differentials on all boilers designed for operating pressures of __________.

 
 
 
 

80. Journal bearings used with modern turbine rotors are manufactured in two halves in order to __________.

 
 
 
 

81. The adjustable spherically seated self-aligning bearing housings used in main turbines are provided with oil deflector rings. The function of these rings is to __________.

 
 
 
 

82. On a main propulsion turbine bearing, the readings obtained with a bridge gage represent the __________.

 
 
 
 

83. Main steam turbine bearings are lined with __________.

 
 
 
 

84. For a large main propulsion turbine, the most commonly used turbine thrust bearing is the __________.

 
 
 
 

85. An efficient seal is normally obtained between the upper and lower halves of a turbine casing by __________.

 
 
 
 

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

 
 
 
 

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

 
 
 
 

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

 
 
 
 

89. The purpose of the sentinel valve installed on a turbine casing is to __________.

 
 
 
 

90. The astern element of a main propulsion turbine is usually designed as a/an

 
 
 
 

91. Labyrinth seals used to reduce leakage around a turbine shaft are constructed of __________.

 
 
 
 

92. When turbine rotor shafts extend through the casing, an external source of sealing steam is used in conjunction with labyrinth packing to __________.

 
 
 
 

93. The labyrinth seals used on rotating steam turbine shafts reduces external leakage by causing

 
 
 
 

94. Labyrinth packing rings are installed on turbine diaphragms to minimize

 
 
 
 

95. Where are moisture shields located in a main propulsion steam turbine?

 
 
 
 

96. The jacking/turning gear mechanism of a main propulsion geared turbine installation is normally connected through mechanical linkage to the _______.

 
 
 
 

97. The jacking gear on main propulsion turbines can be used to __________.

 
 
 
 

98. The main propulsion shaft turning gear usually connects to the free end of the high- speed high pressure pinion because the __________.

 
 
 
 

99. Which of the devices listed is generally used to engage the main engine turning gear to the high pressure turbine high-speed pinion?

 
 
 
 

100. Before placing the jacking gear in operation on a main turbine unit, you must always insure that __________.

 
 
 
 


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