competence 9.2

通報

問題一覧

59. Worn main bearings will cause the compression ratio of an auxiliary diesel engine to?

•decrease

60. After how many hours would you consider changing the turbocharger bearings, even though all appears to be normal?

•12000 hours

61. While your standing your engine room watch at sea, you notice the D.C. heater level dropping rapidly as indicated by the remote level indicator. Which of the following actions should be taken?

•Open the make-up feed valve bypass and check the condenser level immediately.

62. Too high exhaust gas temperature in all cylinders is cause by the following except?

•stuck-up fuel injection pump

63. Putting additives into diesel engine cooling water is primarily designed to prevent?

•scaling

64. An advantage of aluminum pistons, when compared to cast iron piston is?

•better heat conductivity

65. With an increase in temperature, the volume of hydraulic oil,

•increases

66. When the pressure on a compound gage is released, the gage pointer is returned to zero psig by action of the?.

•Bourdon tube

67. What is the fusion of two metals joined together to produce a strong bind as one metal?

•Welding

68. When arc welding, the flux that covers the electrode is used to

•reduce oxidation

69. Which of the following statements concerning cylinder liner wear in a single acting diesel engine is correct?

•Excessive liner wear causes wear between piston rings and grooves.

70. What is caused by restrictions occurring in the small orifices of pneumatic control system components?

•Moisture in the compressed air supply

71. Some fluid filters used in hydraulic systems are designed to cope with increasing pressure differentials by ?

• automatically bypassing the fluid via an internal valve arrangement

72. What dou call a component used to thoroughly small, fine, dust-like particulate contamination from hydraulic fluid?

•Filter

73. Below are some of the causes of high exhaust gas temperature except?

•poor quality of fuel oil

74. The longer the ignition delay period resulting from improper use of low cetane fuel, the ?

•more rapid the rise in combustion pressure

75. A roller bearing should normally be filled to what fraction of its space cavity?

•1/3 to 1/2

76. A properly honed diesel engine cylinder liner will ?

•shorten the ring break-in period

77. What size of the circular bar is required to make a hexagonal nut of 16mm sides?

•16 mm

78. When normal operating pressure is applied to the hydraulic oil in a high pressure system, the oil ?

viscosity will increase

79. Which of the listed devices is often clutched to the flywheel of small and medium size diesel engines for the purpose of starting?

•Air motor

80. The best way to recondition a defective fuel injector is to ?

•send to the nearest authorized repairer

81. Which of the following refers to the distance between the piston top at BDC and TDC?

• The stroke

82. The tool used to make up connection fittings for small diameter copper tubing is called alan_

•flaring tool

83. What is the principal or main hazard to personnel when a diesel nozzle tester is in use?

•Blood poisoning

84. The insulation and screen of diesel engine exhaust manifold shoul be put back after each overhaul because it?

•protects engine personnel from burns due to accidental contact

85. What is the complete tool used for manually cutting threads on pipe ?

•stock and die

86. Which one of the following tool used in precision work to smooth or enlarge a slightly undersized hole?

•reamer

87. What power is required in maintaining the hydraulic consumer system?

•motor

88. An acceptable method of temporary repairs in the vessels hulls is ?

•doubler-plater to be pitted

89. What type of fits is necessary in the assembly of mating parts with the use of hydraulic press?

•interference fits

90. Hydraulic system reservoirs are often fitted with a combined filler/breather cap. What is the effect of a fouled breather element?

•Reservoir is subjected to a partial vacuum

91. What care and attention should be maintained in a hydraulic system after installing a new hydraulic pump in it?

•The filters and strainers should be checked frequently.

92. Where is the charge for an air starting system stored?

•Pressurized tank

93. What type of hydraulic pumps most commonly used in steering systems ?

•volute type

94. High jacket cooling water temperature for all cylinders is caused by ?

•overload engine

95. An O-ring seal in a hydraulic system will begin to leak when it has lost its interference fit due to ?

•ÃI Ã Compression set or wear

96. A leaking suction valve in the second stage of a two stage, high pressure, air compressor can cause excessively high ?

•first stage discharge pressure

97. If during operation and the air compressor pressure will not raise, the probable cause maybe?

•clogged suction air filter

98. To determine the main bearing clearance of a propulsion diesel engine, you should measure the main bearing shell using a ball anvil outside micrometer and measure the crankshaft journal using alan

•outside micrometer

99. Automatic control valves for steam service require periodic maintenance inspections because they .

•continuously throttle steam resulting in wire drawing and erosion of the valve

100. Where does the generator cooling water comes from during dyr-docking?

•culating fore or aft peak tank

101. Modern trnds show that the full flow filters used in multi-operation hydraulic systems would most likely be located

•in the reservoir return line

102. Which of the devices is commonly used in measuring the clearances between the main engine bearings and the crankshaft?

•Plasti-gage

103. Dirty intercoolers on an air compressor will cause?

•increased motor current

104. What will be the effect of an improperly maintained filter used in a hydraulic system?

• Reduce or stop the output action of the actuator

105. To determine the main bearing clearances in a diesel engine, you should use?

• plasti-gage

106. What is the use of strainers in hydraulic systems?

• Prevent solid particles from entering the pump

107. While at sea, during your watchin the engine room of a steam turbine driven vessel, you notice the main lube oil pump suction strainer vacuum differential has been increasing. To correct this you should

•stop the main engine prior to removing the lube oil suction strainer covers, if simply changing over strainers has not proved satisfactory

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

• pump cavitation

109. The leaking valves in a low pressure, reciprocating, air compressor can result from ?

•abrasion by dust and dirt

110. Acetylene should never be used at pressure in excess of 15 psig because,

•slightest backfire could cause an explotion

111. When checking the tightness of nuts and bolts during a diesel engine crankcase and hold-down bolt inspection, the quickest and most effective method is?

•tapping the nuts and bolts with a hammer

112. What causes the possibility of non-atomized fuel dripping from the fuel injection nozzles after injection of the fine fuel mist has finished?

•Defective fuel injector

113. What is the consequence of having a moisture erosion in the last stages of the low pressure turbine?

•Low inlet steam temperature

114. What is the next task after fitted of pipings are welded?

•Clean with water or steam to remove remaining flux.

115. Why would you cut a hole in a boiler tube which has been plugged?

• To prevent pressure build up

116. In which of the listed hydraulic system components could an O-ring seal be satisfactory used in providing a seal?

•Relief valve spool

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