competence 5.3

53問 • 1年前

問題一覧

51. What is used to supply the energy to compress and move low pressure compressible fluids or gases through a trunking system?

Fan

52. A common type of air heater used in sectional header marine boilers is the .

gas tubular type

53. A multistage centrifugal pump can be BEST described as having

two or more impellers housed together in one casing and mounted on a single shaft

54. In a main propulsion turbine installation, the condensate pump initially discharges to the .

air ejector condenser

55. What is the reason why a positive displacement which a helical gear pumps are well suited for pumping oil?

They are essentially self-priming and capable of a high suction lift.

56. If the fuel oil temperature in the fuel oil heater attains an excessive temperature, what will happenwhat will happen?

Carbon deposits will build up on the heating surfaces

57. By which of the methods listed is the recirculating valve in the main condenser recirculating line designed to be controlled?

Thermostat

58. Air removed from the main condenser is vented to the atmosphere through the .

aftercondenser

59. The way to dispose the bilge slop on an ocean going ship having an inoperative oily water separator.is by

Holding its slops onboard until they can be discharged to a shoreside reception facility.

6. What parts of Oil Discharge monitoring and control system used to analyze the content of oil in the water that is to be discharged overboard ?

An Oil content meter

60. Design characteristics of a velocity-compounded impulse turbine include the utilization of .

a single pressure stage with two or more velocity stages

61. Part of the centrifugal disc purifier use to hold discs in place and directs the flow of dirty liquid to the bottom then to the discs as the oil flows upward is called

Distributor

62. In the fixed vane type emergency fire pump priming vacuum pump. After one week fire pump was not taking suction. The vacuum pump is engaging, but not developing vacuum in the suction side. What might be the cause?

Suction filter of the pump clogged.

63. Gate valves should not be used for throttling as

wire drawing of the disc will result

64. Demulsibility of a lube oil is defined as

the ability of oil to separate from water

65. When a nozzle tester is being used to test a Oclocka type fuel injection nozzle, a clogged nozzle orifice will be indicated by a

distorted spray pattern

66. When heating fuel oil used in main propulsion boilers aboard ship, the flash point may be exceeded only when.

it is required for proper atomization

67. Discharge of oily mixtures from machinery space bilges of tankers is prohibited except when, amongst other requirement, which of the following equipment is fitted?

Oil Discharge Monitoring Equipment

68. The net positive suction head of a boiler centrifugal feed pump should be calculated over and above the.

feedwater vapor pressure

69. Upon disassembling the pump, it is found that the impeller is out of balance. There is no available spare. What will you do if a centrifugal pump vibrates excessively during operation?

Remove metal from the heavy side by machining in a lathe.

7. Air in the fuel lines to the fuel injection nozzles of a diesel engine will cause the engine to

operate with reduced power or stop

70. Demulsibility of a lube oil is defined as

the ability of oil to separate from water

71. Which of the tube types listed can be considered to serve as downcomers at low firing rates, and as generating tubes at high firing rates on some boilers?

Superheater support tubes

72. What is the purpose of the booster unit in a fuel oil system?

To condition the oil for good combustion

73. Air is normally bled from a diesel engine fuel system by_

loosening the compression nuts at the injectors

74. What part of the fuel oil system is used to condition the fuel by removing solid and liquid impurities from the fuel oil?

Purifiers

75. What do you install to connect bilge and baallast line ?

non-return vaalve

76. Engineers use nomogram to get the correct

Size of gravity disc

77. The significant element contained in fuels that determines the specific heat is

hydrocarbon

78. The separation chamber of the purifier is called

Bowl

79. The bilge system has been performing well. However, the aft starboard engine room bilge-well suddenly fails to be pumped out. Which of the following should be done first to determine the cause?

Attempt to pump out another bilge well to determine if the entire system is affected

8. The emergency bilge suction valve is typically used ?

if the bilges becomes flooded and they cannot be emptied by any other means

80. What is required to overcome the head difference when pumping ballast water from double bottom tanks to a higher level through the ship's side overboard valve?

Energy

81. Lubricating oil used in the cylinder liner neutralizes acids produced by the burning of high sulfur fuels to prevent

Corrosion

82. What happens when oil is heated?

The specific gravity increases

83. What part of the fuel oil systemis used to condition the fuel by removing solid and liquid impurities from the fuel oil?

Purifiers

84. A centrifugal pump will vary directly to the discharge head of what part?

Square of the impeller diameter

85. Heating the oil makes the oil,

less viscous

86. Which of the following statements is correct regarding the start-up operation of a noncondensing turbine-driven feed pump?

Open the pump suction valve prior to admitting steam to the turbine.

87. What is this term "maceration" that refers to the process in sewage treatment?

Breaking up of solid matter into fine particle.

88. Ballast pump suction filter was cleaned and the pump was lined up and it was found that there was some leakage in the filter. The pump started and the leakage started. During deballasting it was found that the pump could not take suction from one of the double bottoms tank. The cause could be

pump was drawing air from suction filter

89. Water ballast placed in a tank that has been crude oil washed, but not water rinsed, shall be regarded as

dirty ballast

9. Salinity of distilled water produced from fresh water generator onboard depends on the

amount of feed set in fresh water production

90. A sample of boiler water can be chemically tested by initially adding a few drops of a specific color indicator, then slowly titrating a standard solution into the water sample until the .

sample undergoes a definite color change

91. In an operating lube oil system, the excess of water can be detected by:

the amount of water discharging from the lube oil purifier

92. 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?

273 psig.(1983 kPa).

93. Foot valves are primarily designed to

enable a pump and its suction line to remain primed prior to starting the pump

94. In a multistage reaction turbine, the dummy piston and cylinder function to.

reduce axial thrust

95. The recirculated oil in the fuel oil system is collected in the

Mixing tank

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

introduce a control for maintaining constant steam pressure regardless of boiler load

97. What is the characteristic of lubricating oil which causes additional centrifuging requirements for proper purification?

Low oil demulsibility

98. What corrective action is required if a centrifugal pump gradually develops insufficieent discharge pressure ?

Replace the wear rings.

99. What parts of Oil Discharge monitoring and control system installed at the overboard so that it must close and stop the discharge when permissible limit has been reached?

An overboard valve control system

competence 4.1

ERNO ENRIQUE JOMENTO · 50問 · 1年前

competence 4.1