网友您好, 请在下方输入框内输入要搜索的题目:

题目内容 (请给出正确答案)

Biodegradation of the oil slick in sea water is assisted by all the following marine micro-organisms which are capable of metabolising oil compounds except ______

A.bacteria

B.moulds

C.yeasts

D.seals


参考答案

更多 “ Biodegradation of the oil slick in sea water is assisted by all the following marine micro-organisms which are capable of metabolising oil compounds except ______A.bacteriaB.mouldsC.yeastsD.seals ” 相关考题
考题 In the following statements about the principle of the low level controlling, which is WRONG? 0 A.Low level is monitored on the drain tank and header tank.B.If there is high differential the filters pressure across the circulatingpumps is alarmedC.The lubricating oil purifier cannot take oil from the drain tankD.If the sea water pressure falls, this also operates an alarm

考题 第二组The only attention that heat exchanger should require is to ensure that the heat transfer surfaces remain substantially clean and the flow passages generally clear of obstruction. Indication that undue fouling is occurring is given by a progressive increase in the temperature difference between the two fluids, over a period of time, usually accompanied by a noticeable rise in pressure loss at a given flow.Fouling on the sea-water side is the most usual cause of deterioration in performance. The method of cleaning the sea water-side surfaces depends on the type of heat exchanger. With shell-and-tube heat exchangers, the removal of the header covers or, m the case of the smaller heat exchangers, the headers themselves, will provide access to the tubes. Obstructions, dirt, scale etc., can then be removed, using the tools provided by the heat exchanger manufacturer. Flushing through with fresh water is recommended before a heat exchanger is returned to service. In some applications, such as piston oil cooling, progressive fouling may take place on the outside of the tubes. Most manufactures recommend a chemical flushing pr6cess to remove this in situ~ without dismantling the heat exchanger.Plate heat exchangers may be cleaned by unclamping the stack of plates and mechanically cleaning the surface of each plate as recommended by the manufacturers. The plate seals may require replacement from time to time and here the manufacturers instructions should be closely followedBy which of the following indication, can we conclude that the lube oil-sea water heat exchanger is unduly fouled?A.the heat exchanger lube oil inlet temperature loweringB.the heat exchanger sea-water outlet pressure riseC.the heat exchanger temperature difference between lube oil and sea water increasingD.the heat exchanger pressure difference between sea water inlet and outlet decreasing

考题 What is the most usual reason for the fresh water-sea water heat exchanger fouling in the sea side?A.lube oil sludge accumulating in itB.dirt and scale etc , formed on the surfacesC.deformation of the tubes and the shell or the platesD.lube oil leakage into sea-water side

考题 Cylinders of marine diesel engines are normally cooled by ___ .A.sea waterB.fine mineral oilC.sanitary waterD.fresh water

考题 Which of the following is NOT on the list items to be recorded in Oil Record Book Part I (machinery space operation)?A.accidental discharge of oilB.disposal of oil residuesC.quantity of water produced by F.W.GD.discharge of dirty ballast or cleaning water from fuel oil tanks

考题 Oil slick caused by spillage of oil from tanker ship is ______.A.a drop of oilB.the emulsion of oil at sea surfaceC.the weathered oilD.the oil floating on the surface of the sea water

考题 ______is not a process of weathering of the oil spilled in the sea water.A.BiodegradationB.DissolutionC.Cleaning up by crew with skimmersD.Oxidation including photooxidation

考题 ______is not a process of weathering of the oil spilled in the sea water.A.EmulsificationB.Sedimentation / SinkingC.Oxidation including photooxidationD.Burning organized by RCC

考题 单选题One of the purposes for water cooling the exhaust manifold in marine diesel engine is to ()A reduce lube oil temperatureB raise exhaust temperature reduceC excessive heating of engine roomD reduce load on cooling water pump

考题 单选题Which of the following will be the function of lubricating oil used in marine engines?()A to remove heat from oil cooled pistonsB to wash away wear detritusC to neutralize acidic productsD all of the above

考题 单选题Which of the following is NOT on the list items to be recorded in Oil Record Book Part I (machinery space operation)?()A Accidental discharge of oilB Disposal of oil residuesC Quantity of water produced by FWGD Discharge of dirty ballast or cleaning water from fuel oil tanks

考题 单选题Which of the following operations aboard a tanker must be recorded in the Oil Record Book ()A Any internal transfer of oil cargo during a voyageB The discharge overboard in port or at sea of any bilge water accumulated in machinery spacesC The loading or unloading of any or all oil cargoD All of the above

考题 单选题Each cylinder liner on the marine medium speed engines ().A is usually cooled by sea waterB can be replaced when worn outC is in direct contact with the water in the bore of the cylinderD can t expand when heated

考题 单选题Which of the following is wrong about operation of oily water separator?()A filled with clean water before operationB keep air cushion in oil collecting space during runningC check oil level during runningD clean inner separator with low pressure stream

考题 单选题Which of the following conditions indicates the dilution of diesel engine lube oil by fuel oil?()A Water discharging from the water outlet of the lube oil purifierB Fuel oil discharging from the water outlet of the lube oil purifierC Lube oil discharging from the water outlet of the lube oil purifierD A change in the lube oil viscosity

考题 单选题Oil pressure in the lubrication system is()than the static sea water head to ensure that sea water cannot enter the sterntube in the event of seal failure.A higherB lowerC very higherD very lower

考题 单选题Oil pressure in the lubrication system is () the static sea water head to ensure that sea water () the stem-tube.A lower than;can lubricateB lower than;can coolC higher than;can enterD higher than ;cannot enter

考题 单选题()is not a process of weathering of the oil spilled in the sea water.A BiodegradationB DissolutionC Cleaning up by crew with skimmersD Oxidation including photooxidation

考题 单选题() is used for cylinder and cylinder head, the salt water is used for cooling the lubricating oil, the fresh water in the coolers and the charging air in the air cooler.A The fuel oilB The lube oilC The sea waterD The fresh water

考题 单选题Which of the following actions should normally be taken during each watch when the auxiliary boilers is in operation?()A clean the flame scanner photocell windowB Inspect and clean all solenoid valvesC lift the safety valves by handD Inspect for oil or water leaks

考题 单选题Which of the following statements is correct concerning diesel engine cooling water systems?()A Each engine must have its own engine driven cooling water pump capable of providing cooling for all ranges of operationB propulsion engines with bores exceeding 200 mm are to be fitted with a means to display the cooling water temperature of each cylinderC At least two independent sea suctions are to be provided for supplying water to the engine jackets or to the heat exchangersD Suitable strain are to be fitted between the circulating pumps and heat exchangers when sea water is used for direct cooling

考题 单选题Which of the following statements is true concerning an oil cooler?()A The oil temperature is less than the cooling water temperatureB The oil pressure is less than the cooling water pressureC The oil pressure is greater than the cooling water pressureD The oil flow control valve is always installed in the oil input line

考题 单选题Which of the following operations must be entered on the Oil Record Book Part Ⅰ? () Ⅰ.Routine discharge at sea of bilge water containing oil from the machinery spaces Ⅱ.Bunkering of fuel oilA Ⅰ onlyB Ⅱ onlyC both Ⅰ and ⅡD neither Ⅰ nor Ⅱ

考题 单选题In an oil cooler circulated by sea water, the oil is at a larger pressure the result being that any leak in the cooler will mean a loss of ().A oilB sea waterC refrigerantD fresh water

考题 单选题In a general oil cooler circulated by sea water, the oil is at a higher pressure, the result being that any leak in the cooler will mean a loss of ().A oilB sea waterC airD fresh water

考题 单选题Biodegradation of the oil slick in sea water is assisted by all the following marine micro-organisms which are capable of metabolising oil compounds except().A bacteriaB mouldsC yeastsD seals

考题 单选题()is not a process of weathering of the oil spilled in the sea water.A EvaporationB DispersionC EmulsificationD Drifting