单选题One of the reasons that cause oil flowed from sludge outlet of a self-cleaning separator is（）Aseal water supply be cut offBmake up water supply be cut offCoil outlet valve closed or not open sufficientlyDthe flow rate of oily water is too much
单选题
One of the reasons that cause oil flowed from sludge outlet of a self-cleaning separator is（）
A
seal water supply be cut off
B
make up water supply be cut off
C
oil outlet valve closed or not open sufficiently
D
the flow rate of oily water is too much
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One of the reasons that causes oil flowed from sludge outlet of a self-cleaning purifier isA.seal water supply be cut offB.make-up water supply be cut offC.oil outlet valve closed or not open sufficientlyD.the flow rate of oil is too much
第二组Displacement pumps are those where the volume of the pump chamber is alternately increased to draw the liquid in from the suction pipe and then decreased to force the liquid out into the delivery pipe. Centrifugal pumps are those wherein an impeller rotating at high speed throws the liquid by centrifugal force from the center to the periphery of the impeller where the liquid is discharged through the delivery outlet.Gear pump consists of two or more meshing gears (spur, single or double helical teeth) enclosed m a close-fitted housing. These are used extensively for pumping fuel oil, lubricating oil and hydraulic oil. When gears are unmeshed on the inlet side, a pressure drop occurs that helps the atmospheric pressure acting on the surface of the oil in the reservoir to force it up the pipe to fill the void, the oil is then transferred around the periphery of the pump housing. As the gear teeth mesh again on the outlet side, they form. a seal that prevents oil from backing up to the inlet, the oil in the void is then be forced out into the discharge line.All vane pumps have a rotor driven within a ring (cam ring) by a drive shaft coupled to a prime mover. A cylindrical rotor with sliding vanes, generally in radial slots, rotates within the ring. The center of the rotor is offset from the center of the ring. In a simple vane pump, as the rotor turns, the vanes are forced outward against the inner surface of the cam ring by centrifugal force. This outward radial movement of the vanes and turning of the rotor causes the chamber between the vanes to increase as the vanes pass further away from the inlet port. This increase in volume results in a lowering of pressure until the atmospheric pressure is sufficient to force oil from the reservoir into the inlet chamber. Oil from the inlet is swept away by the vanes toward the outlet port through a decreasing series of chambers until it is forced through the outlet port. A vane pump of balanced design has an elliptical cam ring so that two pumping chambers are formed. This pump is in hydraulically balance, since the two intake and two outlet ports are diametrically opposed to each other. Therefore the side loads exerted on the rotor cancel out, thereby increasing bearing lift and permitting high operating pressure.According to the last sentence of paragraph 1, from where the liquid is discharged through the delivery outlet?A.from the eye of the impellerB.from passage of impellerC.from the periphery of the impellerD.from the impeller
_______can cause oil flow from water outlet of the oil purifier.A.Oil inlet valve opening too quicklyB.Oil temperature little higher than normalC.Diameter of gravity disc too smallD.Viscosity of oil little lower than normal
The core item in the Oil Record Book Part I is ____, and its main content is____.A.Item A, BALLAST OR CLEANING OF FUEL OIL TANKSB.Item B, DISCHARGE OF DIRTY BALLAST OR CLEANING WATER FROM FUEL OIL TANKS REFERRED TO UNDER SECTION(A)C.Item C, DISPOSAL OF OIL RESIDUES(SLUDGE)D.Item H, BUNKERING OF FUEL OIL
Sludge may be formed in the oil in the crankcase of a reciprocating air conditioning compressor as a result of ______.A.refrigerant bubbles in the lube oilB.refrigerant reducing the lube oil viscosityC.oxidation(氧化) of the lube oil from overheatingD.reducing the floc or cloud point of the oil
The core(核心) item in the Oil Record Book Part I is______, and its main content is______.A.Item A, BALLAST OR CLEANING OF FUEL OIL TANKSB.Item B, DISCHARGE OF DIRTY BALLAST OR CLEANING WATER FROM FUEL OIL TANKS REFERRED TO UNDER SECTION(A)C.Item C, DISPOSAL OF OIL RESIDUES(SLUDGE)D.Item H, BUNKERING OF FUEL OIL
单选题When the ship is going to enter into the harbor,（）Achange from heavy fuel oil to diesel oil for mail engineBpumping oil bilge waterCchange sea chest form high level one to lower oneDtest emergency generator
单选题（）can be used to prevent hydraulic system overloaded or keep the pressure of oil outlet from pump constant.AOverflow valveBReducing valveCBalancing valveDReducing valve or balancing valve
单选题（）can cause oil flow from water outlet of a separator.AOil inlet valve opening too quicklyBOil temperature too highCDiameter of gravity disc too smallDViscosity of oil too low
单选题Before operating a non-oceangoing ship greater than 100 gross tons it must have a fixed piping system to discharge oily mixtures ashore. This system must include（）.Aapproved oil-water separating equipmentBa fixed or portable containment system at the shore connectionCa spare pump in case the main pump is inoperativeDat least one outlet accessible from the weather deck
单选题Which of the following conditions indicates the dilution of diesel engine lube oil by fuel oil?（）AWater discharging from the water outlet of the lube oil purifierBFuel oil discharging from the water outlet of the lube oil purifierCLube oil discharging from the water outlet of the lube oil purifierDA change in the lube oil viscosity
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单选题The sludge tank installed in the diesel engine room is used to collect（） Ⅰ.sludge from the fuel oil settling tanks ad centrifuge Ⅱ.water that has been collected in the settling tankAⅠonlyBⅡ onlyCbothⅠand ⅡDneitherⅠor Ⅱ
单选题In a disk-type lubricating oil purifier, （）Athe purifier driving gears are lubricated by the reclaimedBoil as it leaves the bowl all dirt and sludge are automatically discharged with the cooling waterCsealing water must never be supplied until after oil is fed to the unitDdeterioration of the bowl ring gasket will cause the purifier to lose its water seal
单选题What is one effect of running a diesel engine at too cool a temperature? （）ABuildup of sludge in the lubricating systemBExcessive fuel consumptionCSevere heat stresses on mechanical partsDFoaming of the lubricating oil
单选题Which one of the following is not generally recognized as one constitute of bilge water?（）AOil leaking from tanks inside engine roomBEngine room cleaning waterCWater leaking from the separator sludge tankDSewage
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单选题（）can not cause oil flow from water outlet of self-cleaning separator.AOil temperature too highBDiameter of gravity disc too largeCOil temperature too lowDHigh level tank out of water
单选题Broken intake valve springs on one cylinder of a diesel engine can cause the engine to （）AOver speedBfire improperlyClose oil pressureDoverheatrapidly
单选题If fuel oil were being discharged from the waster outlet of a fuel oil disk type centrifuge, operated as separator, you should（）Aremove the discharge ringBre-prime the purifierCthe centrifuge to its proper speedDinstall an additional discharge ring
单选题One of the reasons that cause oil flowed from sludge outlet of a self-cleaning separator is（）Aseal water supply be cut offBmake up water supply be cut offCoil outlet valve closed or not open sufficientlyDthe flow rate of oily water is too much
单选题One of the reasons that causes oil flowed from sludge outlet of a self-cleaning purifier is （）Aseal water supply be cut offBmake-up water supply be cut offCoil outlet valve closed or not open sufficientlyDthe flow rate of oil is too much
单选题Sludge formation in a diesel engine lube oil system is caused by（）Acarbonization of oils from the combustion chambersBemulsions of lube oil and waterCcoagulation of unburned fuel below the piston ringsDall of the above
单选题Concerning the incinerator’s operation, which of the following is not correct?（）AScavenging time should be more 30 seconds before ignitingBThe temperature of sludge tank is 80~100℃CFirst igniting the incinerator with diesel oil, when the temperature of health is about 600℃, the sludge oil drawn inDThe ash can be dumped into sea when the distance is more than 3 miles from land
单选题Sludge may be formed in the oil in the crankcase of a reciprocating air conditioning compressor as a result of （）Arefrigerant bubbles in the lube oilBrefrigerant reducing the lube oil viscosityCoxidation of the lube oil from overheatingDreducing the floc or cloud point of the oil
单选题Which harmful consequence may be the result of lube oil sludge accumulation? （）AClogged oil pump suction screensBIncreased oil operating temperaturesCSticking piston ringsDAll of the above
单选题Just after stopping the engine while the oil is still circulating.Check that uniform oil jets appear from all the oil outlet grooves in the crosshead bearing lower shell and the guide shoes.The oil flow from （） must be compared from unit; there should be a similarity in the flow patterns.Athe piston cooling oil return pipesBthe main and crankpin bearingsCthrust and intermediate bearingsDstern tube and thrust bearings
单选题Which of the listed failures, occurring in an automated diesel generator system, should cause an audible alarm at the engine room control station?（）ALow cooling water outlet temperatureBHigh lube oil pressureCLow lube oil temperatureDLow starting air pressure