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单选题
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 oil
B
refrigerant reducing the lube oil viscosity
C
oxidation of the lube oil from overheating
D
reducing the floc or cloud point of the oil
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更多 “单选题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 of the lube oil from overheatingD reducing the floc or cloud point of the oil” 相关考题
考题
Crankcase explosions in propulsion diesel engines result from ____.A.the splashing of lubrication oil by the crankshaftB.the dilution of crankcase oil with particles of combustionC.broken fuel lines spraying oil on the crankcaseD.the ignition of unburned fuel and air in the crankcase
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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
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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
考题
Sludge may form in the crankcase of an air conditioning compressor as a result of ______.A.bubbling refrigerantB.overheating and oxidationC.lowered operating temperaturesD.reducing the cloud or floc point
考题
The ______is used to burn oil sludge.A.clarifierB.oily water separatorC.incineratorD.distiller
考题
单选题（） that everything in the engine crankcase is correct, start up the crankcase lubricating oil pump.A
To satisfyB
To be satisfiedC
After satisfyingD
After being satisfied
考题
单选题A refrigeration system compressor crankcase is sweating or unusually coldThis is an indication of（）.A
a shortage of refrigerant in the systemB
air in the systemC
an accumulation of liquid refrigerant in the crankcaseD
a shortage of oil in the crankcase
考题
单选题Telescopic pipes to the piston of a large slow-speed main propulsion diesel engine are designed to prevent （）.A
excessive crankcase pressureB
excessive lube oil temperatureC
contamination of the lube oil by waterD
contamination of the cooling water by lube oil
考题
单选题Excessive oil foaming in the crankcase of a refrigeration compressor can result in （）.A
overheated compressor bearingsB
excess lube oil viscosityC
carbon deposits on the compressor piston ringsD
wax crystals forming in the lubricant
考题
单选题Sludge may form in the crankcase of an air conditioning compressor as a result of （）.A
bubbling refrigerantB
overheating and oxidationC
lowered operating temperaturesD
reducing the cloud or flash point
考题
单选题Which of the following conditions is most likely to occur when unburned fuel contaminates the crankcase of a diesel engine?（）A
Lube oil is diluted and its viscosity is reducedB
Sulfuric acid is formedC
Bearings become pitted ad immediately failD
Valve stems develop sludge deposits
考题
单选题In a refrigeration system, foaming of the crankcase oil may cause the （）.A
expansion valve to overfeedB
compressor to knockC
water regulating valve to failD
crankcase drains to plug
考题
单选题What function is provided by the crankcase ventilation system on some diesel engines?（）A
Increases the sludge forming tendency of lube oilB
Prevents the accumulation of combustible gasesC
Improves lube oil coolingD
Improves cold weather starting
考题
单选题The most common cause of lowering the crankcase lube oil flash point is （）.A
more water contentsB
contamination with fuel oilC
higher temperatureD
sufficient cooling of oil mist
考题
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 tankA
ⅠonlyB
Ⅱ onlyC
bothⅠand ⅡD
neitherⅠor Ⅱ
考题
单选题（）can cause oil flow from sludge outlet of self cleaning separator.A
Too much sludge accumulated in separator bowlB
Diameter of gravity disc too largeC
High level tank lack of waterD
Oil input too rapidly
考题
单选题Crankcase explosions in propulsion diesel result from（）A
the splashing of lubrication oil by the crankshaftB
the dilution of crankcase oil with particles of combustionC
broken fuel lines spraying oil on the crankcaseD
the ignition of unburned fuel and air in the crankcase
考题
单选题Sludge may form in the lubricating oil crankcase of a reciprocating air conditioning compressor as a result of （）.A
wax precipitation in the lube oilB
contamination by dust, scale, or moistureC
refrigerant bubbles in the lube oilD
refrigerant reducing the lube oil viscosity
考题
单选题How dose water enter the crankcase of a diesel engine?（）A
Through the crankcase exhausterB
As water vapor contained in blow-byC
Demulsifying lube oil passing through the main bearingsD
Condensation from vapor formed in the expansion tank
考题
单选题The （）is used to burn oil sludge.A
clarifierB
oil/water separatorC
incineratorD
distiller
考题
单选题When fuel enters the crankcase of a diesel engine, it （）A
dilutes the lube oil and reduces its viscosityB
forms sulfuric acid in the lube oilC
causes pitting and failure of the bearingsD
causes sludge deposits on valve stems
考题
单选题Sludge formation in a diesel engine lube oil system is caused by（）A
carbonization of oils from the combustion chambersB
emulsions of lube oil and waterC
coagulation of unburned fuel below the piston ringsD
all of the above
考题
单选题The oil sludge is burnt in the （）on board I’ll show you the ashes.A
boilerB
main engineC
auxiliary engineD
incinerator
考题
单选题Concerning the incinerator’s operation, which of the following is not correct?（）A
Scavenging time should be more 30 seconds before ignitingB
The temperature of sludge tank is 80~100℃C
First igniting the incinerator with diesel oil, when the temperature of health is about 600℃, the sludge oil drawn inD
The ash can be dumped into sea when the distance is more than 3 miles from land
考题
单选题Which harmful consequence may be the result of lube oil sludge accumulation? （）A
Clogged oil pump suction screensB
Increased oil operating temperaturesC
Sticking piston ringsD
All of the above
考题
单选题Before the sludge in a purifier is ejected,（）A
the oil feeding is stopped and replaced by admitting flushing waterB
the flushing water feeding is stopped and replaced by admitting oilC
the feeding of dirty oil and flushing water is stoppedD
the feeding of dirty oil and flushing water is admitted
考题
单选题These acid residues must be prevented from entering the crankcase, otherwise the lube oil would be（）A
contaminatedB
emulsifiedC
deterioratedD
oxidated
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