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单选题
If a used lube oil analysis indicates an excessive chromate content, this means （）
A
air filtration is inadequate
B
engine coolant leaking into the lube oil
C
fuel oil is leaking into the lube oil
D
the piston rings are excessively worn
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更多 “单选题If a used lube oil analysis indicates an excessive chromate content, this means （）A air filtration is inadequateB engine coolant leaking into the lube oilC fuel oil is leaking into the lube oilD the piston rings are excessively worn” 相关考题
考题
If a used lube oil analysis indicates excessive chromate content, this meansA.air filtration is inadequateB.engine coolant is leaking into the lube oilC.fuel oil is leaking into the lube oilD.the piston rings are excessive worn
考题
In an auxiliary diesel engine bypass type lubricating oil system, the main lube oil pump forces_______ .A.all of the oil used by the engine through a filterB.some of the oil used by the engine through a filterC.some of the oil used by the engine through a centrifugeD.all of the oil used by the engine through a centrifuge
考题
why do you need to take the lube oil sample for analysis ? in the analyzing , what can you possibly find ?and if you find these substances ,what are the possible problems the engines may have ?why ?
考题
What would white exhaust smoke from a diesel engine probably mean ________．A.Late fuel injectionB.Excess combustion airC.Dribbling injector tipsD.Excessive lube oil consumption
考题
单选题Excessive lube oil consumption by a reciprocating air compressor can be caused by （）.A
using a slightly dirty air filterB
using oil having an excessive viscosityC
intercooler or after-cooler leaksD
carrying the oil level higher than normal
考题
单选题A decrease in the flash point of diesel engine lube oil indicates the lube oil has become （）.A
contaminated with sludgeB
contaminated with carbonC
diluted with fuel oilD
diluted with water
考题
单选题Black smoke exhausting from a diesel engine indicates（）A
proper fuel injectionB
water in the fuelC
incomplete combustionD
burning of lube oil
考题
单选题An increase in diesel engine crankcase pressure generally indicates excessive（）A
compression pressureB
lube oil header pressureC
scavenge air pressureD
piston ring blow-by
考题
单选题The pressure difference before and after the lube oil filter indicates （）the filter should be cleaned.A
whenB
howC
whereD
whether
考题
单选题The lube oil cooler is located after the lube oil filter in order for （）A
the filter to operate more efficientlyB
the lube oil cooler to be bypassedC
positive lube oil pump suction to be assuredD
galvanic action in the cooler to be minimized
考题
单选题A lube oil filter can be used to remove most contaminants from lube oilA contaminant which will remain in the lube oil after filtering is （）.A
acidB
fuel oilC
sedimentD
water
考题
单选题Excessive lube oil consumption can result from worn or broken（）A
piston ringsB
valve guidesC
valve sealsD
all of the above
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Excessive lubricating oil consumption in a running diesel engine can be caused by （）A
clogged lube oil pipingB
excessive valve-guide clearanceC
high lube oil viscosityD
low lube oil temperature
考题
单选题Which of the following conditions can cause excessive lube oil consumption in a diesel engine?（）A
Low lube oil temperatureB
Dirty lube oil strainerC
Low lube oil pressureD
High lube oil temperature
考题
单选题The main function of piston compression rings is to （）A
prevent excessive cylinder liner wearB
reduce friction losses in the engineC
seal the space between the piston and the linerD
limit upward flow of lube oil into the combustion space
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Which of the following conditions could be a cause of excessive fuel dilution of diesel engine lube oil?（）A
Leaking fuel injectorsB
Lower than normal compressionC
Delayed fuel injectionD
All of the above are correct
考题
单选题When fuel oil is accidentally missed with lube oil which of the following processes can be used to separate them?（） Ⅰ.filtering Ⅱ.settlingA
Ⅰ onlyB
Ⅱ onlyC
either Ⅰ or ⅡD
neither Ⅰ or Ⅱ
考题
单选题The lube oil pump used in a diesel engine is a （）.A
volute pumpB
centrifugal pumpC
diaphragm pumpD
gear pump
考题
单选题The tailshaft sealing arrangement found a little lube oil leaky and caused a lot of seawater into the bearing, the step should be taken as a makeshift is（）A
dropping lube oil for lubrication, reducing the pollution to the seaB
setting a temporary gravity oil tank and enhanced the position properlyC
lubricating with the used lube oilD
lubricating with the fresh water and navigation in a lower speed
考题
单选题An additive used to improve the ability of a lube oil to reduce friction is known as a/an （）.A
suppressant additiveB
dispersant additiveC
extreme pressure additiveD
viscosity improver additive
考题
单选题If the analysis of used lube oil indicates a high content of iron particles, this could indicate（）A
corrosive deterioration of a bearingB
inadequate air filtrationC
excessive ring and liner wearD
excessive cooling of lubricating oil
考题
单选题If a used lube oil analysis indicates excessive fuel dilution, the lube oil should be （）A
changedB
centrifugedC
filteredD
settled
考题
单选题If the chemical analysis of a lube oil sample taken from a diesel engine indicates an increased neutralization number, the （）.A
acidity has increasedB
viscosity has decreasedC
demulsibility has improvedD
foaming is guaranteed to occur
考题
单选题Excessive piston ring wear in a diesel engine will cause（）A
high lube oil viscosityB
increased lube oil consumptionC
low lube oil temperaturesD
high firing pressures
考题
单选题A four-stroke cycle, turbocharged, 1000 horsepower diesel engine has been operating under loadThe load suddenly increases, causing excessive black exhaust smoke, and a rapid rise in the lube oil temperatureIn response to this condition, you should:（）A
reduce loadB
check your exhaustC
adjust cooling water temperatureD
increase lube oil flow
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