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单选题
Improper cooling of a diesel engine cylinder liner due to the accumulation of scale deposits may cause （）.
A
low compression pressure
B
increased piston wear
C
increased cylinder lube oil consumption
D
poor contact between compression rings and liner
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Diesel engine blow-by is the leakage of combustion gases past the( ).A.oil rings onlyB.compression and scraper ringsC.cylinder liner sealingD.cylinder liner ring grooves
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A crack in a cylinder liner can be caused byA.worn piston ringsB.installation of undersized sealing ringsC.operating the engine at low loadsD.restricted cooling water passages
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Low compression in a diesel engine could be caused byA.worn or broken cylinder liner sealing ringsB.high cooling water temperatureC.worn or broken piston ringsD.low fuel oil pressure
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单选题Low compression in a diesel engine can be caused by （）A
clogged coolant passagesB
a leaking cylinder head gasketC
low fuel oil pressureD
worn or broken cylinder liner sealing rings
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单选题During the running of the diesel engine, if the supply of cooling water is interrupted or the temperature of cooling water out of the cylinder is too high, the duty engineer should （）A
notify the duty officer, reduce the engine speed, take some measures to remove failuresB
notify the duty officer and stop the engine immediately, find the cause and remove failuresC
notify the C/ED
notify the captain
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单选题The consistent burning of fuel oil with a high sulfur content in a diesel engine will result in （）A
clogged fuel injection pumpsB
increased cylinder liner wearC
intake valve stem corrosionD
varnish deposit on pistons
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单选题A diesel engine cylinder head can crack as a result of （）A
a leaking seal ringB
heat transfer from exhaust valvesC
restricted cooling passagesD
overheated intake valves
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单选题Scuffed cylinder liner wearing surfaces in a diesel engines can result from （）A
starting the engine while hotB
knurling the piston skirtC
operating the engine overheatedD
scuff resistant piston rings
考题
单选题If the relief valve on a diesel engine cylinder lifts, the cause could be due to （）A
liquid in the cylinderB
low compression in the cylinderC
high exhaust temperatureD
poor fuel penetration
考题
单选题Which of the following conditions could contribute to the cracking of a diesel engine cylinder head?（）A
Leaking seal ringB
Insufficient heat transfer from the exhaust valvesC
Block cooling water passages to the headD
Excessive scavenging air provided to the engine
考题
单选题Scuffed cylinder liner wearing surfaces in a diesel engines can result from （）A
chromium plating piston ringsB
knurling the piston skirtC
extended maximum power operationD
applying load to a cold diesel engine
考题
单选题In a diesel engine, an integral liner is one in which the cooling water （） Ⅰ.flows through the cylinder liner jackets Ⅱ.touches the outer side of the linerA
Ⅰ onlyB
Ⅱ onlyC
both Ⅰ and ⅡD
neither Ⅰ and Ⅱ
考题
单选题In a diesel engine, a cylinder liner should be replaced if it is （） Ⅰ.Scuffed Ⅱ.ScoredA
Ⅰ only is correctB
Ⅱ only is correctC
both Ⅰ and Ⅱ are correctD
neither Ⅰ or Ⅱ are correct
考题
单选题Low compression pressure in a diesel engine is caused by（）A
low water in the expansion tankB
improperly seated valvesC
low fuel oil pressureD
worn or broken cylinder liner sealing rings
考题
单选题Low compression in a diesel engine could be caused by（）A
worn or broken cylinder liner sealing ringsB
high cooling water temperatureC
worn or broken piston ringsD
low fuel oil pressure
考题
单选题Cylinder liner cooling is often referred to as （）.A
piston coolingB
sleeve coolingC
central coolingD
jacket cooling
考题
单选题As for a diesel engine, lack of combustion air may be due to （）.A
fouling turbineB
fuel pump faultsC
lubrication failureD
excessive cooling
考题
单选题If water is found in the crankcase of a diesel engine, the cause may be due to（）A
a cracked cylinder headB
a leaky cylinder head gasketC
a cracked cylinder linerD
any of the above
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单选题Persistent knocking of one cylinder of a diesel engine ceases when the fuel supply to that cylinder is securedThis problem may be a result of （）A
low loading of that cylinderB
faulty combustion in that cylinderC
sluggish piston ring actionD
excessive piston cooling
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单选题A bright shiny appearance of the sealing surfaces on diesel engine compression rings indicates（）A
combustion gas blow-byB
excessive lubricationC
properly functioning ringsD
insufficient cylinder cooling
考题
单选题Engine coolant accumulating in the diesel engine lubricating oil can result from a （）A
low oil pressureB
high coolant pressureC
leaking fuel injectorD
cracked cylinder head or liner
考题
单选题Piston compression rings used in a diesel engine function to （）A
transfer heat from the cylinder to the pistonB
scrape oil from the sides of the pistonC
seal the combustion space from the crankcasesD
prevent any piston contact with the cylinder liner
考题
单选题In a diesel engine, excessive cylinder liner wear will cause （） Ⅰ.increased blow-by Ⅱ.wear between the piston ring and grooveA
Ⅰonly is correctB
Ⅱ only is correctC
both Ⅰ and Ⅱ are correctD
neither Ⅰ or Ⅱ are correct
考题
单选题Diesel engine piston seizure can be caused by （）A
poor cooling of cylinder wallsB
improper cooling of the pistonC
insufficient piston lubricationD
all of the above
考题
单选题Fresh water is used for the cooling of cylinder jackets and （） of the marine diesel engine.A
cylinder coversB
lubricating spaceC
crossheadD
exhaust manifold
考题
单选题Before engaging the turning gear and turning the diesel engine, which of the following operation should be done except（）A
open the indicator cocksB
supply some CYL Oil to cylinder liner wall with lubricator (only for two stoke diesel engine)C
put the fuel handle in the “stop” positionD
pump up the air bottle
考题
单选题A properly honed diesel engine cylinder liner will（）A
prevent piston ring wearB
shorten the ring break-in periodC
prevent cylinder liner glazingD
appear slick and glazed
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