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单选题
With regards to a diesel engine crankcase explosion, the most violent is the（） (1) primary explosion (2) secondary explosion
A
(1) only
B
(2) only
C
both (1) and (2)
D
neither (1) or (2)
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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
考题
A sudden power loss from a turbocharged and after-cooled diesel engine is an indication of a/anA.turbocharger malfunction or failureB.crankcase exhauster overloadC.overload on the intercoolerD.obstruction in the engine cylinders
考题
单选题The marine diesel engine is a type of diesel engine used on ships The （） of its operation is not very difficult to understand.A
principleB
principalC
causeD
case
考题
单选题Water accumulating in the crankcase of a diesel engine could indicate（）A
a cracked cylinder linerB
excessive water in the fuelC
a leaking intercoolerD
excessive moisture in the scavenge air
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If a crankcase explosion has occurred in a diesel engine, and the crankcase remains intact, which of following precautions should be observed?（）A
The cylinder indicator cocks should be openedB
The sump lube oil scavenge pump should be secured immediatelyC
The explosion relief valves should be manually openedD
The crankcase should remain unopened until the engine has cooled
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Regarding a Diesel engine crankcase, the general arrangement and installation should preclude the possibility of （）A
free entry of air to the crankcaseB
water entering the crankcase while engine wash-downs are being performedC
excessive oil leakage during periods of increased blow-byD
sub-cooling internal components
考题
单选题The main purpose of inspection for a running diesel engine is（）A
testing for the mechanical load and the thermal loadB
inspecting thermal and mechanical condition of the engineC
inspecting each system and exhaust temperatureD
testing for compress pressure and explosion pressure
考题
单选题The size of the exhaust valve opening is （）A
most critical in a four-stroke cycle diesel engineB
most critical in a two-stroke/cycle diesel engineC
most critical in a four-stroke/cycle diesel engine if it is turbochargedD
of equal importance in a two-stroke/cycle diesel engine as in a four-stroke/cycle diesel engine
考题
单选题In a diesel engine, blow-by is a result of combustion gases leaking into the crankcase past the （）A
wrist pin bushingsB
compression ringsC
cylinder liner sealsD
cylinder liner sealing ring
考题
单选题Diesel engine ‘blow-by’ into the crankcase is caused by excessive ring（）A
back clearanceB
side clearanceC
gap clearanceD
taper clearance
考题
单选题In a diesel engine, blow-by（）A
increase exhaust back pressureB
causes excessive crankcase pressureC
can only be detected by a compression checkD
decreases fuel consumption
考题
单选题Proper lubrication of the main bearing is more easily obtained in a single acting four-stroke/cycle diesel engine than in a single acting two-stroke/cycle diesel engine because （）A
bearing pressure in a four-stroke/cycle acting single diesel engine is continually reversedB
bearing pressure in a two-stroke/cycle single acting diesel engine is continually reversedC
the maximum bearing pressure is higher in a single acting two-stroke/cycle diesel engineD
two-stoke/cycle diesel engines require more complicated lubrication piping
考题
单选题The crankcase cover should never be allowed to open for investigation when （）A
the engine stopsB
the engine is runningC
you repair the engineD
overhauling the engine
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
考题
单选题If a crankcase explosion occurs in a diesel engine, you should stop the engine and（）A
immediately open all crankcase relief portsB
increase crankcase exhauster speed to draw cool air into the engineC
allow the engine to cool naturallyD
increase crank case scavenge air to remove unburned gases
考题
单选题If a diesel engine has been stopped because of piston seizure due to severe overheating, the crankcase（）A
inspection covers should not be opened until the engine has cooledB
ventilation system should be continued in operation for one hour for coolingC
scavenge pump should be immediately secured to prevent loss of lube oilD
explosion covers should be opened slightly to provide extra ventilation
考题
单选题A diesel engine crankcase ventilation system （）A
prevents spark generationB
removes combustible gasesC
determines the level of combustible gasesD
provides inert gas generation in crankcase
考题
单选题A diesel engines crankcase oil level is found to be too high√ You should suspect that （）.A
the engine was over filledB
there might be a fuel leakC
there might be a water leakD
all of the above
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If you notice smoke coming fro the crankcase exhaust fan outlet of an operating diesel engine, you would suspect（）A
a cracked cylinder linerB
clogged intake portsC
broken piston ringsD
a faulty head gasket
考题
单选题In a normally operating diesel engine, the main cause of lubricating oil contamination in the crankcase is a result of the （）.A
metal particles loosened by wearB
air when no air cleaners are usedC
condensation of water vaporsD
breakdown of the lubricating oil by dilution
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If a crankcase explosion occurs in a diesel engine, which of the listed actions should be taken?（）A
Open the crankcase immediately to check for damageB
Apply fire fighting water through the crankcase breatherC
Allow the engine to cool before opening the crankcaseD
Assume that there is no damage to the crankshaft
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