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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 crankcase
B
water entering the crankcase while engine wash-downs are being performed
C
excessive oil leakage during periods of increased blow-by
D
sub-cooling internal components
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For a continuous operation diesel engine, a duplex filter unit would be the best arrangement becauseA.changing filter elements would not interrupt engine operationB.filtering occurs twice in each pass of oil through the systemC.clogging will not occurD.dropping pressure is half of that through a single filter unit
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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
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Loss of lubricating oil pressure to the main propulsion diesel engine will actuate a/an _____.A.over-speed tripB.audible/visual alarmC.the ships/boats general alarmD.reserve oil storage tank
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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
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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
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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For a continuous operation diesel engine, a duplex filter unit would be the best arrangement because （）.A
changing filter elements would not interrupt engine operationB
filtering occurs twice in each pass of oil through the systemC
clogging will not occurD
dropping pressure is half of that through a single filter unit
考题
单选题When the general alarm is sounded continuously, the engine room personnel should （）.A
proceed to their man overboard stationsB
start the fire pumpC
put on lifejackets and go to their abandon ship stationsD
secure the propulsion diesel engines and evacuate the engine room
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
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单选题Loss of lubricating oil pressure to the main propulsion diesel engine will actuate a/an （）.A
overspeed tripB
audible/visual alarmC
the ships/boats general alarmD
reserve oil storage tank
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The arrangement and shape of the cams on a diesel engine camshaft directly control which of the listed groups of operating conditions?（）A
speed, torque, and horsepower productionB
firing order, valve timing, and valve liftC
fuel consumption, efficiency, and cylinder pressureD
scavenge pressure, compression ratio, and exhaust pressure
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Which of the following statements is true regarding the installation of piston rings on two-stroke/cycle, diesel engines as compared to four-stroke/cycle, diesel engines?（）A
In a two-stroke/cycle engine, the rings run hotter, requiring the end gap to be greaterB
Some provision must be made in a two-stroke/cycle engine to keep the rings from binding in the portsC
No gap is required to exist between the ends of the ring when cold in a two-stroke/cycle engine, but a small gap is required in a four-stoke/cycle engineD
The gaps should be staggered on either side of a piston in a two-stroke/cycle engine, while staggering is not necessary in a four-stroke/cycle engine
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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