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单选题
The purpose of an oil mist detector in a main propulsion diesel engine is to warn of （）
A
excessive mist density in the crankcases
B
excessively high crankcase vacuum
C
excessively high bearing temperature
D
excessive carbon buildup in the lube oil
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考题
On a medium-speed main propulsion diesel engine, the crank-pin or crank journalbearings receive lubricating oil from( ).A.a spindle lubricatorB.an oil jetC.internal splashingD.drilled passages in the crankshaft
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The main propulsion diesel continues running after you try to shut down. You should now attempt to .A.stop the fuel oil booster pumpB.engage the jacking gearC.secure the lube oil pumpD.shut off the fuel at the settling tank
考题
单选题The rate of cylinder lubricating oil metered to each cylinder of a large low-speed main propulsion diesel engine is （）A
the same, whether at sea, or during maneuveringB
adjusted during each hour of operation while at constant RPMC
higher at sea than while maneuveringD
lower at sea than while maneuvering
考题
单选题The main purpose of starting the diesel engine on air briefly is（）A
to inspect if the cylinder has the water leakageB
to expel out the residual water/gas/oil from the cylinderC
to check if fuel supply is normalD
A and B
考题
单选题The main purpose of an electric space heater installed in a large AC generator is to （）A
prevent the windings from becoming brittleB
prevent moisture from condensing in the windings during shutdownC
prevent acidic pitting of the slip ringsD
keep the lube oil warm for quick starting
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In general, the oil mist defectors include a base plate with air blast pumpThe function of air blast pump is to （）crankcase.A
supply clean air to the measuring compartment of the units for more accuracyB
generaate the pressure required for the extraction of the oil mist from theC
generate the pressure required for the extraction of the oil mist from the crankcaseD
supply clean air to the measuring track of the units for more accuracy
考题
单选题Thermocouple pyrometers are used on large, main propulsion diesel engines to indicate the temperature of the（）A
cooling water leaving each cylinderB
fuel oil entering the injectorC
exhaust gases at various locationsD
lube oil at the bearing supplies
考题
单选题Mist detectors used on large low-speed main propulsion diesel engines monitor and check for the presence of （）.A
fuel oil vapor at the sludge tank ventB
unburned fuel vapors in the scavenge air receiverC
lube oil vapors in the crank caseD
lube oil vapors in the engine room
考题
单选题In general, the oil mist detectors include a built-in heating unit and a compact plug for electrical connectionThe function of heating unit is to （）A
avoid false alarms as a result of condensing water vaporB
avoid danger of frost under very cold weatherC
reduce the viscosity of the crankcase atmosphere in order to improve the fluidityD
keep the temperature of the oil mist detectors in an appropriate range
考题
单选题Oil mist detectors are usually used on board to detect oil mist density within （）.A
the engine crankcaseB
the engine scavenge boxesC
drain tanksD
fuel tanks
考题
单选题In order to start a large, low-speed, main propulsion diesel engine on high viscosity fuel after an extended shutdown, the （）A
fuel must be preheatedB
intake air should be preheatedC
lube oil outlet temperature should be increased 20℃ above normalD
none of the above
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To correct a hunting problem in a main propulsion diesel engine hydraulic governor, you should （）.A
increase the governor oil pressureB
adjust the speed droop settingC
adjust the speeder spring travelD
adjust the compensating needle valve
考题
单选题What color exhaust will be exhibited when a slow speed two-stroke/cycle main propulsion diesel engine, designed to operate on light and heavy fuel oil, is operated on insufficiently preheated heavy fuel oil?（）A
WhiteB
BlackC
BlueD
Clear
考题
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 main purpose of the piston oil scraper rings is to （）.A
seal the space between the piston and the linerB
reduce the amount of lube oil burned in the combustion chamberC
transmit heat from the piston to the cylinder linerD
damp out fluctuations of the piston side thrust
考题
单选题On a medium-speed main propulsion diesel engine, the crank-pin or crank journal bearings receive lubricating oil from （）.A
a spindle lubricatorB
an oil jetC
internal splashingD
drilled passages in the crankshaft
考题
单选题Prior to starting, the purpose of turning over a main propulsion diesel engine with the cylinder test cocks open, is to （）A
test the starting systemB
remove condensation from the cylindersC
check the compressionD
check for proper lube oil pressure
考题
单选题A large, low-speed, crosshead, main propulsion diesel engine using residual fuel oils must have a cylinder oil having a （）A
low TBN valueB
high alkaline reserveC
low flash pointD
high pour point
考题
单选题If it becomes necessary to cutout an individual cylinder of a large, low-speed, main propulsion diesel engine, the fuel to that cylinder should be secured and its （）A
fuel pump should be removed and all connections blanked offB
cylinder oil feed rate should be increased slightly above that used at normal sea speedC
cylinder oil feed rate should be reducedD
cylinder oil feed rate should be increased to the maximum flow capable of the metering pump
考题
单选题Main propulsion engine lube oil sumps should be constructed （）A
so as to never be integral lubeB
with a sloped bottomC
only of nonferrous, noncorrosive metalsD
with drain/return lines terminating just above or at the designed normal level
考题
单选题The construction of the main propulsion engine lube oil sump should （）A
have no plating joints of 90B
retain the lube oil as long as possible before it recirculates through the systemC
provided drain/return lines that are no greater than 24 inches from the pump suctionD
be provided with only a perfectly horizontal bottom
考题
单选题The main propulsion diesel continues running after you try to shut downYoushould now attempt to（）A
stop the combustion air supplyB
engage the jacking gearC
secure the lube oil pumpD
shut off the fuel at the day tank
考题
单选题Most large, low-speed, main propulsion diesel engines use duplex lube oil strainer to （）A
decrease the time required between cleaningsB
removes all large and small foreign objectsC
ensure a positive flow of oil at all timesD
ensure that all lube oil has been treated twice
考题
单选题Cylinder lubrication oil for low speed main propulsion diesel engines is admitted to each cylinder during （）.A
the power strokeB
the compression strokeC
low load operation onlyD
periods of standby
考题
单选题Which of the following conditions may need to be reduced when operating a large, low speed, main propulsion, diesel engine at low loads?（）A
Injection pressuresB
Control air supply pressureC
Cooling water flow through after-coolersD
Lube oil temperature
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