海船船员考试

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 crankcasesB excessively high crankcase vacuumC excessively high bearing temperatureD excessive carbon buildup in the lube oil

题目
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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相似问题和答案

第1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 maneuvering

B

adjusted during each hour of operation while at constant RPM

C

higher at sea than while maneuvering

D

lower at sea than while maneuvering


正确答案： C
解析： 暂无解析

第2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 brittle

B

prevent moisture from condensing in the windings during shutdown

C

prevent acidic pitting of the slip rings

D

keep the lube oil warm for quick starting


正确答案： A
解析： 暂无解析

第3题：

On a medium-speed main propulsion diesel engine, the crank-pin or crank journalbearings receive lubricating oil from( ).

A.a spindle lubricator

B.an oil jet

C.internal splashing

D.drilled passages in the crankshaft


正确答案：D
解析：medium：中等，介质;pin：销，刺穿，钉住;journal：轴颈;spindle：芯轴，转轴;lubricator：注油器;splash：飞溅
译文：对于中速主推进柴油机，曲柄销轴承通过曲轴内钻孔的油道供油润滑。

第4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 vent

B

unburned fuel vapors in the scavenge air receiver

C

lube oil vapors in the crank case

D

lube oil vapors in the engine room


正确答案： C
解析： 暂无解析

第5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 accuracy

B

generaate the pressure required for the extraction of the oil mist from the

C

generate the pressure required for the extraction of the oil mist from the crankcase

D

supply clean air to the measuring track of the units for more accuracy


正确答案： D
解析： 暂无解析

第6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 leakage

B

to expel out the residual water/gas/oil from the cylinder

C

to check if fuel supply is normal

D

A and B


正确答案： D
解析： 暂无解析

第7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 pressure

B

excessive lube oil temperature

C

contamination of the lube oil by water

D

contamination of the cooling water by lube oil


正确答案： C
解析： 暂无解析

第8题：

The main propulsion diesel continues running after you try to shut down. You should now attempt to .

A.stop the fuel oil booster pump

B.engage the jacking gear

C.secure the lube oil pump

D.shut off the fuel at the settling tank


正确答案：A

第9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 cylinder

B

fuel oil entering the injector

C

exhaust gases at various locations

D

lube oil at the bearing supplies


正确答案： A
解析： 暂无解析

第10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 vapor

B

avoid danger of frost under very cold weather

C

reduce the viscosity of the crankcase atmosphere in order to improve the fluidity

D

keep the temperature of the oil mist detectors in an appropriate range


正确答案： A
解析： 暂无解析

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