海船船员考试

单选题In a diesel engine,（） works as working medium and changes the heat energy to mechanical energy, changes the reciprocating movement to rotary moment（）A fuel spray； the burning of the fuelB the burned gas mixture； connecting rodC medium shaft；crankshaftD

题目
单选题
In a diesel engine,（） works as working medium and changes the heat energy to mechanical energy, changes the reciprocating movement to rotary moment（）
A

fuel spray； the burning of the fuel

B

the burned gas mixture； connecting rod

C

medium shaft；crankshaft

D

the burned gas mixture； piston rod

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相似问题和答案

第1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

principle

B

principal

C

cause

D

case


正确答案： D
解析： 暂无解析

第2题：

单选题
In a diesel engine, offers the heat energy directly（）； works as working medium and changes the heat energy to mechanical energy（）
A

the burning of the fuel； medium shaft

B

fuel spray； fresh air

C

fuel； fuel spray

D

the burning of the fuel； the burned gas mixture


正确答案： C
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
The size of the exhaust valve opening is （）
A

most critical in a four-stroke cycle diesel engine

B

most critical in a two-stroke/cycle diesel engine

C

most critical in a four-stroke/cycle diesel engine if it is turbocharged

D

of equal importance in a two-stroke/cycle diesel engine as in a four-stroke/cycle diesel engine


正确答案： A
解析： 暂无解析

第5题：

单选题
（） can be found on most medium to large merchant vessels even if the main engine is either a steam turbine or 2-stroke crosshead engine.
A

The medium speed 4-stroke trunk piston engine

B

The low speed 2-stroke crosshead engine

C

The medium speed 2-stroke crosshead engine

D

The low speed 4-stroke trunk piston engine


正确答案： A
解析： 暂无解析

第6题：

单选题
Before shutting off the fuel supply to stop a medium or high–speed diesel engine, why is it necessary to allow the engine to idle for a few minutes?（）
A

To prevent internal damage form local overheating

B

To ensure the fuel nozzles are flushed clean

C

To clear the smoke stack

D

To let the waste heat boiler reduce its rate of steam generation


正确答案： D
解析： 暂无解析

第7题：

单选题
A supercharged diesel engine when compared to a similar naturally aspirated diesel engine, will develop an increase in （）
A

ignition lag

B

engine horsepower

C

lube oil system pressure

D

specific fuel consumption


正确答案： D
解析： 暂无解析

第8题：

One cylinder of a diesel engine is persistently knocking and does not cease(停止) when the fuel supply to that cylinder is secured.Which of the following problems may be the cause?

A.Low loading of the cylinder

B.Excessive cooling of that piston

C.Sluggish ring action on the piston

D.A mechanical defect in a working part


正确答案：D

第9题：

单选题
Starting a large low-speed propulsion diesel engine on diesel fuel during cold weather conditions, will be made easier by （）
A

increasing the quantity of starting air

B

increasing the lube oil pressure

C

heating the engine fuel supply

D

heating the engine coolant


正确答案： A
解析： 暂无解析

第10题：

单选题
Why a gearbox is needed in a ship driven by a medium-speed diesel engine?（）
A

To reduce the main engine speed

B

To increase the main engine speed

C

To govern the main engine speed

D

To fix the propeller shaft


正确答案： A
解析： 暂无解析

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