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Marine four-stroke diesel engines are mainly （）.

题目
单选题
Marine four-stroke diesel engines are mainly （）.
A

of crosshead type

B

of trunk piston type

C

of low speed type

D

all the above

参考答案和解析
正确答案： D
解析： 暂无解析
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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
For an ordinary modem marine four-stroke engine the inlet valves close （）.
A

after TDC

B

before TDC

C

after BDC

D

before BDC


正确答案： A
解析： 暂无解析

第3题：

Proper lubrication of the main bearings is more easily obtained in a single acting, four-stroke/cycle diesel engine than in a tow-stroke/cycle diesel engine because________.

A.The direction of pressure on the journal in four-stroke engine is continuously

B.positive feed lubricators are installed on all bearings of four-stroke engine, whereas as a splash feed system is used on tow-stroke engine

C.four-stroke engines usually utilize a heavier grade of oil than tow-stroke engines

D.Low-stroke engines usually consume less lube oil than four-stroke engines


正确答案：A

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
In large marine diesel engines cylinder oils usually contain additives formulated to impart the （） to clean the rings and grooves.
A

inefficiency

B

oiliness

C

detergency

D

purity


正确答案： A
解析： 暂无解析

第6题：

单选题
Compared to four-stroke/cycle engines, two-stroke/cycle diesel engines have the disadvantage of （）
A

less even torque

B

higher cylinder head temperatures

C

fewer power strokes per revolution

D

greater weight/size requirements


正确答案： A
解析： 暂无解析

第7题：

单选题
Typical marine propulsion plants include（） directly coupled to the vessel’s single large-diameter, fixed-pitch propeller.
A

a single, long-stroke, slow-speed, turbocharged, two-stroke diesel engine

B

a single, long-stroke, medium-speed, turbocharged, four-stroke diesel engine

C

two medium-speed, turbocharged, four-stroke diesel engines

D

a variable-speed AC generator


正确答案： A
解析： 暂无解析

第8题：

Modern marine diesel engines equipped with mechanical fuel injection operate on a combustion phase within the cycle which is ______.

A.entirely constant pressure

B.entirely constant temperature

C.a combination of constant volume and constant pressure

D.a combination of constant temperature and constant pressure


正确答案：C

第9题：

单选题
The reversing cams of some four-stroke/cycle diesel engines are brought into position by （）
A

sliding the camshaft along its axis

B

rotating the cam 180

C

rotating the cam followers 180

D

moving the idler sprockets in the drive chain


正确答案： C
解析： 暂无解析

第10题：

单选题
（）, so they are widely used on board ship nowadays.
A

Diesel engines have more advantages in comparison with gasoline engines

B

Diesel engines have more advantages in comparison to gasoline engines

C

Gasoline engines have more advantages in comparison with diesel engines

D

Gasoline engines have more advantages in comparison to diesel engines


正确答案： D
解析： 暂无解析

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