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During the power stroke of a four-stroke/cycle diesel engine

题目
单选题
During the power stroke of a four-stroke/cycle diesel engine, most of the side thrust of a trunk-type piston is absorbed by the（）
A

piston skirt

B

pinion

C

crosshead

D

compression rings

参考答案和解析
正确答案： B
解析： 暂无解析
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相似问题和答案

第1题：

单选题
In a single acting, four-stroke/cycle diesel engine, the power impulse in an individual cylinder occurs （）
A

once every crankshaft revolution

B

once every two crankshaft revolutions

C

once every piston stroke

D

twice every piston stroke


正确答案： D
解析： 暂无解析

第2题：

单选题
In a four-stroke/cycle diesel engine, after the completion of the power stroke, the piston will move（）
A

up and draw in a fresh air charge

B

down to burn off fuel

C

down to compress the fuel air charge

D

up and force out the exhaust gases


正确答案： D
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
When an air started, four-stroke/cycle diesel engine is being cranked, the starting air is admitted to each cylinder during what would normally be the（）
A

intake stroke

B

compression stroke

C

power stroke

D

exhaust stroke


正确答案： A
解析： 暂无解析

第5题：

单选题
The camshaft drive is designed to maintain proper camshaft speed relative to crankshaft speedIn maintaining this relationship, the camshaft drive causes the camshaft to rotate at（）
A

one half crankshaft speed in a two-stroke cycle diesel engine

B

crankshaft speed in a two-stroke cycle diesel engine

C

two times crankshaft speed in a two-stroke cycle diesel engine

D

one-fourth times crankshaft speed in a four-stroke cycle diesel engine


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
A connecting rod in a four-stroke/cycle diesel engine is subject to（）
A

tension load twice each crankshaft revolution

B

compression load during power and compression strokes

C

inertia load once every four crankshaft revolutions

D

bending loads at bottom and top dead center


正确答案： C
解析： 暂无解析

第8题：

If all other conditions such as bore, stroke, speed, and mean effective pressures are equal, a two stroke/cycle diesel engine will develop approximately

A.the same indicated horsepower as a four-stroke/cycle engine

B.twice the indicated horsepower as a four-stroke/cycle engine

C.one half the indicated horsepower as a four-stroke/cycle engine

D.one power stroke for every two crankshaft revolutions


正确答案：B

第9题：

单选题
Air motion is induced in a four-stroke/cycle diesel engine cylinder to improve air fuel mixing, and is known as（）
A

supercharging

B

scavenging

C

turbulence

D

swept volume charging


正确答案： C
解析： 暂无解析

第10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

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