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单选题What is the speed of the crankshaft in a four-stroke/cycle engine when the camshaft is turning at 750 rpm?（）A 375 RPMB 500 RPMC 750 RPMD 1500 RPM

题目
单选题
What is the speed of the crankshaft in a four-stroke/cycle engine when the camshaft is turning at 750 rpm?（）
A

375 RPM

B

500 RPM

C

750 RPM

D

1500 RPM

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相似问题和答案

第1题：

单选题
What is the speed of the crankshaft in a four-stroke/cycle engine when the camshaft is turning at 750 rpm?（）
A

375 RPM

B

500 RPM

C

750 RPM

D

1500 RPM


正确答案： C
解析： 暂无解析

第2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3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
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
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7题：

单选题
A diesel engine which is rated for normal operation at a crankshaft speed of 800 RPM, is commonly classed as a （）.
A

slow-speed diesel

B

medium-speed diesel

C

high-speed diesel

D

constant-speed diesel


正确答案： C
解析： 暂无解析

第8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9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10题：

单选题
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： B
解析： 暂无解析

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