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In a four-stroke engine the camshaft rotates at （）.

题目
单选题
In a four-stroke engine the camshaft rotates at （）.
A

half the engine speed

B

twice the engine speed

C

the engine speed

D

four times the engine speed

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相似问题和答案

第1题：

单选题
For an ordinary four-stroke diesel engine the exhaust 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2题：

单选题
In the four-stroke engine, it takes （） to make one power stroke.
A

one propulsion

B

two propulsions

C

two revolutions

D

one revolution


正确答案： B
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
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
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7题：

单选题
For diesel engine piston cooling, lubricating oil can be supplied to the pistons by a/an （）.
A

oil spray

B

oil bath

C

oil control rings

D

drilled passage through the camshaft


正确答案： B
解析： 暂无解析

第8题：

_______is usually driven by the engine camshaft and supplies pilot air to the cylinder air start valve.

A.An air receiver

B.An operating valve

C.An automatic valve

D.An air distributor


正确答案：D

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
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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