海船船员考试

单选题For an ordinary four-stroke engine the inlet valves open （）A after TDCB before TDCC after BDCD before BDC

题目
单选题
For an ordinary four-stroke engine the inlet valves open （）
A

after TDC

B

before TDC

C

after BDC

D

before BDC

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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
For an ordinary four-stroke engine the exhaust valves open （）.
A

after TDC

B

before TDC

C

after BDC

D

before BDC


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
In a diesel engine, exhaust valves open before the intake ports are uncovered to （） Ⅰ.reduce pumping losses Ⅱ.reduce back pressure
A

Ⅰonly

B

Ⅱonly

C

bothⅠand Ⅱ

D

neitherⅠnor Ⅱ


正确答案： B
解析： 暂无解析

第5题：

单选题
Valve overlap is the period during which （）.
A

the inlet valve is open

B

the exhaust valve is open

C

both valves are closed

D

both valves are open


正确答案： A
解析： 暂无解析

第6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7题：

单选题
The period of valve overlap is when （）.
A

the inlet valve is open

B

the exhaust valve is open

C

both valves are close

D

both valves are open


正确答案： C
解析： 暂无解析

第8题：

Valves on steam-smothering lines to cargo tanks shall be set with ______．

A.The master control valve shut and valves to individual cargo tanks shut

B.The master control valve open and valves to individual cargo tanks shut

C.The master control valve shut and valves to individual cargo tanks open

D.All valves open


正确答案：C

第9题：

单选题
In a four-stroke cycle diesel engine the intake valves open （）
A

before TDC and close after BDC

B

after TDC and close after BDC

C

before TDC and close before BDC

D

after TDC and close before BDC


正确答案： A
解析： 暂无解析

第10题：

单选题
As to the low speed diesel engine, if you want to change the coolant flow for a certain cylinder, you can regulate （）.
A

the inlet valve

B

the outlet valve

C

both the inlet valve and the outlet valve

D

the pump inlet valve


正确答案： C
解析： 暂无解析

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