海船船员考试

单选题Scavenging is （） of exhaust gases by blowing in fresh air.A the suctionB the compressionC the removalD the deliver

题目
单选题
Scavenging is （） of exhaust gases by blowing in fresh air.
A

the suction

B

the compression

C

the removal

D

the deliver

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相似问题和答案

第1题：

Exhaust gases are generally removed from the cylinders of a two-stroke/cycle diesel engine by

A.natural aspiration

B.masked intake valves

C.air ceils

D.scavenging air


正确答案：D

第2题：

The smog is due（ ）invisible gases，mostly from automobile exhaust.

A.from
B.to
C.for
D.with

答案：B
解析：
题目意为“烟雾是由隐形气体引起的，主要来自汽车尾气。”due to为固定搭配，意为“由于”，后面接名词短语，故选项B正确。
　　

第3题：

In a()boiler the hot gases from the furnace pass gases from the furnace pass water is on the outside.

A.water-tube

B.fire-tube

C.exhaust gas

D.composite


答案：B

第4题：

单选题
（） are fitted in the exhaust system and facilitate charge removal and scavenging in each cylinder.
A

Diffusers

B

Compressors

C

Steam boilers

D

Soot blowers


正确答案： C
解析： 暂无解析

第5题：

单选题
Air scavenging of a diesel engine cylinder（）
A

blows out the exhaust gases

B

supplies oxygen for combustion

C

cools the valves and cylinder walls

D

all of the above


正确答案： C
解析： 暂无解析

第6题：

A two stroke diesel engine exhaust temperature will be lower than a four stroke diesel engine of the same displacement because the _____. ① MEP is lower and the scavenging air is cooling the exhaust gases ② valve overlap in a four stroke

A.①

B.②

C.① and ②

D.Neither ① nor ② is correct


正确答案：A

第7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8题：

Any increase in the exhaust back pressure of a four-stroke/cycle diesel enginewill( ).

A.reduce engine horsepower output

B.aid in silencing the exhaust noise

C.increase the mean effective pressure

D.contribute to effective cylinder scavenging


正确答案：A
解析：aid：援助;contribute to：对…起作用
译文：四冲程柴油机排气背压升高将会减少发动机的功率输出。

第9题：

单选题
（） is the removal of exhaust gases by blowing in fresh air.
A

Gas exchange

B

Charging

C

Scavenging

D

Supercharging


正确答案： D
解析： 暂无解析

第10题：

单选题
A two-stroke diesel engine exhaust temperature will be lower than a four-stroke diesel engine of the same displacement because the （） (1) MEP is lower and the scavenging air is cooling the exhaust gases (2) valve overlap in a four-stroke
A

(1) only is correct

B

(2) only is correct

C

both (1) and (2) are correct

D

Neither (1) or (2) are correct


正确答案： C
解析： 暂无解析

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