海船船员考试

单选题Clogged or partially obstructed exhaust ports on a diesel engine can cause（）A over-speeding of the engineB failure of the engine to shut downC no effect of engine mounting boltsD high exhaust temperatures

题目
单选题
Clogged or partially obstructed exhaust ports on a diesel engine can cause（）
A

over-speeding of the engine

B

failure of the engine to shut down

C

no effect of engine mounting bolts

D

high exhaust temperatures

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相似问题和答案

第1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2题：

单选题
A water jacket is placed around the exhaust manifolds of propulsion diesel engines to（）
A

reduce heat radiation to the engine room

B

aid in preventing turbocharger overheating

C

condense and drain moisture from exhaust gases

D

dampen exhaust gas pulsations in the manifold


正确答案： A
解析： 暂无解析

第3题：

A water jacket is placed around the exhaust manifolds of propulsion diesel enginesto( ).

A.reduce heat radiation to the engine room

B.aid in preventing turbocharger overheating

C.condense and drain moisture from exhaust gases

D.dampen exhaust gas pulsations in the manifold


正确答案：A
解析：water jacket：水套;exhaust manifold：排气总管;heat radiation：热辐射;condense and drain moisture from exhaust gases:将水分从排气中冷凝析出;dampen exhaust gas pulsations in the manifold：缓解排气总管中的废气脉动
译文：环绕排气总管的水套是为了减少对机舱的热辐射。

第4题：

单选题
Excessive diesel engine back pressure may be an indication of （）
A

carbon buildup in the exhaust manifold

B

overcooling of the exhaust manifold

C

eroded muffler baffle plates

D

high injection pressure


正确答案： D
解析： 暂无解析

第5题：

单选题
A sudden drop in diesel engine cylinder compression pressure can be caused by（）
A

a leaking fuel injector nozzle

B

a clogged air filter

C

excessively early fuel injection

D

malfunctioning valves


正确答案： A
解析： 暂无解析

第6题：

单选题
The process of loop scavenge is that the exhaust will be via ports （） the air ports and controlled by the same piston.
A

behind

B

far from

C

adjacent to

D

in front of


正确答案： A
解析： 暂无解析

第7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8题：

A dry-type spark arrestor removes sparks from a diesel engine exhaust by ____.

A.increasing the linear velocity of the exhaust gases

B.changing directions of exhaust gas flow

C.decreasing the temperature of the exhaust gases

D.accelerating the exhaust gas through a reduced size orifice


正确答案：B

第9题：

单选题
Diesel engine mufflers or silencers reduce the engine exhaust noise by （）
A

passing the exhaust through long head pipes

B

diffusing exhaust vibrations through activated carbon baffles

C

increasing the exhaust gas velocity

D

reducing the exhaust gas velocity


正确答案： D
解析： 暂无解析

第10题：

单选题
Diesel engine exhaust noise can be reduced in an exhaust muffler by （）
A

changing the direction of exhaust gas flow

B

increasing the exhaust gas velocity

C

changing the exhaust gas weight

D

increasing the exhaust gas static pressure


正确答案： D
解析： 暂无解析

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