海船船员考试

单选题Diesel engine mufflers or silencers reduce the engine exhaust noise by （）A passing the exhaust through long head pipesB diffusing exhaust vibrations through activated carbon bafflesC increasing the exhaust gas velocityD reducing the exhaust gas velocit

题目
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

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相似问题和答案

第1题：

Which lubricating oil additive is used in diesel engines to reduce the tendency(倾向)for sludge and varnish to form on the engine parts?

A.Flash point improvers

B.Pour point improvers

C.Inhibitors

D.Foam suppressors(抑制物)


正确答案：C

第2题：

单选题
During the running of the diesel engine, if the supply of cooling water is interrupted or the temperature of cooling water out of the cylinder is too high, the duty engineer should （）
A

notify the duty officer, reduce the engine speed, take some measures to remove failures

B

notify the duty officer and stop the engine immediately, find the cause and remove failures

C

notify the C/E

D

notify the captain


正确答案： A
解析： 暂无解析

第3题：

If the jacket water temperature rises rapidly above normal in a diesel engine, you should first

A.place standby cooler in operation

B.reduce engine load

C.check thermostatic valve

D.clean sea water strainer


正确答案：B

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
As a heat engine,（） energy is the source of power by which the diesel engine can be operated.
A

electric

B

heat

C

mechanical

D

exhaust


正确答案： D
解析： 暂无解析

第6题：

单选题
The marine diesel engine is a type of diesel engine used on ships The （） of its operation is not very difficult to understand.
A

principle

B

principal

C

cause

D

case


正确答案： D
解析： 暂无解析

第7题：

单选题
Before shutting off the fuel supply to stop a medium or high–speed diesel engine, why is it necessary to allow the engine to idle for a few minutes?（）
A

To prevent internal damage form local overheating

B

To ensure the fuel nozzles are flushed clean

C

To clear the smoke stack

D

To let the waste heat boiler reduce its rate of steam generation


正确答案： D
解析： 暂无解析

第8题：

Which of the following problems should be taken when cleaning the air filter on a diesel engine equipped with a turbocharger? .

A.Reduce engine speed to idle before removing the filter

B.Soak the dirty filter in kerosene only

C.Blow out the air inlet with compressed air

D.Cover the air inlet after removing the filter


正确答案：D

第9题：

单选题
A supercharged diesel engine when compared to a similar naturally aspirated diesel engine, will develop an increase in （）
A

ignition lag

B

engine horsepower

C

lube oil system pressure

D

specific fuel consumption


正确答案： D
解析： 暂无解析

第10题：

单选题
While a ship with twin screw is making a turn, in order to prevent overload, the duty engineer should （）
A

reduce the fuel feeding of main engine of inner propeller

B

reduce the fuel feeding of main engine of outer propeller

C

firstly reduce the fuel of main engine of inner propeller, then reduce the fuel feeding of engine of outer propeller

D

reduce fuel feeding of two engines at the same time


正确答案： A
解析： 暂无解析

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