海船船员考试

单选题Large marine diesel engines of crosshead construction generally have two systems of lubrication: a total loss system feeding the （） and a recirculation system lubricating the running gear and cooling the piston.A cylinder liners and piston ringsB main

题目
单选题
Large marine diesel engines of crosshead construction generally have two systems of lubrication: a total loss system feeding the （） and a recirculation system lubricating the running gear and cooling the piston.
A

cylinder liners and piston rings

B

main bearings

C

crankpin bearings

D

turboblower

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相似问题和答案

第1题：

Vessels required to be equipped with an approved backfire flame arrester are ______．

A.Those with diesel engines

B.All those with gasoline engines

C.Those with large engines only

D.None of the above


正确答案：B

第2题：

单选题
The main function of tie rods in the construction of large, low speed diesel engines is to（）.
A

stiffen the bedplate in way of the main bearings to increase the engines longitudinal strength

B

accept most of the tensile loading that results from the firing forces developed during operation

C

mount the engine frame securely to the hull to prevent shaft coupling misalignment

D

connect the crosshead solidly to the piston rod


正确答案： C
解析： 暂无解析

第3题：

Cylinders of marine diesel engines are normally cooled by ___ .

A.sea water

B.fine mineral oil

C.sanitary water

D.fresh water


正确答案：D

第4题：

单选题
Following the failure of one turbocharger on a large, crosshead, main propulsion diesel engine, fitted with multiple turbochargers, which of the following actions should be taken prior to further operation of the engine? （）
A

Blank off the exhaust gas inlet to the damaged turbocharger

B

Secure cooling and lubrication to the damaged turbocharger

C

Lock the rotor of the damaged turbocharger

D

All of the above


正确答案： C
解析： 暂无解析

第5题：

单选题
（）, so they are widely used on board ship nowadays.
A

Diesel engines have more advantages in comparison with gasoline engines

B

Diesel engines have more advantages in comparison to gasoline engines

C

Gasoline engines have more advantages in comparison with diesel engines

D

Gasoline engines have more advantages in comparison to diesel engines


正确答案： D
解析： 暂无解析

第6题：

单选题
In large marine diesel engines cylinder oils usually contain additives formulated to impart the （） to clean the rings and grooves.
A

inefficiency

B

oiliness

C

detergency

D

purity


正确答案： A
解析： 暂无解析

第7题：

单选题
Marine four-stroke diesel engines are mainly （）.
A

of crosshead type

B

of trunk piston type

C

of low speed type

D

all the above


正确答案： D
解析： 暂无解析

第8题：

Modern marine diesel engines equipped with mechanical fuel injection operate on a combustion phase within the cycle which is ______.

A.entirely constant pressure

B.entirely constant temperature

C.a combination of constant volume and constant pressure

D.a combination of constant temperature and constant pressure


正确答案：C

第9题：

单选题
Cooling water pumps driven by direct reversing diesel engines are usually of the straight impeller vane type pump with a concentric housing to（）
A

facilitate bi-directional operation

B

provide the greatest pump efficiency

C

prevent pump clogging from marine growth

D

prevent cavitation at the pump outlet


正确答案： A
解析： 暂无解析

第10题：

单选题
Cylinders of marine diesel engines are normally cooled by （）.
A

sea water

B

fine mineral oil

C

sanitary water

D

fresh water


正确答案： D
解析： 暂无解析

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