海船船员考试

单选题One method of constructing large marine diesel engines and reducing the total engine frame weight is through （）.A casting interlocking componentsB welding plates to form sections for assemblyC forging integral componentsD case hardening integral compon

题目
单选题
One method of constructing large marine diesel engines and reducing the total engine frame weight is through （）.
A

casting interlocking components

B

welding plates to form sections for assembly

C

forging integral components

D

case hardening integral components

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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
One of the purposes for water cooling the exhaust manifold in marine diesel engine is to （）
A

reduce lube oil temperature

B

raise exhaust temperature reduce

C

excessive heating of engine room

D

reduce load on cooling water pump


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
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


正确答案： D
解析： 暂无解析

第5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6题：

单选题
One major disadvantage of a low-speed diesel as compared to a steam main-propulsion system is（）.
A

the extra weight required for the diesel reduction gearing

B

a minimum speed for the engines that limits the minimum speed of the vessel

C

the higher fuel consumption per SHP

D

the low efficiency of the system when a controllable pitch propeller is used


正确答案： C
解析： 暂无解析

第7题：

单选题
Typical marine propulsion plants include（） directly coupled to the vessel’s single large-diameter, fixed-pitch propeller.
A

a single, long-stroke, slow-speed, turbocharged, two-stroke diesel engine

B

a single, long-stroke, medium-speed, turbocharged, four-stroke diesel engine

C

two medium-speed, turbocharged, four-stroke diesel engines

D

a variable-speed AC generator


正确答案： A
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
Mist detectors used on large low-speed main propulsion diesel engines monitor and check for the presence of （）.
A

fuel oil vapor at the sludge tank vent

B

unburned fuel vapors in the scavenge air receiver

C

lube oil vapors in the crank case

D

lube oil vapors in the engine room


正确答案： C
解析： 暂无解析

第10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

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