海船船员考试

单选题The power developed by a large slow-speed main propulsion diesel engine is dependent upon the （）A quantity of air it takes in and retains in the cylinders during a given time periodB proportion of trapped air that is utilized in the combustion processC

题目
单选题
The power developed by a large slow-speed main propulsion diesel engine is dependent upon the （）
A

quantity of air it takes in and retains in the cylinders during a given time period

B

proportion of trapped air that is utilized in the combustion process

C

thermodynamic efficiency of the engine cycle

D

all of the above

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相似问题和答案

第1题：

单选题
The rate of cylinder lubricating oil metered to each cylinder of a large low-speed main propulsion diesel engine is （）
A

the same, whether at sea, or during maneuvering

B

adjusted during each hour of operation while at constant RPM

C

higher at sea than while maneuvering

D

lower at sea than while maneuvering


正确答案： C
解析： 暂无解析

第2题：

单选题
While underway, which of the following would be the FIRST step in reversing a direct reversing large, low-speed, main propulsion, diesel engine?（）
A

Manually trip the over-speed device

B

Interrupt the fuel flow to the engine

C

Disengage the safety interlock

D

Slide the camshaft to the neutral position


正确答案： B
解析： 暂无解析

第3题：

The upper piston rings m large, slow-speed, two-stroke/cycle diesel engines are most effectively lubricated by oil ____.

A.fed from mechanical lubricators

B.thrown off from the main bearings

C.supplied from wick fed drip lubricators

D.flow from a centrifugal or banjo oiler


正确答案：A

第4题：

单选题
In order to start a large, low-speed, main propulsion diesel engine on high viscosity fuel after an extended shutdown, the （）
A

fuel must be preheated

B

intake air should be preheated

C

lube oil outlet temperature should be increased 20℃ above normal

D

none of the above


正确答案： B
解析： 暂无解析

第5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6题：

单选题
On a large low-speed main propulsion diesel engine, lower main bearing wear is usually measured by using a/an （）
A

dial indicator

B

outside caliper

C

bridge gauge

D

tram rod


正确答案： D
解析： 暂无解析

第7题：

单选题
Telescopic pipes to the piston of a large slow-speed main propulsion diesel engine are designed to prevent （）.
A

excessive crankcase pressure

B

excessive lube oil temperature

C

contamination of the lube oil by water

D

contamination of the cooling water by lube oil


正确答案： C
解析： 暂无解析

第8题：

The closing of the exhaust valves used on a modern, large, low-speed, main propulsion diesel engine may be directly provided by_______.

A.large conical springs

B.compressed air pressure

C.hydraulic pressure

D.exhaust gas pressure


正确答案：B

第9题：

单选题
The opening of an exhaust valve on a modem, large, low-speed, main propulsion diesel engine may be actuated by （）.
A

direct action of cam shaft

B

compressed air pressure

C

hydraulic “push rods”

D

direct action of the main piston moving down


正确答案： A
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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