海船船员考试

单选题The primary purpose of oil control rings on a diesel piston is to（）A provide a reservoir for cylinder lubricationB pump oil into the combustion space for cylinder coolingC prevent excessive lubricating oil consumptionD allow hydraulic oil film formatio

题目
单选题
The primary purpose of oil control rings on a diesel piston is to（）
A

provide a reservoir for cylinder lubrication

B

pump oil into the combustion space for cylinder cooling

C

prevent excessive lubricating oil consumption

D

allow hydraulic oil film formation on the cylinder

参考答案和解析
正确答案： A
解析： 暂无解析
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相似问题和答案

第1题：

单选题
If the piston groove drain holes for the oil control rings become clogged, which of the following is likely to occur?（）
A

The oil control rings will seal improperly and wear rapidly

B

The piston will overheat due to insufficient lubrication

C

Excessive oil will remain on the cylinder wall

D

Light brown smoke will emanate from the engine exhaust


正确答案： B
解析： 暂无解析

第2题：

单选题
To function properly, oil control rings used on a diesel engine piston must distribute sufficient oil to all parts of the cylinder wall and must also（）.
A

prevent any lubricant from reaching

B

prevent excessive lubrication from reaching the combustion space

C

Provide metal-to-metal contact to seal the cylinder against blow-by

D

assure a positive means of scraping carbon accumulation from the cylinder


正确答案： C
解析： 暂无解析

第3题：

Which of the following statements represents the function of the compression rings installed at the top of a diesel Engine piston?

A.Control the amount of lube oil burned in the combustion chamber

B.Transmit heat from the piston to the cylinder liner

C.Prevent damage to ring groove inserts by acting as a heat dam

D.Dissipate combustion chamber gas pressure by channeling it through the ring gap


正确答案：B

第4题：

单选题
For diesel engine piston cooling, lubricating oil can be supplied to the pistons by a/an （）.
A

oil spray

B

oil bath

C

oil control rings

D

drilled passage through the camshaft


正确答案： B
解析： 暂无解析

第5题：

单选题
In order to keep excess oil from the intake ports in two-stroke/cycle diesel engines, （）
A

wide compression rings are used

B

oil rings are located above the piston

C

chromium plating is used on all piston rings

D

oil rings are located near the bottom of the piston skirt


正确答案： C
解析： 暂无解析

第6题：

单选题
Worn main bearings in a diesel engine can result in （）
A

decreased compression pressure

B

increased lube oil pressure

C

lower lube oil temperature

D

excessive leakage past the piston rings


正确答案： D
解析： 暂无解析

第7题：

单选题
The film of oil between the rings and the liner is not only essential for the lubrication but also plays an important part in achieving （）.
A

an oil seal

B

removing heat

C

a gas seal

D

cooling the piston


正确答案： D
解析： 暂无解析

第8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9题：

单选题
Scuffed cylinder liner wearing surfaces in a diesel engines can result from （）
A

starting the engine while hot

B

knurling the piston skirt

C

operating the engine overheated

D

scuff resistant piston rings


正确答案： D
解析： 暂无解析

第10题：

单选题
Improper cooling of a diesel engine cylinder liner due to the accumulation of scale deposits may cause （）.
A

low compression pressure

B

increased piston wear

C

increased cylinder lube oil consumption

D

poor contact between compression rings and liner


正确答案： B
解析： 暂无解析

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