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Black areas on the sealing surfaces of piston rings indicate

题目
单选题
Black areas on the sealing surfaces of piston rings indicate（）
A

lube oil pumping

B

rotating rings

C

gas pressure behind the ring

D

passage of hot gases

参考答案和解析
正确答案： D
解析： 暂无解析
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相似问题和答案

第1题：

Before replacing a piston you should check that all rings are ___.

A.free

B.fastened

C.broken

D.stuck


正确答案：A

第2题：

单选题
The lowest ring of a piston is （）.
A

a coil spring

B

a sealing ring

C

an oil distributor ring

D

main seal ring


正确答案： C
解析： 暂无解析

第3题：

The sealing rings are in four parts and pressed together around the piston rods by means of _____

A.nuts

B.bolts

C.coil springs

D.stuffing boxes


正确答案：C

第4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5题：

单选题
Insufficient end clearance on newly fitted piston rings in a diesel enginewill cause the rings to（）
A

jam in the most worn part of the cylinder when the rings expand

B

break in the most worn part of the cylinder when the rings expand

C

wear eccentrically on the side opposite the end gap

D

overheat and jam at the top center on the combustion stroke


正确答案： A
解析： 暂无解析

第6题：

单选题
Around the combustion chamber, all the main components are to give low thermal strains and the smallest, circumferentially symmetric deformations for good sealing between piston rings and liner（）
A

drill cooled

B

hole cooled

C

tube cooled

D

bore cooled


正确答案： A
解析： 暂无解析

第7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8题：

Among the rings of a piston the ______one is subjected to the greatest load and temperature.

A.bottom

B.middle

C.top

D.any position


正确答案：C

第9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10题：

单选题
When good and steady service conditions have been achieved, the running surfaces of the piston rings and cylinder liner will be（）In addition, the rings will move freely in the grooves and also be well oiled intact, and not unduly worn.
A

hazy light

B

hazy light brown

C

hazy light blue

D

hazy light grey


正确答案： A
解析： 暂无解析

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