海船船员考试

单选题When inspecting piston rings through the ports of a two-stroke/cycle diesel engine, black areas on the sealing surfaces are the result of （）A insufficient lubricationB improper piston coolingC blow-byD overload operation

题目
单选题
When inspecting piston rings through the ports of a two-stroke/cycle diesel engine, black areas on the sealing surfaces are the result of （）
A

insufficient lubrication

B

improper piston cooling

C

blow-by

D

overload operation

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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
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
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： D
解析： 暂无解析

第5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

第6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7题：

单选题
In a diesel engine, when refitting piston rings you should （） Ⅰ.check the ring gap at the smallest diameter of the cylinder Ⅱ. Remove carbon from the ring groove
A

Ⅰ only

B

Ⅱ only

C

both Ⅰ and Ⅱ

D

neither Ⅰ nor Ⅱ


正确答案： D
解析： 暂无解析

第8题：

单选题
The fresh air coming in through the inner air ports, is compressed by（） to a higher pressure.
A

the cylinder head

B

the cross-head

C

the moving piston

D

the stationary piston


正确答案： B
解析： 暂无解析

第9题：

单选题
Visual inspection of chrome-plated piston compression rings reveals a black ring face at the position of the cylinder liner portsThis condition indicates a ring which（）
A

has a crown-face

B

exceeds wear limits through normal wear

C

has excessive blow-by

D

is in good condition


正确答案： D
解析： 暂无解析

第10题：

单选题
In a medium speed diesel engine, a trunk type piston may be cooled by（） Ⅰ.oil circulation though passages in the piston crown Ⅱ.heat transfer through piston rings and liner wall
A

Ⅰ only

B

Ⅱ only

C

either Ⅰ or Ⅱ

D

neither Ⅰ or Ⅱ


正确答案： D
解析： 暂无解析

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