海船船员考试

单选题While inspecting the main bearings on a diesel engine you find impregnated dirt and scratches in the bearing surface you would, therefore, suspect that （）A the bearing had been overheatedB water was present in the oilC the lube oil was not being proper

题目
单选题
While inspecting the main bearings on a diesel engine you find impregnated dirt and scratches in the bearing surface you would, therefore, suspect that （）
A

the bearing had been overheated

B

water was present in the oil

C

the lube oil was not being properly filtered

D

the maximum allowable bearing pressure had been exceeded

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相似问题和答案

第1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：

Proper lubrication of the main bearings is more easily obtained in a single acting, four-stroke/cycle diesel engine than in a tow-stroke/cycle diesel engine because________.

A.The direction of pressure on the journal in four-stroke engine is continuously

B.positive feed lubricators are installed on all bearings of four-stroke engine, whereas as a splash feed system is used on tow-stroke engine

C.four-stroke engines usually utilize a heavier grade of oil than tow-stroke engines

D.Low-stroke engines usually consume less lube oil than four-stroke engines


正确答案：A

第4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

第5题：

单选题
The highest loads applied to the diesel engine crankshaft main bearings are （）
A

axial loads

B

firing loads

C

inertia loads

D

centripetal loads


正确答案： C
解析： 暂无解析

第6题：

单选题
Diesel engine main and connecting rod precision bearings are made in halvesEach half exceeds one-half the bearing circumference by a small amountThe small amount is termed （）.
A

clearance

B

crush

C

pitch

D

thrust


正确答案： C
解析： 暂无解析

第7题：

单选题
On most modern diesel engines, the main and connecting rod bearings receive their lubricating oil by （）.
A

banjo feed

B

splash feed

C

gravity feed

D

pressure feed


正确答案： B
解析： 暂无解析

第8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9题：

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


正确答案： B
解析： 暂无解析

第10题：

单选题
You are inspecting the lower main precision bearings on a diesel engine.You observe that about half the thin Babbitt linings are of a milky white colourThis condition is caused by （）
A

large dirt particles in the oil supply

B

insufficient lubricating oil and overheating

C

normal wear

D

water contamination of the lube oil


正确答案： A
解析： 暂无解析

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