单选题Worn main bearings in a diesel engine can result in （）A decreased compression pressureB increased lube oil pressureC lower lube oil temperatureD excessive leakage past the piston rings

题目
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

相似考题

1.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 continuouslyB.positive feed lubricators are installed on all bearings of four-stroke engine, whereas as a splash feed system is used on tow-stroke engineC.four-stroke engines usually utilize a heavier grade of oil than tow-stroke enginesD.Low-stroke engines usually consume less lube oil than four-stroke engines

2.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 clearanceB crushC pitchD thrust

3.单选题Worn main bearing will cause the compression ratio of an auxiliary diesel engine to（）A increaseB decreaseC remain the sameD increase on compression decrease on expansion

4.单选题A diesel engine cylinder head can crack as a result of （）A a leaking seal ringB heat transfer from exhaust valvesC restricted cooling passagesD overheated intake valves

更多“Worn main bearings in a diesel engine can result in （）”相关问题

  • 第1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2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3题：

    单选题
    In a four-cycle diesel engine piston blow-by can result in increased（）
    A

    crankcase pressure

    B

    compression pressure

    C

    scavenge pressure

    D

    exhaust manifold pressure


    正确答案： A
    解析： 暂无解析

  • 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
    Late fuel oil injection in a diesel engine can result in （）
    A

    fuel knock

    B

    increased power

    C

    low compression pressure

    D

    high exhaust temperature


    正确答案： D
    解析： 暂无解析

  • 第6题：

    单选题
    Worn diesel engine intake valve guides can result in （）
    A

    increased engine breathing efficiency

    B

    excessive valve lash

    C

    excessive lube oil consumption

    D

    lower than normal fuel consumption


    正确答案： B
    解析： 暂无解析

  • 第7题：

    单选题
    In a four-stroke/cycle diesel engine, badly worn intake valve guides can cause excessive（）.
    A

    exhaust pressure

    B

    exhaust temperatures

    C

    cooling water temperatures

    D

    lube oil consumption


    正确答案： D
    解析： 暂无解析

  • 第8题：

    单选题
    For a main diesel engine the lube oil in the bearings is drawn from （）, usually located in the bedplate.
    A

    a gravity tank

    B

    a sump

    C

    a vessel

    D

    a bottle


    正确答案： A
    解析： 暂无解析

  • 第9题：

    单选题
    An increase in the load on a turbocharged diesel engine operating at constant speed will result in an increase in （）
    A

    exhaust

    B

    air box pressure

    C

    brake main effective pressure

    D

    all of the above


    正确答案： A
    解析： 暂无解析

  • 第10题：

    单选题
    Engine coolant accumulating in the diesel engine lubricating oil can result from a （）
    A

    low oil pressure

    B

    high coolant pressure

    C

    leaking fuel injector

    D

    cracked cylinder head or liner


    正确答案： D
    解析： 暂无解析

  • 第11题：

    单选题
    In a normally operating diesel engine, the main cause of lubricating oil contamination in the crankcase is a result of the （）.
    A

    metal particles loosened by wear

    B

    air when no air cleaners are used

    C

    condensation of water vapors

    D

    breakdown of the lubricating oil by dilution


    正确答案： B
    解析： 暂无解析

  • 第12题：

    单选题
    High diesel engine cooling water temperatures can be caused by （）.
    A

    a worn water pump

    B

    not enough coolant

    C

    air in the cooling system

    D

    all of the above


    正确答案： C
    解析： 暂无解析

  • 第13题：

    单选题
    White smoke exhausting from a diesel engine can result from （）
    A

    high exhaust temperature

    B

    high lube oil temperature

    C

    low turbo-charger speed

    D

    low cooling water temperature


    正确答案： A
    解析： 暂无解析

  • 第14题：

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

    chromium plating piston rings

    B

    knurling the piston skirt

    C

    extended maximum power operation

    D

    applying load to a cold diesel engine


    正确答案： D
    解析： 暂无解析

  • 第15题：

    单选题
    Low compression of diesel engine may result from （）
    A

    a worn cylinder

    B

    broken piston rings

    C

    any of A and B

    D

    none of the above


    正确答案： A
    解析： 暂无解析

  • 第16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

  • 第17题：

    单选题
    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： B
    解析： 暂无解析

  • 第18题：

    单选题
    In a diesel engine, blow-by is generally the result of worn（）
    A

    valve guides

    B

    oil control rings

    C

    valve seats

    D

    compression rings


    正确答案： D
    解析： 暂无解析

  • 第19题：

    单选题
    On a medium-speed main propulsion diesel engine, the crank-pin or crank journal bearings receive lubricating oil from （）.
    A

    a spindle lubricator

    B

    an oil jet

    C

    internal splashing

    D

    drilled passages in the crankshaft


    正确答案： C
    解析： 暂无解析

  • 第20题：

    单选题
    The crankshaft of diesel engine is supported by （）.
    A

    tension stretch

    B

    tie rods

    C

    through bolts

    D

    main bearings


    正确答案： D
    解析： 暂无解析

  • 第21题：

    单选题
    Low compression pressure in a diesel engine may be the result of （）
    A

    insufficient fuel supply due to fuel pump valves sticking or leaking

    B

    excessive mechanical clearance between the piston crown and cylinder head

    C

    excessively worn fuel pump plunger

    D

    excessive exhaust back pressure


    正确答案： A
    解析： 暂无解析

  • 第22题：

    单选题
    Diesel engine lube oil can become contaminated as a result（）
    A

    the water produced during combustion

    B

    the sulfur in the fuel

    C

    unburned fuel oil

    D

    all of the above


    正确答案： C
    解析： 暂无解析

  • 第23题：

    单选题
    High lube oil temperatures developing in a diesel engine can result from（）
    A

    high oil pressure

    B

    excessive bearing end play

    C

    plugged oil control rings

    D

    engine overload


    正确答案： A
    解析： 暂无解析

相关内容