单选题An increase in diesel engine crankcase pressure generally indicates excessive（）A compression pressureB lube oil header pressureC scavenge air pressureD piston ring blow-by

题目
单选题
An increase in diesel engine crankcase pressure generally indicates excessive（）
A

compression pressure

B

lube oil header pressure

C

scavenge air pressure

D

piston ring blow-by

相似考题

1.Any increase in the exhaust back pressure of a four-stroke/cycle diesel enginewill( ).A.reduce engine horsepower outputB.aid in silencing the exhaust noiseC.increase the mean effective pressureD.contribute to effective cylinder scavenging

2.单选题Which of the diesel engine components listed increase air density and helps to improve engine operating efficiency?（）A ImpellerB CompressorC After-coolerD Exhaust differ

3.单选题Water accumulating in the crankcase of a diesel engine could indicate（）A a cracked cylinder linerB excessive water in the fuelC a leaking intercoolerD excessive moisture in the scavenge air

4.A sudden power loss from a turbocharged and after-cooled diesel engine is an indication of a/anA.turbocharger malfunction or failureB.crankcase exhauster overloadC.overload on the intercoolerD.obstruction in the engine cylinders

更多“An increase in diesel engine crankcase pressure generally in”相关问题

  • 第1题：

    单选题
    The starting of a marine diesel engine is generally carried out with the assistance of （）.
    A

    compressed air

    B

    electricity

    C

    hydraulic oil

    D

    compressing air


    正确答案： A
    解析： 暂无解析

  • 第2题：

    单选题
    Large crosshead type engine generally has two lubrication systems, a function performed only by crankcase oil system is（）
    A

    lubricating

    B

    cooling

    C

    cleaning

    D

    neutralizing


    正确答案： A
    解析： 暂无解析

  • 第3题：

    单选题
    Excessive diesel engine back pressure may be an indication of （）
    A

    carbon buildup in the exhaust manifold

    B

    overcooling of the exhaust manifold

    C

    eroded muffler baffle plates

    D

    high injection pressure


    正确答案： D
    解析： 暂无解析

  • 第4题：

    单选题
    What occurs in the combustion space of a diesel engine cylinder shortly after ignition and before the piston reaches TDC?（）
    A

    Rapid increase in temperature with constant pressure

    B

    Rapid increase in pressure with constant temperature

    C

    Rapid increase in pressure and temperature

    D

    Rapid increase in volume and decrease in pressure


    正确答案： C
    解析： 暂无解析

  • 第5题：

    单选题
    An increase in crankcase pressure generally indicates（）
    A

    worn connecting rod bearings

    B

    worn engine cylinder liners

    C

    high cylinder firing pressure

    D

    stuck spring-loaded manhole covers


    正确答案： D
    解析： 暂无解析

  • 第6题：

    单选题
    In a diesel engine, blow-by（）
    A

    increase exhaust back pressure

    B

    causes excessive crankcase pressure

    C

    can only be detected by a compression check

    D

    decreases fuel consumption


    正确答案： C
    解析： 暂无解析

  • 第7题：

    单选题
    A turbocharged diesel engine will have an intake manifold pressure（）
    A

    constantly decreasing as engine load increase

    B

    constantly increasing as the amount of supercharging increases

    C

    approximately equal to exhaust manifold pressure at all times

    D

    approximately equal to atmospheric pressure at all times


    正确答案： A
    解析： 暂无解析

  • 第8题：

    单选题
    A naturally aspirated diesel engine at full throttle will have an intake manifold pressure （）
    A

    slightly less than atmospheric pressure

    B

    approximately equal to exhaust manifold pressure at all times

    C

    that is widely fluctuating constantly

    D

    decreasing as engine load increases


    正确答案： A
    解析： 暂无解析

  • 第9题：

    单选题
    Any increase in the exhaust back pressure of a four-stroke/cycle diesel engine will （）.
    A

    reduce engine horsepower output

    B

    aid in silencing the exhaust noise

    C

    increase the mean effective pressure

    D

    contribute to effective cylinder scavenging


    正确答案： C
    解析： 暂无解析

  • 第10题：

    单选题
    A diesel engine crankcase ventilation system （）
    A

    prevents spark generation

    B

    removes combustible gases

    C

    determines the level of combustible gases

    D

    provides inert gas generation in crankcase


    正确答案： A
    解析： 暂无解析

  • 第11题：

    单选题
    How dose water enter the crankcase of a diesel engine?（）
    A

    Through the crankcase exhauster

    B

    As water vapor contained in blow-by

    C

    Demulsifying lube oil passing through the main bearings

    D

    Condensation from vapor formed in the expansion tank


    正确答案： B
    解析： 暂无解析

  • 第12题：

    单选题
    If a crankcase explosion occurs in a diesel engine, which of the listed actions should be taken?（）
    A

    Open the crankcase immediately to check for damage

    B

    Apply fire fighting water through the crankcase breather

    C

    Allow the engine to cool before opening the crankcase

    D

    Assume that there is no damage to the crankshaft


    正确答案： C
    解析： 暂无解析

  • 第13题：

    单选题
    A supercharged diesel engine when compared to a similar naturally aspirated diesel engine, will develop an increase in （）
    A

    ignition lag

    B

    engine horsepower

    C

    lube oil system pressure

    D

    specific fuel consumption


    正确答案： D
    解析： 暂无解析

  • 第14题：

    单选题
    If a crankcase explosion has occurred in a diesel engine, and the crankcase remains intact, which of following precautions should be observed?（）
    A

    The cylinder indicator cocks should be opened

    B

    The sump lube oil scavenge pump should be secured immediately

    C

    The explosion relief valves should be manually opened

    D

    The crankcase should remain unopened until the engine has cooled


    正确答案： B
    解析： 暂无解析

  • 第15题：

    单选题
    Regarding a Diesel engine crankcase, the general arrangement and installation should preclude the possibility of （）
    A

    free entry of air to the crankcase

    B

    water entering the crankcase while engine wash-downs are being performed

    C

    excessive oil leakage during periods of increased blow-by

    D

    sub-cooling internal components


    正确答案： D
    解析： 暂无解析

  • 第16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17题：

    单选题
    Diesel engine ‘blow-by’ into the crankcase is caused by excessive ring（）
    A

    back clearance

    B

    side clearance

    C

    gap clearance

    D

    taper clearance


    正确答案： A
    解析： 暂无解析

  • 第18题：

    单选题
    Proper lubrication of the main bearing is more easily obtained in a single acting four-stroke/cycle diesel engine than in a single acting two-stroke/cycle diesel engine because （）
    A

    bearing pressure in a four-stroke/cycle acting single diesel engine is continually reversed

    B

    bearing pressure in a two-stroke/cycle single acting diesel engine is continually reversed

    C

    the maximum bearing pressure is higher in a single acting two-stroke/cycle diesel engine

    D

    two-stoke/cycle diesel engines require more complicated lubrication piping


    正确答案： B
    解析： 暂无解析

  • 第19题：

    单选题
    If a crankcase explosion occurs in a diesel engine, you should stop the engine and（）
    A

    immediately open all crankcase relief ports

    B

    increase crankcase exhauster speed to draw cool air into the engine

    C

    allow the engine to cool naturally

    D

    increase crank case scavenge air to remove unburned gases


    正确答案： D
    解析： 暂无解析

  • 第20题：

    单选题
    If cooling water flow through the after-cooler is interrupted,the power output of a turbocharged diesel engine will drop because the （）
    A

    turbocharger will stall

    B

    density of the air charge will decrease

    C

    scavenge effect will increase

    D

    exhaust pressure will increase


    正确答案： D
    解析： 暂无解析

  • 第21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22题：

    单选题
    The most common instrument used to measure diesel engine exhaust pressure is the （）
    A

    pyrometer

    B

    bourdon gauge

    C

    pneumercator

    D

    manometer


    正确答案： B
    解析： 暂无解析

  • 第23题：

    单选题
    An increase in the air inlet manifold pressure of a diesel engine will result in a/an （）.
    A

    decrease in maximum cylinder pressure

    B

    increase in ignition lag

    C

    decrease in fuel consumption per horsepower-hour

    D

    decrease in exhaust manifold pressure


    正确答案： C
    解析： 暂无解析

相关内容