Prolonged operation of a diesel engine with a closed cooling water system, at lower than normal designed operating temperatures can ______.A.increase power outputB.decrease lube oil viscosityC.eliminate fuel knockD.cause sulfuric acid formation

题目

Prolonged operation of a diesel engine with a closed cooling water system, at lower than normal designed operating temperatures can ______.

A.increase power output

B.decrease lube oil viscosity

C.eliminate fuel knock

D.cause sulfuric acid formation

相似考题

1.If the coolant temperature of a closed cooling water system for a diesel enginegradually increases, the trouble usually is( ).A.a broken shaft on the freshwater pumpB.an excessive accumulation of scale in the heat exchangerC.an incorrect thermostatic element operating rangeD.lube oil in the cooling water

2.A two stroke diesel engine exhaust temperature will be lower than a four stroke diesel engine of the same displacement because the _____. ① MEP is lower and the scavenging air is cooling the exhaust gases ② valve overlap in a four strokeA.①B.②C.① and ②D.Neither ① nor ② is correct

3.High diesel engine cooling water temperatures can be caused by ______.A.air in the cooling systemB.an overhauled water pumpC.correct amount of coolantD.no air in the cooling system

4.In a diesel engine closed freshwater cooling system, the amount of coolant flowing through the heat exchanger is controlled by the __.A.suction pressure regulatorB.thermostatic bypass valveC.sea water temperatureD.water level in the expansion tank

参考答案和解析
正确答案：D
更多“Prolonged operation of a diesel engine with a closed cooling water system, at lower than n ”相关问题

  • 第1题：

    单选题
    If the coolant temperature of a closed cooling water system for a diesel engine gradually increases, the trouble usually is （）
    A

    a broken shaft on the freshwater pump

    B

    an excessive accumulation of scale exchanger

    C

    an incorrect thermostatic element operating range

    D

    lube oil in the cooling water


    正确答案： D
    解析： 暂无解析

  • 第2题：

    单选题
    Which of the following factors tends to increase scale formation on the saltwater side of a heat exchanger used in a diesel engine cooling water system?（）
    A

    Baffle plates that have been bent during prior removal

    B

    Leaks in the cooler tube nest

    C

    Operating the engine while maintaining a high sea water outlet temperature

    D

    A punctured sea water strainer supplying cooling water to the heat exchanger


    正确答案： C
    解析： 暂无解析

  • 第3题：

    单选题
    If the jacket water temperature in an auxiliary diesel engine cooling system is lower than normal, the probable cause is （）
    A

    air binding of the engine cooling system

    B

    a cracked water cooled exhaust manifold

    C

    blockage in the heat exchanger

    D

    faulty operation of the thermostat


    正确答案： B
    解析： 暂无解析

  • 第4题：

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

    air in the cooling system

    B

    an overhauled water pump

    C

    correct amount of coolant

    D

    no air in the cooling system


    正确答案： C
    解析： 暂无解析

  • 第5题：

    单选题
    The expansion tank for a diesel engine closed cooling system is designed to maintain a constant head on the system and （）.
    A

    reduce water temperature

    B

    reduce water turbulence

    C

    provide an air cushion

    D

    allow for an increase in water volume as the engine warms up


    正确答案： B
    解析： 暂无解析

  • 第6题：

    单选题
    In a diesel engine cooling system, the high temperature alarm contact maker will be activated on excessively high water discharge temperature from the （）
    A

    raw water pump discharge

    B

    expansion tank outlet

    C

    cooling water heat exchanger

    D

    outlet engine jacket water outlet


    正确答案： A
    解析： 暂无解析

  • 第7题：

    单选题
    If the water level dropped rapidly in the expansion tank of a closed diesel engine cooling water system, you should suspect a （）.
    A

    loss of suction in the circulating pump

    B

    leak in the primary cooling system

    C

    broken raw water pump shaft

    D

    burned or cracked piston in one cylinder


    正确答案： D
    解析： 暂无解析

  • 第8题：

    单选题
    In a closed diesel engine freshwater cooling system, the amount of coolant flowing through the heat exchanger is controlled by the （）.
    A

    suction pressure regulator

    B

    thermostatic bypass valve

    C

    sea water temperature

    D

    water level in the expansion tank


    正确答案： B
    解析： 暂无解析

  • 第9题：

    单选题
    A diesel engine cooling water system with a pH factor of 30 indicates a condition of （）.
    A

    slight acidity

    B

    slight alkalinity

    C

    excessive alkalinity

    D

    excessive acidity


    正确答案： D
    解析： 暂无解析

  • 第10题：

    单选题
    In any diesel engine closed freshwater cooling system, the lowest pressure exists at the （）.
    A

    jacket water outlet

    B

    cooling water pump outlet

    C

    heat exchanger outlet

    D

    expansion tank atmospheric vent


    正确答案： B
    解析： 暂无解析

  • 第11题：

    单选题
    There is （） in any water cooling system for a diesel engine allowing for expansion and water make-up in the system as well as air vent and chemicals addition.
    A

    a setting tank

    B

    a service tank

    C

    a head tank

    D

    an expansion joint


    正确答案： B
    解析： 暂无解析

  • 第12题：

    单选题
    The jacket water temperature in a diesel engine closed freshwater cooling system is normally controlled by （）
    A

    regulating the level of corrosion inhibitor in the primary cooling system

    B

    the level of the freshwater expansion tank

    C

    varying the engine load to meet temperature requirements

    D

    the operation of the thermostatic valve


    正确答案： B
    解析： 暂无解析

  • 第13题：

    单选题
    Lube oil accumulating in the cooling water system of a diesel engine will result in （）
    A

    lube cooler failure

    B

    poor heat transfer

    C

    mechanical lubricator failure

    D

    camshaft seizure


    正确答案： A
    解析： 暂无解析

  • 第14题：

    单选题
    The device allowing for the change in volume of the cooling water in a propulsion diesel engine closed cooling system is the （）.
    A

    fresh water expansion tank

    B

    sea water expansion tank

    C

    thermostatic expansion valve

    D

    jacket water cooler accumulator


    正确答案： D
    解析： 暂无解析

  • 第15题：

    单选题
    The satisfactory operation of diesel engine exhaust valves usually depends on（）
    A

    the proper back pressure

    B

    the cooling water temperature

    C

    correct timing and proper seating

    D

    accurate metering and the exhaust temperature


    正确答案： C
    解析： 暂无解析

  • 第16题：

    单选题
    In a closed cooling system for a turbocharged, four-stroke/cycle diesel engine, fluctuating water pressure can be caused by （）
    A

    improper venting of the cooling system

    B

    carrying the expansion tank water level too high

    C

    a totally clogged impeller in the cooling water pump

    D

    an incorrectly set cooling system temperature control


    正确答案： C
    解析： 暂无解析

  • 第17题：

    单选题
    The highest pressure in any closed diesel engine freshwater cooling system is at the （）.
    A

    jacket water outlet

    B

    expansion tank inlet

    C

    heat exchanger inlet

    D

    cooling water pump outlet


    正确答案： A
    解析： 暂无解析

  • 第18题：

    单选题
    In a diesel engine jacket water cooler, with seawater cooling the fresh water, the（）
    A

    sea water temperature must never be warmer than 40℃

    B

    jacket water pressure should always be greater than the sea water pressure

    C

    jacket water temperature must always be less than 60℃

    D

    jacket water pressure must always be less than the sea water pressure


    正确答案： C
    解析： 暂无解析

  • 第19题：

    单选题
    Which of the following problems can cause fluctuating pressures in the closed cooling system of a main propulsion diesel engine?（）
    A

    Defective temperature controls in the system

    B

    Cavitation in the cooling water pump

    C

    Opened vent in the cooling system

    D

    Restricted water passages in the engine


    正确答案： A
    解析： 暂无解析

  • 第20题：

    单选题
    Temperature control valves installed in the jacket cooling water system of a diesel engine modulates the rate of water flow through the （）.
    A

    cooling water pump

    B

    nozzle cooling passages

    C

    cylinder jackets

    D

    heat exchanger


    正确答案： D
    解析： 暂无解析

  • 第21题：

    单选题
    Operating a diesel engine for prolonged periods, with a closed freshwater cooling system, at temperatures lower than the normal design temperature can cause （）.
    A

    the formation of sulfuric acid

    B

    a decrease in lube oil viscosity

    C

    a decrease in cooling water pH

    D

    a thermostat failure


    正确答案： A
    解析： 暂无解析

  • 第22题：

    单选题
    In a diesel engine cooling water system, a pH of 60 indicates a/an （）.
    A

    slightly acidic condition

    B

    slightly alkaline condition

    C

    overtreatment of water

    D

    neutral condition of water


    正确答案： C
    解析： 暂无解析

  • 第23题：

    单选题
    In the process of the stand-by, warm-up the engine usually through give preheat of which parts of the diesel engine?（）
    A

    cooling water of the cooling system

    B

    fuel of the FO system

    C

    LO of the LO system

    D

    cooling water of the cooling system and LO of the LO system


    正确答案： A
    解析： 暂无解析

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