A combination of corrosion and erosion caused wastage in the main ballast line，which directly led to the leak ______．A.draffB.wastageC.mullockD.obsolete

题目

A combination of corrosion and erosion caused wastage in the main ballast line，which directly led to the leak ______．

A.draff

B.wastage

C.mullock

D.obsolete

相似考题

1.If an auxiliary diesel engine coolant temperature is higher than normal, but the thermostat is determined not to be defective, you would suspect a/anA.cavitation erosion in the water jacketsB.excess corrosion inhibitor in the coolantC.dirty jacket water coolerD.defective turbocharger

2.A segregated ballast system is a system whereA.all ballast is processed through the oily water separatorB.ballast is taken on and discharged through a separate main deckC.ballast and cargo tanks are separated by cofferdamsD.all ballast lines, tanks, and pumps are independent of those used for oil

3.The boiler water alkalinity in a coil-type auxiliary boiler should be maintained at the pH recommended by the boiler manufacturer to______.A.precipitate(使沉淀) silica （硅石）from solutionB.reduce corrosion in the heating coilC.prevent clogging and erosion in the coilD.maintain zero water hardness

4.While sailing in ballast under normal weather and sea condition, the basic parameter which is used to restrict the fuel injection of main engine isA.the exhaust temperatureB.the speed of main engineC.the turbine rotation speedD.the power of main engine

更多“A combination of corrosion and erosion caused wastage in the main ballast line,which direc ”相关问题

  • 第1题：

    A bypass line provided around a waste heat auxiliary boiler in a diesel engine exhaust system, may be used to avoid boiler ______.

    A.corrosion at low engine loads

    B.erosion at high engine loads

    C.overload at high engine loads

    D.scaling at all exhaust temperatures


    正确答案：A

  • 第2题：

    材料：

    Spark erosion is caused by a voltage discharge between the main bearing and journal surface. The cause of the potential is the development of a galvanic element between the ship’s hull, sea water, and the propeller shaft/crankshaft.

    The oil film acts as a dielectric. The puncture voltage in the bearing depends on the thickness of the oil film. With increasing engine ratings, the specific load in the main bearing is increased. his will reduce the oil film thickness, and enable the discharge to take place at a lower voltage level.

    Since the hydrodynamic oil film thickness varies through a rotation cycle, the discharge will take place at roughly the same instant during each rotation cycle, i.e. when the film thickness is at its minimum. The roughening will accordingly be concentrated in certain areas on the journal surface. In the early stages, the roughened areas can resemble pitting erosion. but later, as the roughness increases, the small craters will scrape off and pick up white metal-hence the silvery white appearance.

    Therefore, to ensure protection against spark erosion, the potential level must be kept at maximum 80 mV, which is feasible today with a high efficiency earthing device. If an earthing device is installed, its effectiveness must be checked regularly. Spark erosion is only observed in main bearings and main bearing journals.

    问题：

    According to the paragraph one, a voltage between the main bearing and journal surface is produced by______.

    A.propeller rotation

    B.leakage from M/E electric control unit

    C.a galvanic element

    D.friction between the main bearing and journal surface

    ______engine ratings increase, the hydrodynamic oil film between the main bearing and journal surface is______.A.The lower/thinner

    B.The higher/the thicker

    C.The lower/thicker

    D.The higher/thinner

    When will the spark erosion take place on the journal surface during each rotation cycle?A.when the film thickness is at its minimum

    B.when the film thickness is at its maximum

    C.when the engine is on its compression stroke

    D.when the engine is on its exhaust stroke

    During the engine room watch keeping, which equipment must be noted to ensure protection against spark erosion?A.the antifouling plant

    B.the earthing device

    C.the main engine electric heating coils

    D.the shaft generator

    请帮忙给出每个问题的正确答案和分析，谢谢！


    问题 1 答案解析：C


    问题 2 答案解析：D


    问题 3 答案解析：A


    问题 4 答案解析：B

  • 第3题：

    FONST3000OSCAD线路输出端口是（）。

    • A、LINE_O
    • B、LINE_I
    • C、MAIN_D
    • D、MAIN_A

    正确答案:A

  • 第4题：

    Given the following code：     1） class Parent {     2） private String name；     3） public Parent（）{}     4） }  5） public class Child extends Parent {     6） private String department；  7） public Child（） {}  8） public String getValue（）{ return name； }     9） public static void main（String arg[]） {     10） Parent p = new Parent（）；     11） }  12） }  Which line will cause error？（）   

    • A、 line 3
    • B、 line 6
    • C、 line 7
    • D、 line 8
    • E、 line 10

    正确答案:D

  • 第5题：

    单选题
    Corrosion and grooving on the blade of an exhaust driven turbocharger is caused by certain components of residual fuel oilsThese components are vanadium,sodium, and（）
    A

    copper

    B

    carbon

    C

    hydrogen

    D

    sulfur


    正确答案： B
    解析： 暂无解析

  • 第6题：

    单选题
    You are working on a debug build of an application.You need to find the line of code that caused an exception to be thrown. Which property of the Exception class should you use to achieve this goal？（）
    A

    Data

    B

    Message

    C

    Stack Trace

    D

    Source


    正确答案： C
    解析： 暂无解析

  • 第7题：

    单选题
    Which of the problems listed represents the major difficulty encountered with thermal expansion valve operation?（）
    A

    Lube oil passing through the system

    B

    Moisture or foreign matter collecting at the valve seat and orifice

    C

    Variable spring tension caused by the changing temperature

    D

    Frost on the liquid line


    正确答案： B
    解析： 暂无解析

  • 第8题：

    单选题
    The main engine is cooled with fresh water （）is added suitable small quantities of chemicals to prevent corrosion.
    A

    in which

    B

    on which

    C

    to which

    D

    by which


    正确答案： B
    解析： 暂无解析

  • 第9题：

    单选题
    Exhaust valve grooving and corrosion is caused by certain components of residual fuel oilThese components are sodium, sulfur, and （）.
    A

    vanadium

    B

    carbon

    C

    copper

    D

    ash


    正确答案： B
    解析： 暂无解析

  • 第10题：

    单选题
    The boiler water alkalinity in a coil-type auxiliary boiler should be maintained at the pH recommended by the boiler manufacturer to（）
    A

    precipitate silica from solution

    B

    reduce corrosion in the heating coil

    C

    prevent clogging and erosion in the coil

    D

    maintain zero water hardness


    正确答案： C
    解析： 暂无解析

  • 第11题：

    单选题
    Where tanks are arranged for either oil or ballast （） must be fitted in the pipe so that only the ballast main or the oil transfer main connected to the tank.
    A

    a sea water chest

    B

    a change-over chest

    C

    a buffer tank

    D

    a three-way valve


    正确答案： A
    解析： 暂无解析

  • 第12题：

    单选题
    Which measure should NOT be taken to reduce the pounding of a vessel in a head sea?（）
    A

    Add ballast in the afterpeak

    B

    Add ballast forward

    C

    Alter course

    D

    Reduce speed


    正确答案： C
    解析： 暂无解析

  • 第13题：

    Which of the problems listed could cause erosion of the expansion valve disks and seats?

    A.Overcharging the system with refrigerant

    B.Faulty compressor suction valve

    C.Failure of the high pressure cutout

    D.Flash gas formed in the liquid line


    正确答案：D

  • 第14题：

    Chafing gear ______.

    A.reduces and prevents corrosion of standing rigging

    B.prevents corrosion of running rigging

    C.reduces and prevents wear caused by the rubbing of one object against another

    D.protects the body against extreme cold


    正确答案：C

  • 第15题：

    正线 main line


    正确答案:指由区间连接车站并贯穿或直股伸入车站的线路。

  • 第16题：

    Which is the earliest line in the following code after which the object created on the line marked （0） will be a candidate for being garbage collected， assuming no compiler optimizations are done？ （）  public class Q76a9 {   static String f（） {   String a = "hello"；   String b = "bye"； // （0）   String c = b + "!"； // （1）   String d = b；  b = a； // （2）   d = a； // （3）   return c； // （4）  }   public static void main（String args[]） {   String msg = f（）；   System.out.println（msg）； // （5）   }   }  

    • A、The line marked （1）.
    • B、The line marked （2）.
    • C、The line marked （3）.
    • D、The line marked （4）.
    • E、The line marked （5）.

    正确答案:C

  • 第17题：

    单选题
    The main bearing shells often have a thin （） of lead or indium to provide a layer giving protection against corrosion.
    A

    flange

    B

    flash

    C

    plate

    D

    sheet


    正确答案： B
    解析： 暂无解析

  • 第18题：

    单选题
    A segregated ballast system is a system where （）
    A

    all ballast is processed through the oily water separator

    B

    ballast is taken on and discharged through a separate main deck riser

    C

    ballast and cargo tanks are separated by cofferdams

    D

    all ballast lines, tanks, and pumps are independent of those used for oil


    正确答案： C
    解析： 暂无解析

  • 第19题：

    单选题
    Chafing gear（）.
    A

    reduces and prevents corrosion of standing rigging

    B

    prevents corrosion of running rigging

    C

    reduces and prevents wear caused by the rubbing of one object against another

    D

    protects the body against extreme cold


    正确答案： B
    解析： 暂无解析

  • 第20题：

    单选题
    Fighting a rig fire in the ballast pumproom with hoses would adversely affect the stability of the rig most by（）.
    A

    increasing the permeability of the pumproom

    B

    reduction of drill water from the storage tanks

    C

    a list caused by water filling the compartment

    D

    a reduced KG caused by water filling the compartment


    正确答案： B
    解析： 暂无解析

  • 第21题：

    单选题
    If an auxiliary diesel engine temperature is higher than normal ,but the thermostat is determined not to be defective you would suspect a /an （）
    A

    cavitation erosion in the water jackets

    B

    excess corrosion inhibitor in the coolant

    C

    dirty jacket water cooler

    D

    defective turbocharger


    正确答案： C
    解析： 暂无解析

  • 第22题：

    单选题
    Which is the earliest line in the following code after which the object created on the line marked （0） will be a candidate for being garbage collected， assuming no compiler optimizations are done？ （）  public class Q76a9 {   static String f（） {   String a = "hello"；   String b = "bye"； // （0）   String c = b + "!"； // （1）   String d = b；  b = a； // （2）   d = a； // （3）   return c； // （4）  }   public static void main（String args[]） {   String msg = f（）；   System.out.println（msg）； // （5）   }   }
    A

    The line marked （1）.

    B

    The line marked （2）.

    C

    The line marked （3）.

    D

    The line marked （4）.

    E

    The line marked （5）.


    正确答案： D
    解析： 暂无解析

  • 第23题：

    单选题
    The presence of bubbles in a refrigeration system liquid line may （）.
    A

    promote refrigerant dehydration

    B

    be absorbed in the receiver

    C

    cause low condensing pressure

    D

    carry moisture and lead to corrosion


    正确答案： B
    解析： 暂无解析

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