单选题While _______ an efficiency test on an engine, certain precautions should be observed.A makingB to makeC being made D made

题目
单选题
While _______ an efficiency test on an engine, certain precautions should be observed.
A

making

B

to make

C

being made    

D

made

相似考题

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3.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

4.Much __________ I have traveled, I have never seen anyone to equal her in efficiency.A.although B.as C.while D.if

参考答案和解析
正确答案： C
解析：
在进行发动机的效率测试时要采取一些预防措施。while引导从句时,如主从句的主语一致，且从句谓语又含有be，则从句主语和be可省略。while后可直接跟现在分词、名词、形容词或介词短语。在本题中从句和主句的主语都是人，从句省略了people/workers are。
更多“While _______ an efficiency test on an engine, certain preca”相关问题

  • 第1题：

    单选题
    The mechanical efficiency of an engine is always less than 100% （） losses occurring in the form friction.
    A

    because

    B

    since

    C

    due to

    D

    owing to


    正确答案： D
    解析： 暂无解析

  • 第2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3题：

    单选题
    The diesel engine exhaust gas bypass, as fitted with some waste heat boilers, is installed to （）
    A

    prevent engine back pressure at heavy loads

    B

    increase total engine efficiency at low loads

    C

    prevent boiler corrosion at low engine loads

    D

    improve engine fuel consumption at any load


    正确答案： C
    解析： 暂无解析

  • 第4题：

    单选题
    Diesel engine cylinder head test cocks are used to（）
    A

    check cylinder lubrication prior to starting engine

    B

    connect exhaust gas analyzers to determine engine efficiency

    C

    pressure test cylinder heads to check for leaks

    D

    remove moisture accumulations from cylinder prior to starting


    正确答案： D
    解析： 暂无解析

  • 第5题：

    单选题
    The power developed by a large slow-speed main propulsion diesel engine is dependent upon the （）
    A

    quantity of air it takes in and retains in the cylinders during a given time period

    B

    proportion of trapped air that is utilized in the combustion process

    C

    thermodynamic efficiency of the engine cycle

    D

    all of the above


    正确答案： B
    解析： 暂无解析

  • 第6题：

    单选题
    If the compression ratio is increased on any diesel engine, （）
    A

    the expansion ratio will decrease

    B

    combustion will be slowed down

    C

    thermal efficiency will decrease

    D

    thermal efficiency will increase


    正确答案： B
    解析： 暂无解析

  • 第7题：

    单选题
    Whether a ship is sailing before the wind or sailing in the rough sea, we must reduce the fuel injection of the main engine.For the former one, it aims to prevent the main engine being（）, while for the later one, it aims to prevent the main engine being（）.
    A

    overspeed；overload

    B

    overload；overspeed

    C

    over torque；overspeed

    D

    low mechanical efficiency；overload


    正确答案： A
    解析： 暂无解析

  • 第8题：

    单选题
    In conventional systems, the injection pressure（）, while it’s（）in common rail diesel engines.
    A

    fluctuates with the engine speed to some extent, independent of the engine speed

    B

    keeps constant at all engine speed, dependent on the engine speed to some extent

    C

    keeps constant at all engine speed, independent of the engine speed

    D

    is decided by the engine speed, constant at all engine speed


    正确答案： B
    解析： 暂无解析

  • 第9题：

    单选题
    The ratio of the brake horsepower to the indicate of a diesel engine is its （）
    A

    thermal efficiency

    B

    mechanical efficiency

    C

    brake thermal efficiency

    D

    volumetric efficiency


    正确答案： D
    解析： 暂无解析

  • 第10题：

    单选题
    Compared to a constant pitch propeller, a controllable pitch propeller（）.
    A

    more efficiently uses available engine power

    B

    operates at a lower efficiency at a fixed speed

    C

    produces the same torque at lower engine power

    D

    develops its rated power at a lower speed


    正确答案： B
    解析： 暂无解析

  • 第11题：

    单选题
    Which of the following conditions is realized by the turbo-charging of a previously naturally aspirated diesel engine?（）
    A

    Ignition lag increases

    B

    Lube oil system pressure increases

    C

    Brake specific fuel consumption increased

    D

    Mechanical efficiency increaded


    正确答案： A
    解析： 暂无解析

  • 第12题：

    单选题
    A SECONDARY function of a waste heat boiler is to （）.
    A

    reduce engine exhaust noise

    B

    reduce engine back pressure

    C

    increase engine cycle efficiency

    D

    increase turbocharger efficiency


    正确答案： B
    解析： 暂无解析

  • 第13题：

    单选题
    With VIT the start of injection may be （） as the engine load is reduced within a certain range.
    A

    advanced

    B

    retarded

    C

    relayed

    D

    cut off


    正确答案： D
    解析： 暂无解析

  • 第14题：

    单选题
    Which of the engine components listed increases air charge density and helps to improve engine operating efficiency?（）
    A

    Intake manifold

    B

    Water-cooled exhaust system

    C

    After-cooler

    D

    Exhaust diffuser


    正确答案： A
    解析： 暂无解析

  • 第15题：

    单选题
    One hour before sailing, the duty engineer and officer should check （）
    A

    tachometer and engine telegraph

    B

    oil and water reserves

    C

    clock and engine telegraph and test the rudder

    D

    crews


    正确答案： B
    解析： 暂无解析

  • 第16题：

    单选题
    Charging-air pressure increases if there is incorrect combustion and drop in the （） of the diesel engine.
    A

    machine efficiency

    B

    machinery efficiency

    C

    mechanical efficiency

    D

    mechanics efficiency


    正确答案： A
    解析： 暂无解析

  • 第17题：

    单选题
    A test in industrial psychology is used to find out _____.
    A

    a worker's achievements

    B

    a worker's potential for a certain job

    C

    a worker's psychological problem

    D

    a worker's motivation for a certain job


    正确答案： C
    解析：

  • 第18题：

    问答题
    George took a test of a certain number of questions, each question having the same value. He answered 10 questions incorrectly. This resulted in an accuracy score of 60%. How many questions were in the test?

    正确答案： 25
    解析：
    这是一道计算题，George的正确率是60%，错误率就是40%，我们用10除以40%，就可以得到总题数。

  • 第19题：

    单选题
    While _______ an efficiency test on an engine, certain precautions should be observed.
    A

    making

    B

    to make

    C

    being made    

    D

    made


    正确答案： B
    解析：
    在进行发动机的效率测试时要采取一些预防措施。while引导从句时,如主从句的主语一致，且从句谓语又含有be，则从句主语和be可省略。while后可直接跟现在分词、名词、形容词或介词短语。在本题中从句和主句的主语都是人，从句省略了people/workers are。

  • 第20题：

    单选题
    While _____ an efficiency test on an engine, certain precautions should be observed.
    A

    making

    B

    to make

    C

    being made

    D

    made


    正确答案： B
    解析：
    句意：在进行发动机的效率测试时要采取一些预防措施。while引导从句时,如主从句的主语一致，且从句谓语又含有be，则从句主语和be可省略。while后可直接跟现在分词、名词、形容词或介词短语。在本题中从句和主句的主语都是人，从句省略了people/workers are。

  • 第21题：

    单选题
    While engine is in operation the piston moves up and down, thus causing the rotation of the （）.
    A

    crankcase

    B

    slipper

    C

    cam housing

    D

    crankshaft


    正确答案： C
    解析： 暂无解析

  • 第22题：

    单选题
    The PRIMARY function of a waste heat boiler is to （）.
    A

    reduce engine exhaust noise

    B

    reduce engine back pressure

    C

    recover heat which otherwise would be lost

    D

    increase turbocharger efficiency


    正确答案： B
    解析： 暂无解析

  • 第23题：

    单选题
    Which of the factors listed has the greatest effect on the mechanical efficiency of a diesel engine?（）
    A

    temperature of the intake air

    B

    friction within the engine

    C

    mechanical condition of the supercharger

    D

    mechanical condition of the turbocharger


    正确答案： C
    解析： 暂无解析

  • 第24题：

    单选题
    When ship navigating in rough sea, the correct operation is （）
    A

    navigating with a low diesel engine speed

    B

    navigating with a stable diesel engine speed

    C

    increasing the efficiency of propeller

    D

    increasing fuel injection


    正确答案： D
    解析： 暂无解析

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