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.N

题目

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 stroke

A.①

B.②

C.① and ②

D.Neither ① nor ② is correct

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4.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

更多“A two stroke diesel engine exhaust temperature will be lower than a four stroke diesel eng ”相关问题

  • 第1题：

    If all other conditions such as bore, stroke, speed, and mean effective pressures are equal, a two stroke/cycle diesel engine will develop approximately

    A.the same indicated horsepower as a four-stroke/cycle engine

    B.twice the indicated horsepower as a four-stroke/cycle engine

    C.one half the indicated horsepower as a four-stroke/cycle engine

    D.one power stroke for every two crankshaft revolutions


    正确答案：B

  • 第2题：

    The firemen were unable to control the blaze.

    A:flower
    B:blow
    C:flame
    D:stroke

    答案：C
    解析：
    本题考查的是对名词的认知。这句话的意思是：消防队员无法控制住大火。blaze的意思是“大火”，例如：The fire burned slowly at first , but soon burst into a blaze．这场火起初烧得很慢，但不久就成了熊熊烈火。选项A flower花、最好或最精致的部分。选项B blow打击。选项C flame火舌、火苗、火焰，例如：The whole city was in flames．全城都着火了。选项D stroke一击。blaze和flame意思最接近，所以选C。

  • 第3题：

    柴油机的燃料“Diesel”是以发明人名字命名的


    正确

  • 第4题：

    The upper piston rings m large, slow-speed, two-stroke/cycle diesel engines are most effectively lubricated by oil ____.

    A.fed from mechanical lubricators

    B.thrown off from the main bearings

    C.supplied from wick fed drip lubricators

    D.flow from a centrifugal or banjo oiler


    正确答案：A

  • 第5题：

    5、定压加热循环（Diesel循环）适用于高速柴油机。


    错误

  • 第6题：

    10、柴油机的燃料“Diesel”是以发明人名字命名的


    正确

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