【名词&注释】
螺旋桨(propeller)、可能性(possibility)、共振频率(resonance frequency)、喷油泵柱塞(injection pump plunger)、不一定(not always)
[单选题]A common trouble with the fuel pump plunger or fuel valve spindle is ().
A. water leakage
B. steam leakage
C. oil leakage
D. air leakage
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学习资料:
[单选题]目前所用燃油的排气露点一般在()℃范围.
A. 80—100
B. 100—120
C. 120—140
D. 140—160
[单选题]相同工作条件下,回油孔式喷油泵柱塞与回油阀式喷油泵柱塞相比,发生穴蚀的可能性()。
A. 两者一样大
B. 前者大
C. 后者大
D. 不一定(not always)
[单选题]带有匙形键槽且根部有适当圆角的单螺旋桨轴或艉轴,其检验间隔期规定为()。
A. 2年
B. 3年
C. 4年
D. 5年
[单选题]消除螺旋桨鸣音的办法是改变随边0.4R以外的()。
A. 桨叶振动频率
B. 涡流引起的振动频率
C. 桨叶固有振动频率
D. 涡流和桨叶的共振频率
[单选题]Fresh water is used for the cooling of cylinder jackets and () of the marine diesel engine.
A. cylinder covers
B. lubricating space
C. crosshead
D. exhaust manifold
[单选题]The period when both inlet valves and exhaust valves are open is referred to as ().
A. valve loop
B. valve uniflow
C. valve overlap
D. valve grinding
[单选题]With the crank in position in the engine, some measurements can be taken by a special bridge gauge and ().
A. a micrometer
B. a bowl
C. a feeler gauge
D. a wrench
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