【名词&注释】
柴油机(diesel engine)、共振频率(resonance frequency)、螺旋桨鸣音
[单选题]根据46艘柴油机船的调查统计,航行总时间达111万h,此期间主机停车和减速故障共1200次,如通过某运河的时间为10h,则过某运河的可靠度为()。
A. 0.9892
B. 090
C. 0.852
D. 0.9955
查看答案&解析
查看所有试题
学习资料:
[单选题]柴油机横向校中是指在()方向上活塞运动部件与固定件有准确的相对位置。
A. 柴油机左、右
B. 船舶左、右
C. 活塞左、右
D. 曲轴左、右
[单选题]在水平平面内,当曲柄的两个主轴承位置偏右,曲轴轴线呈右弧线弯曲(即呈“)”形)时,该曲柄的臂距差Δ-为()值。
A. 正
B. 负
C. 零
D. 正或零
[单选题]白合金艉轴承的极限轴承间隙近似等于()倍的安装间隙。
A. 2
B. 3
C. 4
D. 5
[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 lower end of each piston rod is reduced in diameter to fit a bore in (), this being secured to the piston rod by a nut.
A. the crank-web
B. the connecting rod
C. the main bearing
D. the cross-head
[单选题]What is the effect of heated intake air on a diesel engine? ()
A. Increases efficiency
B. Increases engine horsepower
C. Increases engine life
D. Reduces engine horsepower
本文链接:https://www.51bdks.net/show/rvv6k7.html