【名词&注释】
可靠性(reliability)、轴承座(bearing chock)、中央冷却系统(central cooling system)
[单选题]假设某一中央冷却系统中设有三台循环水泵,船舶航行在温带水域若只要两台水泵正常工作就能满足冷却需要,则三台水泵从可靠性角度看就成为()。Ⅰ.并联系统;Ⅱ.串联系统;;Ⅲ.表决系统
A. 仅Ⅰ对
B. 仅Ⅱ对
C. 仅Ⅲ对
D. Ⅰ,Ⅱ都对
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学习资料:
[单选题]在水平平面内,当曲柄的两个主轴承位置偏左,曲轴轴线呈左弧线弯曲(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]对使用液压撑杆螺栓的正置式主轴承,因其一端顶在轴承盖上,另一端顶在()上,所以在上紧贯穿螺栓之前,必须先()全部撑杆螺栓。
A. 轴承座/上紧
B. 机架/松开
C. 轴承座/松开
D. 机架/上紧
[单选题]Engine fuel pump index is ().
A. the viscosity index
B. the fuel oil contents
C. the starting speed
D. the reading at the rack
[单选题]Excessive clearances in the main or crank-pin bearings will sometimes be indicated by () before any bearing knock is heard.
A. loss of flow in the fuel system
B. loss of pressure in the air system
C. loss of flow in the lubricating system
D. loss of pressure in the lubricating system
[单选题]Lube oil pumps taking suction from the sump of most small marine engines are usually ().
A. of the diaphragm type
B. of the centrifugal type
C. of the positive displacement type
D. independently driven by electric motor
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