【名词&注释】
热平衡(heat balance)、液压油(hydraulic oil)、故障率(failure rate)、轴承座(bearing chock)、船舶动力装置(marine power plant)、动力装置设计(propulsion plants design)
[单选题]对耗损故障期的错误表述是()。
A. 耗损故障是由于疲劳、磨损、腐蚀和老化等原因产生的
B. 耗损故障期的故障率是时间t的递减函数
C. 进入耗损故障期的产品应进行修理或报废
D. 在耗损故障期故障率急剧增高
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学习资料:
[单选题]海船燃气动力装置中效率最高的是()。
A. 低速柴油机
B. 中速柴油机
C. 高速柴油机
D. 燃气轮机
[单选题]在进行船舶动力装置(marine power plant)设计时,为了找出合理利用余热的途径,必须考虑()。Ⅰ.整个船舶的能量平衡;Ⅱ.各个耗能设备的热平衡
A. 仅Ⅰ对
B. 仅Ⅱ对
C. Ⅰ十Ⅱ
D. Ⅰ或Ⅱ对
[单选题]航行中,主柴油机发生拉缸事故,依据拉缸程度、海况等情况分别可采取()的应急措施。Ⅰ.继续航行;Ⅱ.停车;Ⅲ.吊缸检修;Ⅳ.简单的减缸航行;Ⅴ.完全减缸航行。
A. Ⅰ+Ⅱ+Ⅳ+Ⅴ
B. Ⅰ+Ⅳ+Ⅴ
C. Ⅱ+Ⅲ+Ⅳ+Ⅴ
D. Ⅳ+Ⅴ
[单选题]某些新型大型低速柴油机的气缸盖上,设有用来拆卸缸盖螺帽的液压装置(液压环)和配备了专用环形六角扳手,该扳手的作用是()。
A. 通入液压油时,用来松紧缸盖螺帽
B. 液压装置失效时,用来松开缸盖螺帽
C. 液压装置失效时,用来上紧缸盖螺帽
D. 通入液压油时,用来松紧缸盖螺帽和液压装置失效时,用来上紧缸盖螺帽
[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]A distance piece, with ground faces, known as a compression plate, may be interposed between the rod and the beating housing, its thickness being chosen to ensure the correct ().
A. compression pressure
B. compression test
C. compression ratio
D. compression clearance
[单选题]Mist detectors used on large low-speed main propulsion diesel engines monitor and check for the presence of ().
A. fuel oil vapor at the sludge tank vent
B. unburned fuel vapors in the scavenge air receiver
C. lube oil vapors in the crank case
D. lube oil vapors in the engine room
[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
[单选题]Lube oil filters remove contaminants more efficiently if the oil being filtered is ().
A. under high pressure
B. under low pressure
C. heated to reduce viscosity
D. cooled to increase viscosity
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