【名词&注释】
柴油机(diesel engine)、压缩空气(compressed air)、液压油(hydraulic oil)、不平衡(unbalance)、动力装置(power plant)
[单选题]活塞运动部件与固定件相互位置校中是为了()。
A. 保证校中精度
B. 提高校中精度
C. 实现校中技术要求
D. 柴油机可靠运转
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学习资料:
[单选题]动力装置(power plant)长期在部分负荷下工作,废热锅炉排烟温度t2过低,对废热利用设备的维护管理是()。
A. 有利的
B. 合理的
C. 必须的
D. 不利的
[单选题]在更换液压拉伸器的密封环时,应尽量使用()将活塞和油缸分离。
A. 压缩空气通过泄放旋塞孔
B. 油泵泵入液压油
C. 橇棒
D. 木捶敲击
[单选题]平板形舵可作成()。Ⅰ.平衡舵;Ⅱ.穿心舵轴平衡舵;Ⅲ.半平衡舵;Ⅳ.不平衡舵;Ⅴ.完全平衡舵。
A. Ⅰ+Ⅱ
B. Ⅰ+Ⅳ+Ⅴ
C. Ⅲ+Ⅳ+Ⅴ
D. Ⅰ+Ⅲ+Ⅳ
[单选题]Among the rings of a piston the () one is subjected to the greatest load and temperature.
A. bottom
B. middle
C. top
D. none of the above
[单选题]The position of the piston parts in relation to each other is secured by means of () and a dowel pin in the crown.
A. bosses
B. through bolts
C. machine-turned recesses
D. long stud
[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
[单选题]In a simple mechanical governor, the ().
A. centrifugal force rotates the ball-head
B. flyweight centrifugal force is balanced by spring force
C. flyweight centrifugal force is balanced by hydraulic pressure
D. speeder spring alone actuates the fuel control rod
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