【名词&注释】
螺旋桨(propeller)、续航力(endurance)、船舶动力装置(marine power plant)、静平衡(static balance)、可靠性要求(reliability requirement)、警告牌(warning board)
[单选题]关于废气锅炉烟垢着火温度()。Ⅰ.烟垢潜在着火温度一般为300—400℃;Ⅱ.存在未燃烧的燃油时烟垢着火温度约为150℃;Ⅲ.极端情况下甚至低到120℃仍可发生烟垢着火
A. Ⅰ+Ⅱ
B. Ⅰ+Ⅲ
C. Ⅱ+Ⅲ
D. Ⅰ+Ⅱ+Ⅲ
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学习资料:
[单选题]减少船舶动力装置的重量和尺度,必须满足()。
A. 经济性要求
B. 可靠性要求(reliability requirement)
C. 续航力要求
D. A+B
[单选题]废气锅炉出口排烟温度t2不应低于露点,为了最大限度利用排气余热,在标定工况下,t2=露点+△t(℃),式中△t不应小于()℃.
A. 25
B. 30
C. 40
D. 50
[单选题]吊缸主机检修时,应当(),以防止伤人和损坏机件。
A. 合上盘车机
B. 脱开盘车机
C. 在主机操纵部位悬挂警告牌(warning board)
D. 合上盘车机并在主机操纵部位悬挂警告牌(warning board)
[单选题]油润滑艉轴承首端密封的作用是()。
A. 防止海水漏入机舱
B. 防止滑油漏入机舱
C. 防止污物进入艉轴承
D. 保护艉轴承
[单选题]某螺旋桨半径为2m,质量为800kg,经静平衡实验测附加重物的质量为2kg,其中系数K为1.5,请问该螺旋桨允许的不平衡质量为()。
A. 0.4kg
B. 0.8kg
C. 0.6kg
D. 1kg
[单选题]舵承孔同轴度偏差过大时,可采取()措施。
A. 更换舵承衬套
B. 偏镗舵承孔衬套
C. 衬套需可靠定位以防转动
D. 镗削全部舵承衬套
[单选题]General, the best way for replacement of lamp is ().
A. after the point is reached at which the failures begin to increase rapidly
B. before the point is reached at which the failures begin to increase rapidly
C. before the point is reached at which the failures begin to increase slowly
D. after the point is reached at which the failures begin to increase slowly
[单选题]To minimize corrosion, fuel oil strainer disks, spacers and scraper blades are made of ().
A. brass
B. copper
C. iron
D. monel metal or stainless steel
[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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