【名词&注释】
磨损率(wear rate)、螺旋桨(propeller)、固有频率(natural frequency)、不合格(unqualified)、气缸套(cylinder liner)、不合适(inconcinnity)、中心线(center line)、静平衡(static balance)、实质上(in essence)
[单选题]某螺旋桨半径为2m,质量为800kg,经静平衡(static balance)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
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学习资料:
[单选题]造成产品耗损故障期的主要原因是()。
A. 疲劳、磨损、老化
B. 设计、制造上的缺陷
C. 使用中磨合不合适
D. 操作管理不当
[单选题]柴油机镀铬气缸套正常磨损率应在()mm/kh范围内。
A. 0.1~0.3
B. 0.05~0.1
C. 0.01~0.03
D. 0.005~0.01
[单选题]关于螺旋桨鸣音,下列不正确的说法是()。
A. 在螺旋桨工作时发出的“嗡嗡”的响声
B. 导边涡流激振力引起的桨叶振动
C. 实质上(in essence)是共振
D. 随边0.4R以外部位的涡流引起的振动频率与桨叶固有频率接近所致
[单选题]平台检验舵杆中心线(center line)与舵承孔中心线(center line)同轴度不合格时,应采取()措施修复。
A. 偏镗舵承孔
B. 重新定位舵杆
C. 研磨舵杆与舵叶的配合面
D. 指针法
[单选题]The starting air system usually has () to prevent starting if anything is not in order.
A. drain cocks
B. vent valves
C. counteracts
D. interlock
[单选题]What preventative maintenance should be done frequently to diesel engine starting air receivers?()
A. Drain the accumulated moisture
B. Test the relief valves
C. Watch the temperature to prevent fluctuations in pressure
D. Clean the interior to remove oil and foreign matter
[单选题]Which of the following conditions may need to be reduced when operating a large, low speed, main propulsion, diesel engine at low loads?()
A. Injection pressures
B. Control air supply pressure
C. Cooling water flow through after-coolers
D. Lube oil temperature
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