动力装置长期在部分负荷下工作，废热锅炉排烟温度t2过低，对废热

【名词&注释】

螺旋桨(propeller)、动平衡(dynamic balance)、动力装置(power plant)、静平衡(static balance)、中央冷却系统(central cooling system)

[单选题]动力装置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

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学习资料：

[单选题]假设某一中央冷却系统^{(central cooling system)}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

[单选题]螺旋桨经修理后应进行（）和（）检验。

A. 动平衡/螺距
B. 静平衡/运转
C. 动平衡/运转
D. 静平衡/螺距

[单选题]（） the cylinder will contain a great weight of air and will be capable of burning a great quantity of fuel.

A. At the beginning of the compression stroke
B. At the beginning of the suction stroke
C. At the end of the working stroke
D. At the end of the exhaust stroke

[单选题]Which of the following statements is true concerning an oil cooler?（）

A. The oil temperature is less than the cooling water temperature
B. The oil pressure is less than the cooling water pressure
C. The oil pressure is greater than the cooling water pressure
D. The oil flow control valve is always installed in the oil input line

[单选题]The required amount in the change of speed necessary before a governor will make a corrective movement is known as （）.

A. speed droop
B. sensitivity
C. stability
D. promptne

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