相邻轴同轴，其连接法兰处偏中值为（）。

【名词&注释】

船舶动力装置(marine power plant)、有效热效率(effective thermal efficiency)、螺旋桨推力(propeller thrust)

[单选题]相邻轴同轴，其连接法兰处偏中值为（）。

A. A．δ＝0、φ＝0
B. B．δ≠0、φ≠0
C. C．δ＝0、φ≠0
D. D．δ≠0、φ＝0

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学习资料：

[单选题]动力装置有效热效率是指（）。Ⅰ.每小时螺旋桨推力功的相当热量与同一时间内动力装置消耗的燃油完全燃烧所放出的总热量之比；Ⅱ.每小时主机有效功的相当热量与同一时间内动力装置消耗的燃油完全燃烧所发出的总热量之比

A. 仅Ⅰ对
B. 仅Ⅱ对
C. Ⅰ，Ⅱ都对
D. Ⅰ，Ⅱ都不对

[单选题]船舶动力装置的主要耗能设备是（）。Ⅰ.螺旋桨；Ⅱ.主机、发电机和辅助锅炉；Ⅲ.空气压缩机

A. 仅Ⅰ对
B. 仅Ⅱ对
C. Ⅰ+Ⅱ
D. Ⅰ+Ⅲ

[单选题]推进装置的推进效率为推进轴上总有效功率与推进装置消耗的热量之比，因此它与（）无关。

A. 动力装置消耗的能量
B. 动力装置的余热利用
C. 推进装置的燃料消耗
D. A+B

[单选题]For a main diesel engine the lube oil in the bearings is drawn from （）, usually located in the bedplate.

A. a gravity tank
B. a sump
C. a vessel
D. a bottle

[单选题]Keep compartment （） as the gas given off can be dangerous.

A. well ventilated
B. well clean
C. in good order
D. more room

[单选题]The highest pressure in any closed diesel engine freshwater cooling system is at the （）.

A. jacket water outlet
B. expansion tank inlet
C. heat exchanger inlet
D. cooling water pump outlet

[单选题]Fuel oil transfer systems used onboard diesel propelled vessels are required to have （）.

A. two fuel oil transfer pumps provided where one is to be independent of the main engine
B. two fuel oil transfer pumps, with a combined capacity exceeding the maximum consumption of the main engine
C. engine driven transfer pumps and only used in constant speed applications
D. the capacity of the engine driven pump exceed the consumption rate of the engine to which it is attached

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