海船船员 - 船舶动力装置 - 查题吧

单选题

Before replacing a piston you should check the rings to see that all clearances and gaps are within the permissible （）.

A. deflection
B. discrepancy
C. error
D. tolerance

单选题

When centrifuging heavy fuel oil, an important factor to consider is the （） (1) flow rate (2) viscosity of the fuel oil

A. (1) only is correct
B. (2) only is correct
C. both (1) and (2) are correct
D. neither (1) or (2) are correct

单选题

桨叶上C区位于桨叶表面0.7R以外的部分，其内的缺陷通常允许（）修理，但其工艺应符合规定。

A. 有机胶黏剂
B. 无机胶黏剂
C. 金属扣
D. 焊补

单选题

排气阀阀杆磨损超过标准要求时，可采用（）工艺修复阀杆。也可以采用喷涂或喷焊工艺修复。

A. 镀铬或镀铁
B. 焊接
C. 堆焊
D. 镀铁

单选题

The （） of the lubricant should be sufficient to hold the film together, but it should allow the lubricant to flow easily.

A. specific gravity
B. viscosity
C. acid value
D. calorific value

单选题

The expansion tank for a diesel engine closed cooling system is designed to maintain a constant head on the system and （）.

A. reduce water temperature
B. reduce water turbulence
C. provide an air cushion
D. allow for an increase in water volume as the engine warms u

单选题

In a bypass type lubrication system for a diesel engine, the dirty oil line to the centrifuge should be taken from the （）.

A. lube oil pump suction line
B. lube oil pump discharge line
C. bottom of the lube oil sump
D. outlet from the lube oil header

单选题

艉轴铜套损坏的主要形式有（）。Ⅰ.腐蚀；Ⅱ.裂纹；Ⅲ.过度磨损；Ⅳ.套合松动；Ⅴ.接缝不良。

A. Ⅱ＋Ⅲ
B. Ⅰ＋Ⅱ＋Ⅳ
C. Ⅱ+Ⅲ＋Ⅳ＋Ⅴ
D. Ⅰ＋Ⅲ＋Ⅳ

单选题

赛龙艉轴承材料的缺点是（）。Ⅰ.弹性低；Ⅱ.导热性差；Ⅲ.不耐高温；Ⅳ.不耐磨；Ⅴ.寿命低。

A. Ⅱ＋Ⅲ
B. Ⅰ＋Ⅱ＋Ⅳ＋Ⅴ
C. Ⅲ＋Ⅳ＋Ⅴ
D. Ⅱ＋Ⅲ＋Ⅳ

单选题

The viscosity regulator controls the （） of the fuel oil in order to provide the oil at the correct viscosity for combustion.

A. temperature
B. pumping rate
C. pressure
D. heat

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