海船船员考试题库2022船舶动力装置题库模拟考试练习题261

1. [单选题]早期故障是在使用开始后，因为（）而产生的故障。Ⅰ.设计与制造缺陷；Ⅱ.磨合不当；Ⅲ.维修不当

A. 仅Ⅰ对
B. Ⅰ+Ⅱ
C. Ⅰ+Ⅲ
D. Ⅰ+Ⅱ+Ⅲ

2. [单选题]在第一次上紧贯穿螺栓时，由于螺栓各承压部分产生塑性变形，使一部分^(part)预紧力丧失，解决的办法是上紧前（）。

A. A．先上紧螺栓，然后再旋松
B. B．将螺栓和承压面彻底清洁干净
C. C．在螺栓和承压面之间涂以适当的润滑剂
D. D．将螺栓和承压面彻底清洁干净和在螺栓和承压面之间涂以适当的润滑剂

3. [单选题]艉轴裂纹主要发生在（）等处。Ⅰ.法兰根部；Ⅱ.工作轴颈；Ⅲ.铜套接缝处轴颈；Ⅳ.键槽根部；Ⅴ.锥部大端截面变化。

A. Ⅱ＋Ⅲ
B. Ⅰ＋Ⅱ＋Ⅳ
C. Ⅲ＋Ⅳ＋Ⅴ
D. Ⅰ＋Ⅲ＋Ⅳ

4. [单选题]中间轴承挡油片对油环有（）作用。Ⅰ.径向止动；Ⅱ.轴向定位

A. 仅Ⅰ对
B. 仅Ⅱ对
C. Ⅰ+Ⅱ
D. Ⅰ或Ⅱ

5. [单选题]舵系固定件的中心线与船舶基线垂直，垂直度偏差不大于（）。

A. 0.5mm/m
B. 1.0mm/m
C. 1.5mm/m
D. 2.0mm/m

6. [单选题]Cylinders of marine diesel engines are normally cooled by （）.

A. sea water
B. fine mineral oil
C. sanitary water
D. fresh water

7. [单选题]For a continuous operation diesel engine, a duplex filter unit would be the best arrangement because （）.

A. changing filter elements would not interrupt engine operation
B. filtering occurs twice in each pass of oil through the system
C. clogging will not occur
D. dropping pressure is half of that through a single filter unit

8. [单选题]Overspeed of the diesel engine driving an electric generator could cause（）.

A. low voltage trip
B. reverse power trip
C. damage to windings
D. excessive exhaust temperature

9. [单选题]The part of a windlass which physically engages the chain during hauling or paying out is the（）.

A. devil's claw
B. bull gear
C. wildcat
D. cat head

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