Before replacing a piston you should check the rings to see

【名词&注释】

热喷涂(thermal spraying)、总面积(total area)

[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

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学习资料：

[单选题]艉轴管装置的主要作用是（）。Ⅰ.支承，Ⅱ.减磨，Ⅲ.密封，Ⅳ.散热，Ⅴ.构成轴系。

A. Ⅱ＋Ⅲ
B. Ⅰ＋Ⅱ＋Ⅳ
C. Ⅲ＋Ⅳ＋Ⅴ
D. Ⅰ＋Ⅲ

[单选题]尾轴锥形轴段出现裂纹的主要原因是（）。Ⅰ.疲劳；Ⅱ.振动；Ⅲ.撞击

A. Ⅰ+Ⅱ
B. Ⅰ+Ⅲ
C. Ⅱ+Ⅲ
D. Ⅰ+Ⅱ+Ⅲ

[单选题]舵杆轴颈表面腐蚀面积＞25%总面积时，应进行（）。

A. 堆焊后光车
B. 光车后镀铬
C. 热喷涂后光车
D. 光车后镀铁

[单选题]Before "stand-by" is rung on the engine telegraph, it is usual to give the main engine （） ahead and astern.

A. a brief trial with turning gear
B. a brief trial on power
C. a long trial by steering gear
D. one minutes trial with windla

[单选题]The cooling water jacket is common to all the cylinders but there are often （） to ensure that each cylinder receives the right amount and flow of water.

A. dividing walls
B. divided walls
C. dividing liners
D. divided jacket

[单选题]The four strokes are called suction, compression, expansion and exhaust, but only （） stroke provides the power to drive the ship.

A. suction
B. compression
C. expansion
D. exhaust

[单选题]What is the operating principal of a flash type evaporator?（）

A. Sea water is heated to boiling temperature under a vacuum
B. Sea water is passed over heated plates in a thin film
C. Heated sea water is injected into a vacuum chamber
D. Sea water is forced through a heated eductor

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