海船船员考试

单选题The temperature difference between the inlet and outlet temperature of the lube oil cooler in the lubricating system for the diesel engine is generally between （）.A 8-10℃B 10-12℃C 10-15℃D 10-20℃

题目
单选题
The temperature difference between the inlet and outlet temperature of the lube oil cooler in the lubricating system for the diesel engine is generally between （）.
A

8-10℃

B

10-12℃

C

10-15℃

D

10-20℃

参考答案和解析
正确答案： B
解析： 暂无解析
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相似问题和答案

第1题：

The height of tide is the ______.

A.depth of water at a specific time due to tidal effect

B.difference between the depth of the water and the area's tidal datum

C.difference between the depth of the water and the high water tidal level

D.difference between the depth of the water at high tide and the depth of the water at low tide


正确答案：B

第2题：

What does the command show | compare rollback 1 display?（）

  • A、the difference between the current candidate configuration and the candidate configuration from one commit ago
  • B、the difference between the current active configuration and the current candidate configuration
  • C、the difference between the current active configuration and the active configuration from one commit ago
  • D、the difference between the current candidate configuration and the archived configuration from one commit ago

正确答案:D

第3题：

第二组

The only attention that heat exchanger should require is to ensure that the heat transfer surfaces remain substantially clean and the flow passages generally clear of obstruction. Indication that undue fouling is occurring is given by a progressive increase in the temperature difference between the two fluids, over a period of time, usually accompanied by a noticeable rise in pressure loss at a given flow.

Fouling on the sea-water side is the most usual cause of deterioration in performance. The method of cleaning the sea water-side surfaces depends on the type of heat exchanger. With shell-and-tube heat exchangers, the removal of the header covers or, m the case of the smaller heat exchangers, the headers themselves, will provide access to the tubes. Obstructions, dirt, scale etc., can then be removed, using the tools provided by the heat exchanger manufacturer. Flushing through with fresh water is recommended before a heat exchanger is returned to service. In some applications, such as piston oil cooling, progressive fouling may take place on the outside of the tubes. Most manufactures recommend a chemical flushing pr6cess to remove this in situ~ without dismantling the heat exchanger.

Plate heat exchangers may be cleaned by unclamping the stack of plates and mechanically cleaning the surface of each plate as recommended by the manufacturers. The plate seals may require replacement from time to time and here the manufacturers&39; instructions should be closely followed

By which of the following indication, can we conclude that the lube oil-sea water heat exchanger is unduly fouled?

A.the heat exchanger lube oil inlet temperature lowering

B.the heat exchanger sea-water outlet pressure rise

C.the heat exchanger temperature difference between lube oil and sea water increasing

D.the heat exchanger pressure difference between sea water inlet and outlet decreasing


正确答案：C

第4题：

单选题
As to the low speed diesel engine, if you want to change the coolant flow for a certain cylinder, you can regulate （）.
A

the inlet valve

B

the outlet valve

C

both the inlet valve and the outlet valve

D

the pump inlet valve


正确答案： C
解析： 暂无解析

第5题：

单选题
The purpose of an after-cooler is to（）
A

reduce the turbocharger operating temperature

B

increase the pressure of the inlet air

C

increase the density of the inter air

D

reduce the blower operating temperature


正确答案： D
解析： 暂无解析

第6题：

透平进口温度（turbine inlet temperature（TIT））


正确答案: 代表透平前流量加权平均总 温的通用术语。 因参考截面不同， 有几种不同的定义： 燃烧室出口温度、 喷嘴进口温 度、 透平转子前温度、 ISO 进口温度。 燃烧室出口温度指在燃烧室出口截面被二次空 气稀释后的燃气的流量加权平均总温； 喷嘴进口温度指来自进气缸的冷却空气加到燃 烧室出口的下游后， 进入第一级静叶的高温燃气的流量加权平均总温； 透平转子前温 度指来自第一级喷嘴和透平轮盘的冷却和密封空气加进主流高温燃气后， 第一级动叶 前的高温燃气的流量加权平均总温； ISO 进口温度指按压气机的总空气质量流量与总 燃料质量流量进行的燃烧室总热平衡计算所得出的第一级静叶前的流量加权平均温 度。

第7题：

单选题
As the amount of moisture in the air increases, the difference between the dry bulb and wet bulb temperature will （）.
A

increase

B

decrease

C

remain unchanged

D

be greatest at dew point


正确答案： B
解析： 暂无解析

第8题：

_______can cause oil flow from water outlet of the oil purifier.

A.Oil inlet valve opening too quickly

B.Oil temperature little higher than normal

C.Diameter of gravity disc too small

D.Viscosity of oil little lower than normal


正确答案：A

第9题：

单选题
In a turbocharger, inlet air velocity is increased in the（）.
A

inlet nozzle ring

B

stationary diffuser passages

C

compressor outlet volute

D

rotating impeller vanes


正确答案： D
解析： 暂无解析

第10题：

单选题
The dew point temperature is（）.
A

always higher than the air temperature

B

always lower than the air temperature

C

equal to the difference between the wet and dry bulb temperatures

D

the temperature at which the air is saturated with water vapor


正确答案： D
解析： 暂无解析

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