when
how
where
whether
第1题：
What causes the lube oil pressure of the engine to drop ?
第2题：
控制时间限设定值菜单（）功能是在丙烷机启动过程中旁通润滑油注入温度低信号的时间长度。
第3题：
The pressure differential across a diesel engine lube oil system duplex filter should be checked to ________.
A.determine the need for filter cleaning
B.measure any change in oil viscosity
C.prevent damage to the filter
D.determine the need for batch filtration
第4题：
allow filtration of less viscous oil
decrease the pressure drop across the filter
improve overall filtration
all of the above
第5题：
low lube oil temperature
low lube oil pressure
high exhaust temperature
high cooling water pressure
第6题：
A dirty diesel engine oil filter element can best be detected by ______.
A.visual inspection of the elements
B.the pressure drop across the filter
C.high lube oil sump temperature
D.decrease in oil viscosity from the filter
第7题：
控制时间限设定值菜单（）功能是在丙烷机断电后到丙烷机重新启动之间的时间间隔。
第8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
第9题：
worn cylinder liner
faulty cylinder relief valve
excessive lube oil pressure
excessive scavenge air pressure
第10题：
crankcase
low lube oil temperature
excessive oil consumption
low bearing oil pressure