Oil inlet valve opening too quickly
Oil temperature too high
Diameter of gravity disc too small
Viscosity of oil too low
第1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
第2题：
Overflow valve
Reducing valve
Balancing valve
Reducing valve or balancing valve
第3题：
One of the reasons that causes oil flowed from sludge outlet of a self-cleaning purifier is
A.seal water supply be cut off
B.make-up water supply be cut off
C.oil outlet valve closed or not open sufficiently
D.the flow rate of oil is too much
第4题：
High lube oil pressure
High jacket water pressure
High jacket water temperature
Low jacket water pressure
第5题：
Visual inspection of the element
the pressure drop cross the filter
high fuel oil tank temperature
increase flow rate from the filter
第6题：
Before loading bulk grain, bilge wells must be covered to ______.
A.add strength to the bilge well strainer
B.permit rapid flow of water to the bilge wells
C.prevent cargo sifting into the bilge wells
D.prevent oil, water, or other liquid from reaching the cargo
第7题：
a dirty lube oil strainer
internal water leaks
an oil suction line restriction
excessive wears of the cooling water pump
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：
low water level
high water level
excessively high fuel pressure
low oil temperature
第10题：
add strength to the bilge well strainer
permit rapid flow of water to the bilge wells
prevent cargo sifting into the bilge wells
prevent oil，water，or other liquid from reaching the cargo