單項選擇題After stopping oily water separator, sea water should be permitted for （） minutes,（）should be closed after stopping pump to reduce oxidation corrosion of inner wall.

A.15；inlet value
B.15；inlet and outlet value
C.30；inlet value
D.30；inlet and outlet value


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1.單項選擇題Before the oily water separator put into operation, it should be （）

A.filled with bilge water
B.filled with oil
C.filled with clean water
D.be emptied

2.單項選擇題The time of discharging oil is short, but oily water separator discharges oil frequentlyThe possible reason is （）

A.the sensor of low oil level is fully covered by sludge
B.the coarse strainer before the pump in suction system is clogged
C.the screw pump is worn seriously and volumetric efficiency is decreased
D.bilge suction value is clogged

3.單項選擇題The pressure difference of the gauge on the oily water separator increases greatly, the reason is（）

A.the filter is clogged
B.bilge suction value is clogged
C.suction value and discharge value of the pump do not open fully
D.screw pump is worn seriously and volumetric efficiency is decreased

4.單項選擇題Oily water separator mis-alarms, the most possible reason is （）

A.separating oil too fast
B.the sensor flushed badly
C.the discharge solenoid value out of order
D.too low heating temperature

5.單項選擇題Because the flow rate of supply water pump is too large, oily water separator does not work wellWhich of the following is not the reason?（）

A.the monitoring equipment is out of order
B.separating effect becomes bad
C.inner wall is contaminated
D.separating effect becomes bad and inner wall is contaminated