The sludge tank installed in the diesel engine room is used to collect_______Isludge from the fuel oil settling tanks ad centrifuge IIwater that has been collected in the settling tank

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• They understand the （） of automatic sludge discharging of the purifierBut they are not good in practice.

  A . principle B . principal C . cause D . case

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• To ensure oil purifier working in normal condition,the interval between two sludge discharging should not exceed（） hours.

  A . A.2 B . B.4 C . C.5 D . D.6

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• The （）is used to burn oil sludge.

  A、clarifier B、oily water separator C、incinerator D、distiller

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• Which harmful consequence may be the result of lube oil sludge accumulation? （）

  A . Clogged oil pump suction screens B . Increased oil operating temperatures C . Sticking piston rings D . All of the above

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• （）are used to digest the sewage to produce innocuous sludge in a biological sewage treatment plant.

  A . anaerobic bacteria B . aerobic bacteria C . air bubbles D . disinfection chemical

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• Sludge may form in the crankcase of an air conditioning compressor as a result of （）.

  A . bubbling refrigerant B . overheating and oxidation C . lowered operating temperatures D . reducing the cloud or flash point

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• Each drilling unit equipped with helicopter fuel storage tanks must have the tanks installed as far as practicable from the（）.

  A . landing area and sources of vapor ignition B . main deck C . engine room D . drill floor

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• Which lubricating oil additive is used in diesel engines to reduce the tendency for sludge and varnish to form on the engine parts?（）

  A . Flash point improvers B . Pour point improvers C . Inhibitors D . Foam suppressor

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• Sludge may form in the lubricating oil crankcase of a reciprocating air conditioning compressor as a result of （）.

  A . wax precipitation in the lube oil B . contamination by dust, scale, or moisture C . refrigerant bubbles in the lube oil D . refrigerant reducing the lube oil viscosity

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• If the overflow tank high-level alarm sounds while the fuel oil tanks are being topped off, the engineer should （）.

  A . close the static leg filling valve B . close the overflow tank falling valve C . reduce the fuel oil pumping rate D . stop the fuel oil pumping operatio

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• The sludge tank installed in the diesel engine room is used to collect（） Ⅰ.sludge from the fuel oil settling tanks ad centrifuge Ⅱ.water that has been collected in the settling tank

  A . Ⅰonly B . Ⅱ only C . bothⅠand Ⅱ D . neitherⅠor Ⅱ

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• If you are bunkering and you close off one tank in the line of tanks being filled，the rate of flow to other open tanks on the same line will（）.

  A . increase B . decrease C . stop D . remain constant

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• The oil sludge is burnt in the （）on board I’ll show you the ashes.

  A . boiler B . main engine C . auxiliary engine D . incinerator

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• 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

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• How should cargo tank hatches be protected when the ullage opening is open and the tank NOT gas free?（）.

  A . With gooseneck vents B . With warning signs C . With flame screens D . With pressure-vacuum relief valve

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• When anaerobic bacteria convert the sewage to an inert sludge,（）

  A . no oxygen is needed B . oxygen is necessary C . oxygen is given off D . no gas is produced

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• It is that reduce the BOD by converting the organic content of the sewage to a chemically and organically inert sludge（）

  A . the bacteria B . oxygen C . oxidizing function D . agitation functio

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• Before the sludge in a purifier is ejected,（）

  A、the oil feeding is stopped and replaced by admitting flushing water. B、the flushing water feeding is stopped and replaced by admitting oil. C、the feeding of dirty oil and flushing water is stopped. D、the feeding of dirty oil and flushing water is admitted

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• How should cargo tank hatches be protected when the ullage opening is open and the tank not gas free?（）.

  A . With gooseneck vents B . With warning signs C . With flame screens D . With pressure-vacuum relife valve

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• An alarm device inserted between the deaerating tank and the expansion tank can notify the on-watching crew that （）

  A . the expansion tank is lack of water B . the expansion tank is over flowing C . there is something wrong with the cooling system D . there is something wrong with the engine

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• One of the reasons that cause oil flowed from sludge outlet of a self-cleaning separator 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 oily water is too much

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• The shut off valve at the gasoline tank which can be operated from outside the tank space （）.

  A . controls the amount of gasoline to the engine B . shuts off the gasoline supply at the tank C . is used if the gasoline tank leaks D . All of the above

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• A centrifuge of which the bowl is arranged as the upper and lower parts separate discharges the sludge（）

  A . by opening the separator manually B . by separating the lower part from the upper part automatically C . by separating the upper part from the lower part automatically D . continuously

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• The oil sludge is burnt in the ______onboard.I’ll show you the ashes.

  A.boiler B.main engine C.auxiliary engine D.incinerator

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• Judging from the context, the word "think-tanks"（Para.2) probably means______.A．tanks that

  Judging from the context, the word "think-tanks"(Para.2) probably means______. A．tanks that can think as human beings B．an institute or group organized for interdisciplinary research C．a group of authoritative people D．scholars and professional men

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