Water, an inorganic compound, is classed as a nutrient because it is essential to life.

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• Those generally used additives for cooling water are either anti-corrosion oils or inorganic（）.

  A . gases B . paints C . inhibitors D . detergent

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• An oil water monitor is required in order to measure （）.

  A . the oil content in water B . the water content in fuel oil C . the water level in bilge well D . the oil level in bilge well

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• In an oily water separator the oil will travel （） to the oil collecting spaces.

  A . upwards B . downwards C . outwards D . forward

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• Excessive alkalinity of the water in an auxiliary boiler can cause （）.

  A . caustic embrittlement of the boiler metal B . acidic corrosion of the boiler metal C . hard scale deposits on the boiler tubes D . etching of the heat exchange surface

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• The ability of an oil to separate cleanly from an oil and water mixture is referred to as its （）.

  A . precipitation number B . neutralization number C . pour point D . demulsibility

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• In a diesel engine cooling water system, a pH of 60 indicates a/an （）.

  A . slightly acidic condition B . slightly alkaline condition C . overtreatment of water D . neutral condition of water

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• An oil in water monitor is required in order to measure （）.

  A . the oil content in water B . the water content in fuel oil C . the water level in bilge well D . the oil level in bilge well

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• The water in an operating auxiliary boiler should be tested for alkalinity and chloride content each（）.

  A . hour B . day C . week D . month

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• To（）sanitary water from any vessel，an application shall be made to Harbor Authorities for approval.

  A . discharge B . recircle C . load D . take i

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• If a small electric motor is immersed in salt water it should be （） (1) washed in fresh water (2) dried in an oven

  A . (1) only B . (2) only C . both (1) and (2) D . neither (1) or (2)

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• The （）is fitted on an oily water separator.

  A、sliding bowl bottom B、gravity disc C、bowl D、liquid level detector

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• An excessive amount of water is prevented from entering a vessel using a water lubricated stern tube bearing by the use of the （）.

  A . propeller hub B . lignum vitae C . shaft packing D . labyrinth seal

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• Distilled water from an evaporator may be discharged into a potable water tank （）.

  A . through a detachable hose connection B . after passing through an activated charcoal filter C . after chemical analysis shows it is fit for consumption D . through a solenoid operated three-way valve

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• Water accumulation in the cylinder of a secured engine is an indication that the （）

  A . soft water pump was not secured along with the engine B . jacket water thermostat has failed C . cylinder liner may be cracked D . raw water pump is over-speeding just prior to engine shutdow

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• In an auxiliary boiler steam and water system, the highest pressure will be in the （）.

  A . steam stop valve B . dry pipe C . feedwater system D . generating tube

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• If the sump（）were to rise this would indicate water leakage into the oil an d an investigation into the cause must be made.

  A . temperature B . viscosity C . lever D . level

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• Which of the following pumps is most suitable for an oily water separator?（）

  A . reciprocating pump B . vane pump C . mono pump D . axial-flow pum

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• The water in an auxiliary boiler should be tested daily for （）.

  A . dissolved oxygen B . chlorides C . sludge D . dissolved nitroge

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• The water in an auxiliary boiler should be chemically tested daily for alkalinity and（）

  A . soap hardness B . nitrog encontent C . chloride content D . dissolved CO

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• The operating water is supplied under the （）of an oil separator.

  A . sliding bowl bottom B . bowl hood C . bowl D . filter unit

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• About half an hour before the engine is required, cooling water at （） must be circulated.

  A . more than the working temperature B . less than the working temperature C . the working temperature D . the same as the surrounding temperature

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• In the event of a flame failure in an auxiliary water-tube boiler, you must（）

  A . relight the boiler immediately to prevent loss of steam pressure B . relight the fire off the brickwork as the bricks are cherry red C . purge the furnace of any combustible gases before attempting to relight the fire D . speed up the feed pump to prevent dry firing when the burner flame is reestablished

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• The water in an auxiliary boiler should be tested for chloride content to determine （）.

  A . total dissolved solids B . salt contamination C . water hardness D . chlorine contaminatio

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• Ways to reduce energy and water consumption can be understood as an informational process.

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