Auxiliary Machinery. Test 13 – Online Maritime Tests

For a Nitrate based cooling water treatment system, what would you consider to be the normal operating limits?

Which of the following functions are chemical treatments for cooling water system designed to do?

None of the functions above.
Minimize corrosion, prevent deposits and scaling, and control of biological growth.
Decrease the amount of cooling water required.
Increase design heat transfer coefficients.

Why is it necessary to have routine testing of the cooling water?

To ensure that the proper residuals of treatment chemicals, as specified, are maintained all time.
t is not necessary.
To trace leakage in the cooling water system.
To detect the presence of contaminants in the water that may be injurious to the cooling system.

Tank (4) in the outlet piping is designed to:

The safety valve on a steam boiler shall:

Open, when pressure in the boiler is in excess of normal working pressure.
Be adjusted by the crew when necessary.
Block the spring and the valve so no steam is escaping in the funnel, if the spring on the valve is not working properly.
Be used to regulate the the steam pressure.

Some 4-stroke engines are equipped with cooled fuel valves. Why is it so important to keep the coolant's temperature correct?

Why are Chromate Based Cooling Water Treatments not allowed when the system is connected to a fresh water generator?

It reacts with metals used in the fresh water generator.
It could poison the fresh water if leakage occurs.
It increases the chloride level.
Chromate Based Cooling Water Treatments are not allowed in any cooling water system.

Why are soluble oils not usually used as cooling water treatments these days?

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