Auxiliary Machinery. Test 13 – Online Maritime Tests

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

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

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

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

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

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

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

The safety valve on a steam boiler shall:

Open, when pressure in the boiler is in excess of normal working pressure.
Be used to regulate the the steam 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.

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

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

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

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