Auxiliary Machinery. Test 20 – Online Maritime Tests

Which of the below statements characterizes the most significant differences between a water-tube boiler and a fire-tube boiler during operation?

The firetube boiler does not need any non-return valves in the feedwater line circuit.
The firetube boiler has a much better capability to work at higher steam pressure.
Water-tube boilers are more efficient and contains less water. They suffer from major damages when run dry during operation.
The watertube boiler can tolerate a short period of time without any water, when the oilburner is still in action.

A refractory material is one that will retain its solid state even at very high temperatures, and furnace temperatures as high as 1650

To protect the furnace casing from overheating, burning and possible escape of gases into boiler room.
All of the mentioned alternatives.
They act as a heat sink, and ensure more even distribution of heat throughout the furnace.
They are used to protect exposed parts of drum, which otherwise could become overheated.

Why is it important to keep the condense PH- value in correct range?

Which of the following is true when comparing Plate Type with Shell and Tube Type Heat Exchangers?

Why is the maximum pressure in a Plate Heat Exchanger usually limited to about 10 bar?

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

Too low oil flow in the fuel oil separator (ALCAP) oil outlet line is caused by:

If the temperature increase, what will happen with the interface in the bowl?

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