Auxiliary Machinery. Test 46 – Online Maritime Tests

How do you carry out skimming operations on the boiler water ?

Blow the water down until steam gushes out.
Four to five repeated blows of about 5 seconds each.
Slowly with feedwater pumps stopped.
When the boiler steam pressure has been reduced to atmospheric pressure.

What is the steering system oil tank within the steering pedestal?

Header tank for the auto pilot control system.
Lubrication tank for the steering gear linkage.
Reservoir for the telemotor system.
Main hydraulic system header tank.

What is significant about an indirect refrigeration system ?

It uses a secondary refrigerant like brine to do the cooling.
It measures temperature in directly.
It has an indirect circulation of cooling medium.
It uses ammonium instead of Freon as cooling gas.

Suppose you find that the safety valve of the Working Air Bottle blows off at a pressure in excess of 8.5 bar. Which of the causes listed below is NOT a possible cause for this lifting of the safety valve ?

Pressure reducing valve from main air bottle defective or stuck.
Insufficient air consumption by the working air consumers.
Setting of cut-in / cut-out pressostat wrongly adjusted or defective.
Compressor unloader is stuck in loading position.

When skimming-off, which valve will you fully open first and close last, whilst operating the other valve throttled ?

The outer valve open first and close last after operation.
The inner valve open first full and close last after operation.
The inner valve open first, the outer valve close last.
The outer valve open first and the inner valve close last.

What kind of temperature control mode is fitted here ?

Controlling inlet by regulating the outlet.
Controlling inlet by regulating the inlet.
Controlling outlet by regulating the outlet.
Controlling outlet by regulating the inlet.

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