Auxiliary Machinery. Test 66 – Online Maritime Tests

If the oil flows out on the heavy liquid (water) side of a purifier, the most likely reason is _____

that the gravity disc inside diameter is too big, or that the oil temperature has dropped, increasing the density of the oil.
that the amount of closing water for the bowl is insufficient.
that the revolution of the bowl has slowed and the electric motor is in overload.
that the operating water for the bowl has been turned off or the containing tank is empty.

When abnormal vibrations or sounds are noticed from an oil purifier, the most likely cause is _____

that the oil seal for the horizontal shaft is worn or damaged.
that the gravity disc is the wrong size and/or oil inlet temperature is too low.
that the water outlet of the bowl is blocked causing imbalance in the purifier bowl.
that the bowl has failed causing contact with non-rotating parts or defects in horizontal or vertical shaft parts have occurred.

The usual mode of series operation of two heavy fuel oil purifiers refers to _____

two identical machines being operated in series, the first as purifier, the second in line as clarifier with same throughput.
two identical machines being put from settling tank to 1st purifier, hence to second purifier, at half the throughput each purifier.
two identical purifiers being used for heavy fuel oil as well as for diesel oil, by changing line system and gravity discs.
two identical machines being put separately from settling tank to daily tank at half the feed rate through each purifier.

If there is a very sudden and large increase in steam consumption, how will the boiler water level behave ?

On what part of the air compressor does the unloader act and in what way?

Oil purifiers can be used for purifying as well as for clarifying operations. The clarifying operation is referred to as _____

the single phase liquid-liquid operation (water from oil).
The 2 phase liquid-solid operation, separating dirt from oil.
The 2 phase solid-liquid operation, separating dirt from water and oil.
the 3 phase liquid-liquid-solid operation, separating light from heavy liquids, as well as solids from light as from heavy liquids.

What is the function of the relief valves fitted between main hydraulic cylinders?

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