Auxiliary Machinery. Test 6

During standstill liquid may condense in the crankcase or oil seperator. Why is it important to heat up the oil before start?

The compressor will run better.
To avoid the compressor-oil to disapper from the crankcase during starting.
Compressor oil regulating system will operate better.
It should never be done.

During execution of a standard UMS-check, the Engineer on Duty is experiencing a 'low water level' alarm in a cooling water expansion tank. What will be the appropriate immediate action?

The alarm function is blocked for later action
The set point for the water level in the expansion tank is temporarily readjusted for later action.
Correct water level is obtained by refilling the cooling system, and the entire system is checked for leakages
The alarm function is blocked and the engineroom is changed to manual mode.

Which would be the most suitable place to obtain an oil sample for analysis?

From the system pipeline.
From the oil cooler drain.
From the filter drain.
From the lub. oil pump suction line.

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

Interface towards center.
Interface outwards center.
Will have no effect on interface.
Increase of the purification capasity.

What is the meaning of the term purification?

Separation of two insoluble liquids with different densities, and at the same time removing of solids.
Operation as the 2.nd separator in a serial system.
Cleaning a liquid.
Separation of solid contaminants from a liquid.

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

To neutralize the acids occurring in the condensate system.
To prevent sludge depositing in the water.
It is not important.
To prevent oxygen corrosions.

What is meant by a two stage compressor ?

Air from stage one goes through discharge valves in stage one and through suction valves into stage two. In stage two it will be compressed to high pressure air.
The two stage air compressor takes some air from the surroundings to stage one and compress and some air from the surroundings to stage two and compress.
The compressed air goes back from stage two and into stage one to get extra pressure before it goes into the starting air bottles.
Two stage air compressors have the capability to compress air in stage one and dry the air in stage two.

What long term effect will excessively high temperature have on lubricating oil quality?

Cause oxidation which increase viscosity.
Evaporates the oil giving high consumption.
Cause oxidation which reduce viscosity.
The oil flashpoint will be changed.

On a two stage compressor you will find pistons with different diameters (one is bigger than the other).Which one of the following statements is correct ?

The biggest diameter piston is the stage two piston.
A big piston will give less oil content in the air.
A big piston will deliver dryer air into stage one.
The smallest diameter piston is the stage two piston.

Review Answers

Auxiliary Machinery. Test 6

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