Auxiliary Machinery. Test 30 – Online Maritime Tests

1/10

You have checked the oil viscosity in an auxiliary engine with the viscosity test kit. The result shows that the viscosity is high. What will You do?

Increase the cooling water temperature for the oil.
Increase the lub oil pressure.
Clean the system and change the oil.
Decrease the cooling water temperature for the oil.

Why is it so important to keep the lub oil viscosity within safe limits?

To keep the additives in good condition.
To keep the oil protective film between moving metal surfaces.
It is not important
The luboil viscosity has no influence on the oil's lubrication ability.

If diesel fuel contamination occurs in the crankcase oil of an auxiliary engine, the oil viscosity will:

Stay the same.
Increase.
Decrease.
Nothing happens.

What symptom would you think means that the freon filter drier has become blocked?

A large temperature drop across the drier.
Pressure drop before the driver.
Pressure rise before the drier.
A hammering noise from the drier.

Why are crankcase heaters fitted to freon compressors?

To boil off any water.
To prevent freon condensing when the compressor is stopped.
To stop oil from thickening.
None of the mentioned alternatives.

After starting a freon compressor, how long should you wait before opening the oil separator return valve?

After the separator shell has warmed up.
One minute.
I do not know.
Open the valve immediately.

Which of the pressures is the most satisfactory at the suction of an air conditioning freon compressor?

2.0 bar
7.0 bar
4.5 bar
0.5 bar

What can happen with a lub. oil cooled piston if You stop the lub. oil pump immediately after You stop the engine?

The oil flashpoint will be changed.
You save the oil sealings in the piston.
Overheating of the piston, and oil coke deposits in the cooling chambers.
Nothing happens.

Total Base Number ( TBN ) is important as a measure of neutralizing ability against strong Acids. What will You do if this TBN base number is reduced to a low level?

Nothing.
Send one lub oil sample to new analysis.
Purify the oil system.
Renew lub oil in the system.

What could cause engine oil to get a 'Milky' colour?

Water contamination.
Fuel contamination.
Overheating.
The oil is too cold.