Auxiliary Machinery. Test 30 – Online Maritime Tests

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

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

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

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

Why are crankcase heaters fitted to freon compressors?

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

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?

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

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

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

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.
Renew lub oil in the system.
Purify the oil system.

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

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

Review Answers