Auxiliary Machinery. Test 33

Which of the following effects is likely caused by oil contamination in the boiler water?

It adheres to the boiler tubes and reduce the heat transfer. It combines with solids to produce sticky deposits.
It has no effect.
It increase the boiler tube metal deposition.
It cause pittings on the boiler metal surfaces.

If a shaft of a centrifugal pump shows excessive wear by way of the stuffing box, is this caused by :

Discharge pressure of the pump too high.
Incorrect material used in construction of the shaft.
Excessive heating caused by over tightening of the gland packing.
Wrong direction of rotation.

If a trunk type engine has been running for 24 hour without lub oil separator in operation; when restarting the separator what must be the time between discharges to be set

Depends on the type of oil
5 minutes
Automatically adjusted
15 minutes

Why is temperature control accuracy so important when cleaning lub oil in a conventional separator

Continuous high temperature gives the best separation
Small changes in temperature can cause large movement of the interface
Temperature fluctuations can affect the back pressure
To prevent to many temperature alarms

What would you do if you after starting the separator discovered that the settling tank was full of water

Stop the separator and drain the water from the tank
Increase the flow through the separator
Use full separation capacity
It depends on the installation

What will happen in a purifier bowl if either; oil density, viscosity or flow increase

Loss of water seal
The interface moves outwards
It depends on the change in temperature
The interface moves inwards

Review Answers

Auxiliary Machinery. Test 33

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