Engineering, Control Systems. Test 15

Inspection of the crank bearing shows the bearing shell was black and hard with patches of black incrustations which had worn grooves in the journal. What could be the cause?

Dirt in the lubricating oil.
Water in the lubricating oil during service.
Bearing shell service time exceeded.
The wrong casting of bearing shell.

What will happen to the level of the expansion tank if the engine slows down or stops?

Nothing will happen
The level will at first decrease but increases again
The level will increase
The level will decrease

What is the first indication of a broken exhaust valve spring on a Diesel engine?

Blow back through the turbo charger.
High exhaust temperature.
Smoking exhaust.
Low exhaust temperature.

If jacket water alkalinity keeps dropping what could be the cause?

Circulating pump not providing sufficient flow.
Jacket water temperature is too high.
Possible cracked liner/head or leaking head joint.
More chemical additive required.

What does a pressure drop across the scavenge air cooler indicate ?

A reduced cooling water flow.
Fouling of the cooling water system.
Increased engine room temperature.
Fouling of cooler air side.

What is the purpose of the Main Engine Dirty Oil tank?

Collecting tank for all non-reusable oils.
Collecting tank for dirty oil of Main Engine intended for purification.
Collecting tank from Main Engine scavenge drains
Drain tank for the piston rod stuffing boxes.

Review Answers