Machinery Malfunctions. Test 3 – Online Maritime Tests

What do we understand by atomizing when we talk about injectors ?

Extremely tight to open for inspection
Very high fuel oil pressure out of nozzle
The fuel injector is leaking
That no solid beam of fuel shall be present

On the air compressor's crankcase there is a small valve that lets off overpressure. What do we have to do if this valve is letting of pressure and oil moisture ?

Check the clearance in the bearings.
Overhaul the compressor unit.
Increase the flow of cooling water.
Block the valve because it pollutes the engine room (block off the valve).

With full load on the main engine, the turbocharger tachometer reads: Too low RPM. Why?

Turbocharger need to be cleaned/overhauled.
Pick up for tachometer is wrongly adjusted
Damaged connection between pick-up and tachometer unit
Pick up is not connected to turbocharger

The HP discharge valves sometimes get very carbonized in a very short time and continue to do so even when we change the HP valves very freqently. What might be the reason ?

Poor effect from air inlet filter.
Worn scrapper and piston rings.
Too low cooling water temperature.
Water in the lube oil.

We have a problem with vibration in the turbocharger. What might be the cause?

Worn out turbocharger bearings.
The lubricating oil needs to be changed.
The turbine rotor is not balanced.
Dirty air inlet filter.

What will You do if the purifier starts to vibrate, or has heavy vibrations?

Try to increase the flow.
Stop the purifier immediately. Check the bowl for heavy side, deposits, bearings, housing, and the spindle for damage.
Check the vibration alarm.
Try to decrease the flow.

What do we have to do if the lube oil becomes yellow/white (mixed with water) ?

Drain the water.
Change the lube oil.
Fill more lube oil to dilute the water contained in the oil.
Clean the lube oil filter with very short intervals.

With full load on the main engine, the RPM for the turbocharger is too low. What may cause this?

Dirty nozzle ring.
The lubricating oil pump is malfunctioning.
The diffuser ring is damaged.
Exhaust temperatures on the main engine are too high.

In accordance with SOLAS and some international regulations, certain important functions shall always be tested prior to arrival and departure. What functions?

Generator plants and control functions
All mentioned functions
Propulsion machinery and control functions
Steering machinery and control functions

With full load on the main engine, the turbocharger tachometer reads: Too low RPM. Why?

Pick up for tachometer is wrongly adjusted.
Turbocharger need to be cleaned/overhauled.
Damaged connection between pick-up and tachometer unit.
Pick up is not connected to turbocharger.

Review Answers