Machinery Malfunctions. Test 1 – Online Maritime Tests

You are experiencing large hunting on the fresh water cooling system. What is the reason?

The fresh water circulating pump is worn out.
The cooling water temperature is too low.
The expansion tank is empty.
You have a cracked liner, or cover.

The bowl in a fuel oil separator opens unintentionally during operation. What is the reason to this?

Strainer in operating water low-pressure side is clogged.
Bowl speed too low.
Any of the others.
Extreme fuel oil characteristics.

The bowl in a fuel oil separator fails to open for sludge discharge. What is the reason to this?

Valves in outlet line are closed.
Any of the others.
Strainer in operating water low-pressure side is clogged.
Strainer in operating water high-pressure side is clogged.

During a routine check of one of the auxiliary engines in an UMS operated engine room, a minor leakage on a high pressure fuel pipe was observed. What would be an appropriate action and/or precaution to be taken? (Assume normal operation; 2 sets operating and 1 set standby)

Change the operation to the third generator set, leaving the original set as stand-by awaiting possibility to repair the failure.
Change operation to the third generator set, preparing the original set for repair of the failure and switching to manual mode until repair is carried out.
Have a motorman on watch for the rest of the night, especially instructed to watch the engine
Any of the mentioned alternatives will meet the requirement.

If the refrigerating compressor runs continually, the cause might be that

Lack of compressor oil
Low-pressure switch is jammed closed
High-pressure switch is jammed open
Thermal bulb is not operating

You have a leak cylinderliner ( poor O -rings on a water cooled compressor). Where is the leaking water most likely to go when the compressor is running?

Into the HP air discharge and mix with the air from the compressor.
Out of the suction filter for the HP cylinder.
Into the crankcase and mix with the lube oil.
Into the LP air discharge and mix with the air from the compressor.

What could be the most probable cause to overheating of bearings?

Any of the others.
Lubricating oil temperature is too low.
Overload of the engine.
Lubricating oil temperature is too high.

Why is it so important to suck back as much freon liquid as possible from the evaporators, before You stop the compressor?

It is not important.
To avoid liquid coming back to the compressor during start up.
To prevent low suction pressure during start up.
To prevent low condensing pressure during start up.

You have installed a new bearing in the main engine. What is the necessary action to take in the running-in period?

No necessary steps to be taken.
Allow for 1 hr. running with appropriate temperature monitoring of the bearing.
Stop after 30 min. running to hand feel the bearing.
Allowance must be made for a running-in period with reduced speed and careful temperature monitoring.

What could be the reason to knocking in the engine?

The injection pumps are working irregularly. Air in the fuel system.
Faulty governor.
The piston clearance is too large. Worn piston or cylinder liners.
Faulty fuel oil supply.

Review Answers