Main Propulsion, Turbines, Boilers. Test 3

What may be the cause of black smoke from the funnel?

The fuel oil is of inferior quality.
Incomplete combustion owing to wrong mixture of air and oil.
An electrically operated turning machine is used during repairs while the engine is running.
The fuel oil has not been adequately heated.

What is the difference between a 2 stroke and a 4 stroke diesel engine ?

A 4 stroke engine does not need explosion safety- valves on the crankcase door.
The camshaft rotates with half the RPM of the crankshaft on a 4 stroke engine.
A 4 stroke engine have scavenging portholes in the bottom of the cylinder liner.
The 4 stroke engine has ignition every time the piston reach the top position.

You are having a blow-by on the main engine, but due to the circumstances, it is impossible to stop and do a piston overhaul. What is the correct action to take?

No action necessary.
Reduce speed.
Reduce speed temporarily and increase cylinder oil consumption.
Increase cylinder oil consumption.

What would be the most probable cause of too high exhaust gas temperatures in all the cylinders?

The chain is slack, dirty turbocharger or glogged turbocharger filter.
The valve clearances are too small.
Water in the fuel oil system.
Air in the fuel oil system.

What is the correct operation for Slow-turning?

Putting in order after 1 hour running
Putting in order after 10 minutes running
To be effected if the engine has been stopped for more than 30 minutes
Putting in auto order when on stand-by, to be effected every 10 - 15 minutes

Your vessel is entering a tropical area and high humidity is expected. To avoid condensation in the main engine's air cooler, it is recommended to:

Reduce speed.
Operate the engine with slightly open drain cocks, scavenging to get rid of the water
Decrease the air temperature so proper draining can be achieved from the air cooler
Increase scavenging air temperature to above dew point

The main task of the HP valve in the HP fuel oil pump is:

to stop fuel oil from getting out to the HP fuelpipes between the pumpstrokes.
to adjust the ignition timing.
to stop fuel oil from getting back from the HP fuelpipes between the pump strokes.
to adjust the amount of fuel injected into the engine.

When an engine is working normally, the lubricating oil return temperatures are moderate and the running temperatures of the moving parts are also moderate. Lubricating oil is not a volatile liquid and the temperature inside the crankcase is insufficiently high to cause concentration of vapor. What would be the flash point of the lubricating oil?

Above 100 deg C
Above 150 deg C
Above 200 deg C
Above 250 deg C

You notice the sump level in an engine has increased and no new oil has been added. What action would you take?

Leave it the same.
Reduced the load, and look after fuel or water leak.
Stop the engine and look for a fuel or water leak.
Drain some oil from the engine.

Review Answers