1) 2) 3) 4)
The cooling water space. The sacrificial anode. The tubeplate. The tubestack. 4 Engine Category Answer :
Q:
What is Part No 7 ? 1) 2) 3) 4)The sediment tapping valve. The cooling water drain valve. The high pressure Lub oil inlet. The water temperature gauge.
2 Engine Category
Answer :
Q:
As a rule of thumb, the time interval for automatic desludging of lubricating oil purifiers fitted on sumps of trunk-type engines should be set at ...hours. 1) 2) 3) 4) 1 to 2 2 to 4 4 to 6 6 to 8 1 Engine Category Answer :
Q:
In diesel engines, cylinder lubrication has the primary function of ... .
1) 2) 3) 4)
forming a film between liner and rings, acting as a sealing barrier to prevent the escape of combustion gases and reducing friction ensuring that cylinder liner and piston are well oiled so that they will not overheat.
cooling the piston which would otherwise overheat and ensure that the carbon between the piston rings is cleared away.
flushing the carbon residue from the piston skirt and wash it down
into the scavenge space. 1
Engine Category
Q:
A diesel engine block is made of ... and does not permit welding. 1) 2) 3) 4) stainless steel. mild steel. cast iron. tempered steel. 3 Engine Category Answer :
Q:
Broken piston rings on diesel engines, if not visibly broken, can be identified because ...
1) 2) 3) 4)
the ring or groove clearances have worn in excess.
the piston crowns have developed hot spots and burning marks over the surface.
the piston skirts show marks of burned oil.
they are darker in colour and lack elasticity when pushed towards
the inside of their grooves. 4
Engine Category
Answer :
Q:
Fire in the scavenging chambers of diesel engines may be caused by combustion of carbon deposits accumulated over an extended period due to ...
1) 2) 3) 4)
excessive lubrication of the cylinder liner.
blocked stuffing box drain piping or worn stuffing box wear rings or sealing rings.
slow combustion caused by poor injection.
wrong grade fuel oils used for extended period in the engine.
3 Engine Category
Answer :
Q:
When checking the tightness of nuts and bolts during a diesel engine crankcase and hold-down bolt inspection, the quickest and most effective method is ...
1) 2) 3) 4)
checking bold clearances with feeler gauges. tapping the nuts and bolts with a hammer.
checking the stress on the locking plates or split pins. checking the tightness using torque spanners.
2 Engine Category
Q:
Diesel Engine crankcase oil mist detectors are designed to analyse ... .
1) 2) 3) 4)
the concentration of oil vapours in the crankcase. the temperature of the bearings in the crankcase. the temperature of the oil in the crankcase. fire risk in the crankcase.
1 Engine Category
Answer :
Q:
The direction of flow of cooling water in an engine is always ... .
1) 2) 3) 4)
from top to bottom. from left to right. from bottom to top. from right to left.
3 Engine Category
Answer :
Q:
On all ships it is possible to cool the propulsion machinery directly by the ... .
1) 2) 3) 4)
main fire pump. ballast pump.
after peak cooling water.
salt water pump (main sea water pump).
4 Engine Category
Answer :
Q:
Experience and feedback shows that excessive oil losses in an engine installation are most frequently caused by ... .
1) 2) 3) 4)
losses in oil coolers.
malfunctioning of the valves during the cleaning of the filters of the lubricating oil system.
excessive oil in the cylinder being burned during combustion (defective piston/scraper rings).
any of the other options.
4 Engine Category
Q:
Which part of a diesel engine keeps the engine speed constant regardless of the engine load ?
1) 2) 3) 4)
The flywheel.
The manoeuvring controller. The vibration damper. The governor.
4 Engine Category
Answer :
Q:
Automatic shutdown of the main diesel engine always acts on the ... 1) 2) 3) 4) governor. control air supply. fuel supply. manoeuvring disc. 3 Engine Category Answer :
Q:
Putting additives into diesel engine cooling water is primarily designed to prevent .... 1) 2) 3) 4) overheating. freezing. leakages. scaling. 4 Engine Category Answer :
Q:
If the main engine jacket cooling water expansion tank level drops rapidly, what could this indicate?
1) 2) 3) 4)
There is a leak in the jacket cooling water cooler. There is an internal leak in the engine.
There is a leakage in external piping. Any of these.
4 Engine Category
Q:
How is the exhaust gas turbocharger cooled in relation to the engine?
1) 2) 3) 4)
In series with the cylinders. In line with the cylinders. In parallel with the cylinders. In tandem with the cylinders.
3 Engine Category
Answer :
Q:
Why is it important to slow down the main engine RPM while water washing the turbocharger ?
1) 2) 3) 4)
To protect the blower side. To protect the bearings.
To protect rotor blades from damage. To protect the exhaust gas economizer.
3 Engine Category
Answer :
Q:
Your vessel is entering a tropical area and high humidity is expected. What should you do to avoid condensation in the main engine's air cooler ?
1) 2) 3) 4)
Operate the engine with slightly open drain cocks, scavenging to get rid of water.
Decrease the air temperature so proper draining can be achieved from the air cooler.
Increase scavenging air temperature to above dew point. Reduce speed.
1 Engine Category
Answer :
Q:
When all preparations have been made to ensure that the main engine is operational prior to departure, what will be the final test to be carried out ?
1) 2) 3) 4)
Put out the turning gear and turn the lubricators.
Blow indicator cocks, test reversing of engine, short firing kick. Close safety valves, blow indicator cocks, fill air bottles. Open air to engine, drain air bottles, blow indicator cocks.
2 Engine Category
Q:
To avoid the possibility of a scavenge fire what important check is to be carried out every watch and more frequently if a damaged piston ring is suspected?
1) 2) 3) 4)
The cylinder lubrication. The exhaust gas temperature. The scavenge drain flow through. Overhear the cylinder for noise.
3 Engine Category
Answer :
Q:
The water cooling space on the turbocharger is damaged and you have no spares. The cooling water must be closed. What steps would you take to ensure least possible damage?
1) 2) 3) 4)
Run the engine at lower speed with the turbine drains open. Open turbine drains and tell the duty engineer to pay special attention for abnormalities.
Remove rotor assembly and fit the sealing plate. Shut off cooling water and run at reduced rpm.
3 Engine Category
Answer :
Q:
Paint spraying has been carried out in the engine room while the engine was running and the turbocharger was not protected. This could cause which of the following ?
1) 2) 3) 4)
Higher than normal scavenging air pressure. Higher than normal revolutions on the turbocharger. Lower than normal revolutions on the turbocharger. Higher then normal exhaust gas temperatures.
4 Engine Category
Answer :
Q:
After how many hours would you consider changing the turbocharger bearings, even though all appears to be normal ?
1) 2) 3) 4) 4000 hours. 12000 hours. 25000 hours. 30000 hours. 2 Engine Category Answer :
Q:
The turbocharger (constant pressure) is making "whoofing" noises. What might be the cause ?
1) 2) 3) 4)
A strong counter current. Heavy seas from astern. A faulty turbocharger bearing. One or more leaking exhaust valves.
2 Engine Category
Answer :
Q:
The revolutions on the turbocharger have increased during the night with an unmanned engine. This could be caused by ... .
1) 2) 3) 4)
the viscosity of the fuel being high. the wind and current being favourable. the wind and current holding the vessel back. poor combustion due to malfunction of fuel valves.
3 Engine Category
Answer :
Q:
Which of these could cause a problem with surging in the turbocharger ?
1) 2) 3) 4)
Dirty scavenging air cooler on the air side. Worn bearings on the turbocharger. Lubrication oil pump is malfunctioning. Dirty rotor blades and nozzle ring.
1 Engine Category
Answer :
Q:
Which of the following is the distance between the piston and the cylinder head when the piston is at bottom dead center ?
1) 2) 3) 4) Combustion clearance. Cylinder clearance. Compression clearance. Any of these. 2 Engine Category Answer :
Q:
With full load on the main engine, the RPM of the turbocharger is too low. What may be the cause ?
1) 2) 3) 4)
Dirty nozzle ring.
The lubricating oil pump is malfunctioning. The diffuser ring is damaged.
Exhaust temperatures on the main engine are too high.
3 Engine Category
Answer :
Q:
The lubricating oil on the exhaust side of the turbine blower gets dirty after only a few hours in service. What can the reason be ?
1) 2) 3) 4)
The wrong type of oil used. Cooling water leak into oil space..
Labrynth seal leaking exhaust gas into the oil. Damaged/worn turbine side bearing.
3 Engine Category
Answer :
Q:
After water washing the turbocharger exhaust side, the blower starts to vibrate. What has happened ?
1) 2) 3) 4)
The foundation bolts for the blower unit are loose.
The rotor blades are damaged or the blades are not properly cleaned.
The inlet filer is partly clogged.
The water drain for washing system is clogged.
2 Engine Category
Answer :
Q:
The charge air pressure is low, what is the most likely cause ?
1) 2) 3) 4)
Dirty scavenge duct. Dirty air inlet filter. Leaking air inlet valves..
Cooling water temperature is too high.
2 Engine Category
Q:
If you want to obtain a higher spray-off pressure on the injector, what should you do ?
1) 2) 3) 4)
Tension the injector spring more. Tension the fuel pump spring more. Adjust the fuel pump cam to advance. Adjust the fuel pump cam to retard.
1 Engine Category
Answer :
Q:
If you are going to enter the engine's crankcase, how should you secure the engine after you have closed the main starting air valve?
1) 2) 3) 4)
Close absolutely all valves on the starting air bottle. Engage the turning gear on the engine.
Close all starting air valves and post a warning notice on the start air bottle.
Keep a man posted in the control room to watch that nobody tries
to start the engine. 2
Engine Category
Answer :
Q:
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?
1) 2) 3) 4)
Water in the lubricating oil during service. Dirt in the lubricating oil.
The wrong casting of bearing shell. Bearing shell service time exceeded.
1 Engine Category
Answer :
Q:
When carrying out piston overhaul, why it is important to clean the ring grooves properly?
1) 2) 3) 4)
To make the ring fit in the groove.
All rings must be changed to make a perfect sealing. So that the piston rings can move freely in the grooves.
To make sure gas pressure can enter freely on top of and behind
the piston ring . 4
Engine Category
Q:
During operation of the main engine, the exhaust temperature increases on one of the cylinders. The turbocharger starts surging and smoke is coming from the inlet air filter. What is the probable cause ?
1) 2) 3) 4)
Scavenge box fire.
High back pressure in the exhaust system. Turbocharger failure.
Fuel valve seized in open position.
1 Engine Category
Answer :
Q:
You are experiencing blow-by on the main engine but, due to operational circumstances, it is impossible to stop and carry out a piston overhaul. What is the correct action to take ?
1) 2) 3) 4)
No action is necessary.
Reduce speed and closely monitor exhaust temperature on the affected unit.
Increase cylinder oil consumption.
Reduce speed temporarily and increase cylinder oil supply.
4 Engine Category
Answer :
Q:
You have installed a new bearing in the main engine. What is the necessary action to take during the running in period ?
1) 2) 3) 4)
No action is required to be taken.
Allow for one hour running with appropriate temperature monitoring of the bearing.
Allowance must be made for a running in period with reduced speed and careful temperature monitoring.
Stop after 30 minutes running and hand feel the bearing.
3 Engine Category
Answer :
Q:
You are experiencing major surging in the fresh water cooling system. What could be the reason?
1) 2) 3) 4)
The cooling water temperature is too low. You have a cracked liner, or cover. The expansion tank is empty.
The fresh water-circulating pump is malfunctioning.
2 Engine Category
Q:
Why is it important to check the timing on the cylinder oil lubricators ?
1) 2) 3) 4)
To get the right amount of oil into the cylinder. To avoid excess lubrication.
To avoid high temperature in the combustion chamber. To get the oil into the cylinder when the piston is in the correct
position. 4
Engine Category
Answer :
Q:
Why is the tightening of the timing chain important ?
1) 2) 3) 4)
To get the right timing on the chain. To reduce vibration in the chain.
To avoid wear down of chain and chain wheel teeth and a potential breakdown.
To reduce the noise level.
3 Engine Category
Answer :
Q:
What will the effect be if a fuel injector valve is dripping after completion of injection ? 1) 2) 3) 4) Better combustion. Damage to piston & liner. Less carbonizing.
Greater output of the engine.
2 Engine Category
Answer :
Q:
How is the opening pressure (setpoint) adjusted in a fuel injector valve ? 1) 2) 3) 4) By length of stroke. By camshaft regulation. By oil pressure. By spring adjustment. 4 Engine Category Answer :
Q:
Why blow the engine over on starting air before a start?
1) 2) 3) 4)
To be sure that water has not collected in the fire cylinders. To be sure that no parts are loose, or that the engine is blocked from rotation.
To get fresh air into cylinders ensuring a safe start of the engine. To be sure that all indicator cocks are closed and there is no
passage into the combustion chamber. 1
Engine Category
Answer :
Q:
You have a cylinder liner with 8 outlet holes for cylinder lubrication, how many clogged holes can you tolerate ?
1) 2) 3) 4) 0 1 2 3 1 Engine Category Answer :
Q:
What do you consider to be the most important task on completion of maintenance
work on the piston?
1) 2) 3) 4)
Starting the auxiliary blower to ventilate the scavenging belt, the cylinder liners, to ensure that the engine has sufficient fresh air to Starting the engine to see that it rotates.
A search inside the crankcase for tools and rags.
Patching up destroyed paintwork on the crankcase doors.
3 Engine Category
Answer :
Q:
A clogged or dirty lubrication oil filter can best be detected by ... .
1) 2) 3) 4)
visual inspection of the filter elements. a decrease in oil viscosity.
the pressure drop across the filter. high lube oil temperature.
3 Engine Category
Q:
What can happen with lubrication oil cooled pistons if you stop the lubricating oil pump immediately after you stop the engine?
1) 2) 3) 4)
Nothing will happen.
Overheating of the piston and oil coke deposits in the cooling chambers.
The oil flashpoint will change.
You preserve the oil sealings in the piston.
2 Engine Category
Answer :
Q:
You have checked the oil viscosity in an auxiliary engine with the viscosity test kit. The result shows that the viscosity is high. What will you do ?
1) 2) 3) 4)
Decrease the cooling water temperature for the oil. Increase the cooling temperature for the oil. Increase the lubrication oil pressure. Clean the system and change the oil.
4 Engine Category
Answer :
Q:
You have checked the oil viscosity in an auxiliary engine with the viscosity test kit. The result shows that the viscosity is low. What will you do ?
1) 2) 3) 4)
Clean the system and change the oil. Increase the lubrication oil temperature. Start to purify the oil.
Decrease the lubrication oil temperature.
1 Engine Category
Answer :
Q:
What could cause engine oil to turn a "milky" colour?
1) 2) 3) 4) Overheating. Water contamination. Fuel contamination. The oil is old.
2 Engine Category
Q:
If you have a fuel injector nozzle with 10 holes, how many clogged holes are acceptable ?
1) 2) 3) 4) 0 1 2 3 1 Engine Category Answer :
Q:
Lapping a valve and valve seat together means ... .
1) 2) 3) 4)
adjusting the overlapping of the inlet and exhaust valves.
grinding the valve against the valve seat to obtain a uniform sealing surface.
machining the valve in a lathe. repairing by welding.
2 Engine Category
Answer :
Q:
Why do diesel engine manufacturers recommend grinding the valve seating surface with a half degree difference to the valve seat?
1) 2) 3) 4)
To prevent pitting of the valve seat.
To minimize heat transfer between seat and housing. To improve sealing between valve and seat.
To avoid sticking between valve and seat during high load
operation. 3
Engine Category
Answer :
Q:
What steps are to be taken in chronological order to stabilise a governor of a diesel engine after overhaul ?
1) 2) 3) 4)
Adjust speed (P) setting, than integrating, next differentiating from zero.
Set integrating to MAX, then adjust speed (P) and differential D. Set integrating to MAX, differentiating to MIN, adjust speed (P) upward.
Set integrating and differentiating to MAX, set speed (P) from zero
upwards. 1
Engine Category
Q:
You notice the sump level in an engine has increased and no new oil has been added. What action would you take ?
1) 2) 3) 4)
Drain some oil from the engine. Reduce the load and start the purifier.
Stop the engine and check for fuel or water leaks. Check the level regularly.
3 Engine Category
Answer :
Q:
The timing of the engine is delayed and the exhaust temperatures are high. How would you expect this to affect the turbocharger ?
1) 2) 3) 4)
Cause increased turbocharger revolutions. Cause surging of turbocharger.
Cause higher air and gas temperatures after the turbocharger. Cause decreased turbocharger revolutions.
1 Engine Category
Answer :
Q:
Why is a slow speed two stroke diesel the most suitable for a single fixed pitch propeller vessel?
1) 2) 3) 4)
Less complicated than medium speed engines More fuel-efficient
Affords a better engine layout
Easier to reverse and no propulsion gearbox required
4 Engine Category
Answer :
Q:
What is the best way of preventing scavenge fires in a slow speed two stroke diesel?
1) 2) 3) 4)
Keep scavenge spaces clean. Ensure fuel injectors are maintained. Maintain correct cylinder lubrication. Burn only the specified grade of fuel.
3 Engine Category