What is the most uncertain factor in planning a ship upgrade?
The ship's life expectance
The future interest rates
The future oil price
The shipyard capacity
After modification, a ship is expected to save 10% fuel on a new propeller, and 10% on an improved engine. What would be the total gain?
20% fuel saving
10% fuel saving
15% fuel saving
19% fuel saving
Which type of vessel is most fuel saving for a specific cargo?
A long and wide vessel
A short and deep vessel
A long and shallow vessel
A long and slim vessel
How much fuel could be saved by building a bulb bow?
5%
20%
40%
60%
What would be most fuel saving?
A large propeller and a slow revolving shaft
A large propeller and a fast revolving shaft
A small propeller and a slow revolving shaft
A small propeller and a fast revolving shaft
Where would a nozzle (tunnel) propeller be most appropriate?
On long distance cargo ships
On slow moving, high load ships
On fast coastal ships
With a high revolving propeller
What are the minimum instruments needed to estimate fuel consumption?
A fuel gauge and a speed log
A fuel gauge and an exhaust thermometer
A fuel gauge and a Doppler log
A fuel gauge and a radio navigation instrument
What is the advantage to convert to heavy fuel?
Its worldwide availability
Its better viscosity control
It requires less engine maintenance
Its price
In a marine engine, how much energy is lost in form of heat?
About 5%
About 20%
About 50%
About 75%
On a vessel fitted with a variable pitch propeller, what is most energy saving?
A high pitch and fast RPM
A high pitch and low RPM
A low pitch and fast RPM
A low pitch and low RPM
What is the best way of adjusting the speed of a variable pitch vessel?
adjusting the load.
adjusting the pitch
adjusting the RPM
How often does traditional antifouling paint need to be applied?
Once a year
Twice a year
Every second year
Every third year
What is the average roughness of a new build hull?
5 micrometer
10 micrometer
100 micrometer
500 micrometer
What is the average roughness of a newly polished propeller?
5 micrometer
10 micrometer
100 micrometer
500 micrometer
On an average vessel, how much speed loss would justify docking?
0.1 knot
0.5 knot
1 knot
2 knots
How often does self-polishing antifouling need to be applied?
Every 6 months
Every 12 months
Every 18 months
Every 24 months
Which type of vessel won't really benefit from self-polishing antifouling?
Slow moving tug boats
Ice operating vessels
Riverboats
Non-ferrous hulls.
What are the benefits of fuel additives?
It lowers considerably the fuel consumption
It increases considerably the time between maintenance
It saves considerably on spare parts
It doesn't make any significant changes
How often should a marine engine be calibrated for ignition?
Every day
Once a week
Once a month
Twice a year
An engine vibrating at low speed has most likely a failure in?
A shaft
A gear
A bearing
A cylinder
3