DieselShip's Online Content Library

Q1. A. Sketch a transverse section through the hold space of a container ship hull;

B. Referring to the sketch in (A) describe how adequate structural strength is built into the hull.

Q3: With reference to dry docking, define the responsibility of the second engineer;

A. Prior to docking;

B. Whilst the vessel is in dry dock;

C. Prior to flooding and leaving the dock.

Q3. A. Describe the safety precautions which are taken when using points, B. Describe the use of self-polishing anti-fouling paint, and the proposed banning of tributyltin (TBT)

Q2. State how and why the following machinery items are effected when the maximum service speed of a Vessel is consistently maintained in heavy weather.

A. Intermediate shafting,

B. Propeller shafting,

C. Shafting coupling bolts,

D. Main thrust pads.

Q2. With reference to Roll-on Roll-off ferries –

A. Describe the problem of free surface effect;

B. Explain how it is intended that water should be cleared from car or cargo decks;

C. Describe possible methods for improving the stability and survivability of these vessels.

Q9. With respect to Buoyancy of a vessel:

A. What do you understand by reserve buoyancy what happen if the lost buoyancy is greater than the reserve buoyancy?

B. A forward deep tank 12 m long extends from a longitudinal bulkhead to the ship’s side. The widths of the tank surface measured from the longitudinal bulkhead at regular intervals are 10, 9, 7, 4 and 1 m. Calculate the second moment of area of the tank surface about a longitudinal axis passing through its centroid.

Q7. A. Explain how to distinguish between list and loll and describe how to return the ship to the upright in each case. B. A ship 120m long has a light displacement of 4000 tonne and LCG in this condition 2.5m aft of midships.  The following items are then added:

Using the following hydrostatic data, calculate the fine draughts:

Q8. A. Explain how the distribution of masses affects rolling and pitching

B.A ship turns is a circle of radius 100 metres at a speed of 15 knots. The GM is 2/3 metres and BG is 1 metre. If g = 981 cm/sec2 and 1 knot is equal to 1.8532 Km/hour, find the heel due to turning.

Q7. A. Describe the effect of cavitation’s on the propeller blades.

B. A propeller 4.6m diameter has a pitch of 4.3m and boss diameter of 0.75. The real slip is 28% at 95 rev/min. Calculate the speed of advance, thrust and thrust power.

Q8. A. Describe the stability requirements of a ship for dry-docking.

B. A ship 130m long displaces 14000 tonne when floating at draughts of 7.5m forward and 8.10m aft. GML – 125m, TPC – 18,LCF-3m aft of midships. Calculate the final draughts when a mass of 180 tonne lying 40m aft of midships is removed from the ship.