DieselShip's Online Content Library

Q1. a) What are the advantages of corrugated bulkheads? (6)

b) Sketch and describe a corrugated transverse watertight bulkhead (10)

Q2. (a) Describe in detail how brittle fracture is instrumental in causing failure of materials. (6)

(b) Describe how a material is tested to assess the resistance to this type of failure. (4)

(c) Suggest where this type of failure would be likely and explain how the likelihood of failure is reduced. (6)

Q3. With reference to hull protection against corrosion and fouling, write a brief explanation of each of the following:

(a) Sacrificial anodes (6)

(b) Impressed Current system (6)

(c) Means of preventing marine growth and fouling (4)

Q4. Define the following stating how they affect the ship structure and what component parts of the ship structure help to resist the effect:

(a) Racking (4)

(b) Panting (4)

(c) Pounding (4)

(d) Vibration from engine and propellers. (4)

Q5. In the absence of external forces, adding weight to one side of a floating vessel, will cause the vessel to (16)

(a) Heel until the angle of loll is reached.

(b) List until the centre of buoyancy is aligned vertically with the centre of gravity.

(c) Trim to the side opposite TCG until all moments are equal.

(d) Decrease draft at the centre of flotation.

Briefly justify your answer.

Q6. (a) With aid of a simple sketch, show the normal positions of centre of gravity of a stable ship relative to keel, centre of buoyancy and meta centre. (6)

(b) A bulkhead 9 m deep is supported by vertical stiffeners 750 mm apart. The bulkhead is flooded to the top edge with sea water on one side only. Calculate: (10)

(a) Shearing force at top.

(b) Shearing force at bottom.

(c) Position of zero shear.

Q7. (a) What is the purpose of conducting an inclining experiment on a new vessel? (6)

(b) A ship of displacement 10010 tonnes has KM 6.7m and GM 0.76m. A mass of 10 tonnes having KG 7.6m is shifted transversely. The deflection of a pendulum of length 7.6m is 0.125m. Find the distance through which the mass is shifted. Also find the position of the new centre of gravity above the keel due to the removal of the same mass. (10)

Q8. A hopper barge of box form 50 m long and 10 m wide floats at a draught of 2 m in seawater when the hopper, which is 15 m long and 5 m wide, is loaded with mud having relative density twice that of the seawater, to the level of the waterline. Doors in the bottom of the hopper are now opened allowing the mud to be discharged. Calculate the new draught. (16)

Q9. a) Sketch and describe the midship section of a bulk carrier, labelling the structural members. (6)

b) A vessel 40 m long has a constant cross-section in the form of a trapezoid 10 m wide at the top, 6 m wide at the bottom and 5 m deep. It floats in sea water at a draught of 4 m. Calculate its displacement. (10)