DieselShip's Online Content Library

Q1. (a) What are the various Static stresses that act on a vessel at rest in still water? Explain with the aid of sketches. (10)

(b) Give examples for dynamic stresses on a vessel? (6)

Q2. (a) What is bilging and What are the effects of bilging? (8)

(b) How are bulkheads classified? (3)

(c) What are the advantages of water tight bulkheads? How is the water tight bulkhead tested? (5)

Q3. Explain the meaning and purpose of EACH of the following terms:

(a) Flare (3)

(b) Bulwark (3)

(c) Coaming (3)

(d) Freeing port (3)

(e) Scupper (2)

(f) Rise of floor (2)

Q4. Sketch a semi balanced rudder showing:

(a) A detail of the hinges or pintles about which rudder turns (4)

(b) Details of the rudder carrier bearing, which supports the weight of the rudderstock and rudder (4)

(c) State advantages of semi balanced rudder over an unbalanced rudder (4)

(d) What acts as "rudder stops"? What is their purpose and at what angle from mid position would you expect the rudder stops to be set (4)

Q5.a) What is free surface effect. (6)

b) Explain the methods used to reduce the free surface effect in ship construction and while operating the ship. (10)

Q6. (a) What is the purpose of conducting inclining experiment on a new vessel? (6)

(b) When a mass of 6 t is moved transversely through a certain distance on a ship of 4300t displacement, the deflection of an 11m pendulum is found to be 120 mm. The transverse meta-centre is 7.25 m above the keel and KG 5.46 m. Find the distance through which 6t was moved. (10)

Q7. (a) What are the various resistances acting against the motion of the ship? (6)

(b) A vessel of 10000 t displacement burns 25 t of fuel per day when her speed is 12 Knots. Calculate the probable consumption of fuel over a voyage of 3000 nautical miles at a speed of 11 knots with a displacement of 11000 t. (10)

Q8. (a) Explain why the draught of a ship decreases when it passes from fresh water to seawater and vice versa (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

Q9. (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 ship has 300 t of cargo in the hold, 24 m forward of the midships. The displacement of the vessel is 6000 t and its centre of gravity is 1.2 m forward of midships. Find the new position of the centre of gravity if this cargo is moved to an after hold, 40 m from midships. (10)

Q2. Define the main purpose of the following with respect to tank and pumping system.
(a) Weighted cocks on tank sounding pipes (4)

(b) Remote operated gear for bilge valves (4)

(c) Ventilation pipes for double bottom tanks (4)

(d) Explain why gauze is sometimes fitted to tank ventilation pipes and explain the effect of mesh size. (4)

Q4. Define centre of buoyancy and show with the aid of sketches how a vessel which is stable will return to the upright after being heeled by an external force. (16)

Q3. Explain the purpose of following and ship construction with suitable sketches. (16)

(i) Frame

(ii) Beam

(iii) Floor

(iv) Stringer

Q4. (a) What are the different classes of subdivision of fire protection in ships? (8)

(b) What are the conditions to be met by different classes of subdivision? (8)

Q5. (a) Sketch and describe the anchor and chain arrangement in the forecastle of a vessel (10)

(b) What is bitter end and when and how it is put to use? (6)

Q6. a) With a simple sketch of a fixed pitch propeller explain Rake, Leading and Trailing edge. (10)

b) What are the advantages and disadvantages of a Controllable Pitch Propeller. (6)

Q7. (a) Define Density, Relative Density (6)

(b) A bilge holding tank of 5 m length, 3 m width and 1.8 m depth has water of density 1.020 t/m3 up to a sounding of 1.3 m and oil of density 0.86 t/ m3 is floating on top of water up to an ullage of 0.3 m. Calculate the mass of water and oil in the tank. (10)

Q8. (a) What are the effects of adding mass to draught and trim of a ship? (6)

(b) The half ordinates of the waterplane area of a ship of 8200 t displacement, 90 m long are 0, 2.61, 3,68, 4.74, 5.84, 7.00, 7.30, 6.47, 5.35, 4.26, 3.16, 1.88 and o m respectively. It floats in sea water of 1.024 t/m3. Calculate the change in mean draught when moving into water of 1.005 t/m3 (10)

Q9. (a) List the causes for impairment of stability of a vessel. (6)

(b) A box-shaped vessel floats upright on an even keel as shown in fresh water of density 1000 kg per cubic meter, and the center of buoyancy is 0.50 m above the keel. Find the height of the center of buoyancy above the keel when the vessel is floating in salt water of density 1025 kg per cubic meter. (10)