DieselShip's Online Content Library

Q5.a) Name the different type of rudders. (6)

b) Draw a labelled sketch of an unbalanced rudder fitted onto a rudder post (10)

Q2.a) Write short notes on panting, pounding and Raking (8)

b) Explain with the aid of simple sketches hogging and sagging of a vessel (8)

Q3. Draw a labeled sketch of one half of midship section of a single hull bulk carrier. (16)

Q4. a) What are the advantages of corrugated bulkheads? (6)

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

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 double bottom tank is 1.2 m deep and has a sounding pipe extending 11 m above the tank top. The tank is filled with oil (rd 0.89) to the top of the sounding pipe. The double bottom floors are spaced 750 mm apart and are connected to the tank top by riveted angles, the rivets having a pitch of 7 diameters. If the maximum allowable stress in the rivets is 30 MN/m2, calculate the pressure in kN/m2 on the outer bottom and the diameter of the rivets. (16)

Q7.  The pitch of a propeller is measured by means of a batten and cord. The horizontal ordinate is found to be 40 cm while the vertical ordinate 1.15 m at a distance of 2.6 m from the centre of the boss. calculate the pitch of the propeller and the blade width at that point. (16)

Q8. The centre of gravity of a ship of 5000 tonne displacement is 6 m above the keel and 1.5 m forward of midships. Calculate the new position of the centre of gravity if 500 tonne of cargo are placed in the t’ween decks 10 m above the keel and 36 m aft of midships. (16)

Q9. A ship's speed is increased by 20% above normal for 8 hours, reduced by 10% below normal for 10 hours and for the remaining 6 hours of the day the speed is normal. Calculate the percentage variation in fuel consumption that day from normal.