Q1. (a) List out the merits and demerits of longitudinal framing system. Explain which demerits of longitudinal framing system are mitigated by use of mixed framing system without affecting the merits?
(b) List and explain with a sketch the type of loads and failure mechanism that would be of concerns for the longitudinal strength of the hull girder of a bulk carrier
Q2. With reference to a periodically unattended machinery space of a dry cargo vessel discusses the requirements for;
A. Protection against flooding;
B. Control of propulsion machinery from the navigating bridge.
Q1. Draw and describe the construction of a forepeak tank. Explain how are the effects of panting and pounding taken care with help of neat sketches?
Q4. With reference to Underwater Inspection in lieu of Dry docking (UWILD)
A. Explain in detail, how an underwater survey is carried out;
B. State the requirements to be fulfilled before an underwater survey is acceptable to the survey authority.
C. Construct a list of the items in order of importance that the underwater survey authority should include.
Q5. While taking over a new ship in shipyard, as a second engineer officer elaborate your inspections/checks and significance of following:
(a) Governing factors for having optimum stability in both the static and dynamic categories.
(b) Intact stability criteria that the new ship must fulfil
(c) Effect of Draft on Righting Arm
(d) Cross Curves of stability
(e) Free communication effect ( stability changes that occur when an off-center compartment is in free communication with the sea)
Q9. (a) Explain the concept of dynamical stability.
(b) A ship of 5000 tonne displacement has three rectangular double bottom tanks A: 12m long and 16m wide; Tank B: 14m long and 15m wide; C 14m long and 16m wide.
calculate the free surface effect for any one tank and state in which order the tanks should be filled when making use of them for stability correction.
Q7. A. Describe stability requirement for dry-docking.
B. A ship of 8000 tonne displacement floats upright in seawater. KG = 7.6m and GM = 0.5m. A tank, KG is 0.6m above the keel and 3.5m from the centre line, contains 100 tonne of water ballast. Neglecting the free surface effect, calculate the angle which the ship will heel, when the ballast water is pumped out.
Q8. A. Define longitudinal centre of gravity (LCG) and longitudinal centre of buoyancy (LCB).
B. The immersed cross-sectional area of a ship 120m long, commencing from aft are 2,40,79,100,103,104,104,103,97, 58 and 0 m2 calculate :
(i) Displacement;
(ii) Longitudinal position of the centre of buoyancy.
Q7. An oil tanker 160m long and 22m beam floats at a draught of 9m in seawater. Cw is 0.865. The midships section is in the form of a rectangle with 1.2m radius at the bilges. A midships tank 10.5m long has twin longitudinal bulkheads and contains oil of 1.4 m3/t to a depth of 11.5m. The tank is holed to the sea for the whole of its transverse section. Find the new draught.
Q8: A. What is meant by the Admiralty Coefficient and the Fuel Coefficient?
B. A slip of 14900 tonne displacement has a shaft power of 4460 Kw at 14.55 knots. The shaft power is reduced to 4120 kW and the fuel consumption at the same displacement is 541 kg/h. Calculate the fuel coefficient for the ship.
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