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95SCS-4 Sr. No. 6 EXAMINATION OF MARINE ENGINEER OFFICER Function: Controlling the Operation of The Ship & Care for Persons on Board at Operational Level SHIP CONSTRUCTION AND STABILITY India (2003) M.E.O. Class IV (Time allowed - 3hours) Afternoon Paper Total Marks 100 NB : (1)Answer SIX Questions : SECTION -1 :- Answer atleast TWO Questions SECTION -2 :- Answer atleast TWO Questions (2)All Questions carry equal marks (3)Neatness in handwriting and clarity in expression carries weightage (4) Illustration of an Answer with clear sketches / diagrams carries weightage. SECTION - 1 1. (a) With the aid of a sketch describe the method of attachment for a bilge keel and hence explain what protection is made to reduce the possibility of the shell being punctured in the event of damage to the keel. (b) State why the keel does not extend for the length of the ship. (c) evaluate the effectiveness of bilge keels for large wall sided vessels. 2. (a) With reference to fatigue of engineering components explain the influence of stress level and cyclical frequency on expected operating life. (b) Explain the influence of material defects on the safe operating life of an engineering component. (c) State the factors which influence the possibility of fatigue cracking of a bed –plate transverse girder and explain how the risk of such cracking can be minimized. 3. For a large passenger vessel, the center of buoyancy and the metacenter are in the line of action of the buoyant force ____________. (a) only when there is positive stability (b) only when there is negative stability (c) only when there is neutral stability (d) at all times Briefly Justify your Answer 4. An oceangoing ship of 10000 gross tons, contracted for in January 1976, and not equipped with an oily water separator, all bilge slops may be retained ________. (a) onboard in the ship's bilges (b) in the forward peak tank (c) in the oil purifier reservoir (d) in a cofferdam Briefly Justify your Answer 5. A load line for a Dredger is assigned by the ______________. (a) Minerals Management Department (MMD) (b) Department of Energy (DOE) (c) Ministry of Defence (d) a recognized classification society approved by the Coast Guard (e) None of Above Briefly Justify Your Answer SECTION - 2 6. The length of a ship is 18 times the draught, while the breadth is 2.1 times the draught. At the load waterplane, the waterplane area coefficient is 0.83 and the difference between the TPC in seawater and the TPC in fresh water is 0.7. Determine the length of the ship and the TPC in fresh water. 7. A ship 140 m long and 18 m beam floats at a draught of 9 m. The immersed crosssectional areas at equal intervals are 5, 60, 116, 145, 152, 153, 153, 151, 142, 85 and 0 m2 respectively. Calculate: (a) displacement, (b) block coefficient, (c) midship section area coefficient, (d) prismatic coefficient. 8. A plate towed through the water at 3 m/s has a frictional resistance of 12.5 N/m2 of wetted surface. The vessel has a wetted surface area of 5600 m2 and its service speed is 15 knots. If frictional resistance varies as (speed)1.97 calculate the frictional resistance per m2 and the power expanded in overcoming this resistance at the service speed. 9. A ship 120 m long, 17 m beam and 7.2 m draught has a block coefficient of 0.76. A parallel section 6 m long is added to the ship amidship. The midship sectional area coefficient is 0.96. Find the new displacement and block coefficient. 10. A box barge is 7.2 m wide and 6 m deep. Draw the metacentric diagram using 1 m intervals of draught up to the deck line. 95SCS-4 Sr. No. 6 EXAMINATION OF MARINE ENGINEER OFFICER Function: Controlling the Operation of The Ship & Care for Persons on Board at Operational Level SHIP CONSTRUCTION AND STABILITY India (2003) M.E.O. Class IV (Time allowed - 3hours) Afternoon Paper Total Marks 100 NB : (1)Answer SIX Questions : SECTION -1 :- Answer atleast TWO Questions SECTION -2 :- Answer atleast TWO Questions (2)All Questions carry equal marks (3)Neatness in handwriting and clarity in expression carries weightage (4) Illustration of an Answer with clear sketches / diagrams carries weightage. Answers Answer for Question No. 3 Correct Answer : D Answer for Question No. 4 Correct Answer : A Answer for Question No. 5 Correct Answer : D