95NA-2
Sr. No. 10
EXAMINATION OF MARINE ENGINEER OFFICER
Function: Controlling the Operation of The Ship & Care for Persons on Board at
Management Level
NAVAL ARCHITECTURE
M.E.O. Class II
(Time allowed - 3hours)
India (2003) 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. With reference to Roll-on, Roll-off ferries:
(a) Describe the problem of free surface effect;
(b) Explain how it is intended that water should be cleared from car or cargo decks;
(c) Describe possible methods for improving the stability and survivability of these vessels.
2. (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.
3. (a) Describe the double bottom and framing arrangement used in the machinery space to cope up
with the concentrated loads and vibration, together with shaft and thrust block support.
(b) Give reasons for the choice of thrust block position.
4. (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.
5. A ballast tank is one-third full when additional ballast is added until it is two-thirds full. The
increased amount of liquid in the tank will have the greatest influence on the ____________.
(a) free surface effect
(b) transverse stability
(c) virtual rise in the center of gravity
(d) value of the moment to trim 1 inch (MT1)
Briefly justify your answer, stating why the other options were not considered
SECTION - 2
6. The widths of a deep tank bulkhead at equal intervals of 1.2 m commencing at the top are 8.0, 7.5,
6.5, 5.7, 4.7, 3.8 and 3.0 m. Calculate the load on the bulkhead and the position of the centre of
pressure, if the bulkhead is flooded to the top edge with sea water on one side only.
7. A ship 120m long floats at draughts of 5.50m forward and 5.80m aft; MCTI cm 80 tonne m, TPC
13, LCF 2.5m forward of midships. Calculate the new draughts when a mass of 110 tonne is added
24m aft of midships.
8. A ship of 15000 tonne displacement has an Admiralty Coefficient, based on shaft power, of 420.
The mechanical efficiency of the machinery is 83%, shaft losses 6%, propeller efficiency 65% and
QPC 0.71. At a particular speed the thrust power is 2550kW.
Calculate:
(a) indicated power,
(b) effective power,
(c) ship speed.
9. A watertight door is 1.2m high and 0.75m wide, with a 0-6m sill. The bulkhead is flooded with
seawater to a depth of 3m on one side and 1.5m on the other side. Draw the load diagram and from it
determine the resultant load and position of the centre of pressure on the door.
10. A ship of 8100 tonne displacement floats upright in seawater. KG = 7.5m and GM = 0.45m. A tank,
whose centre of gravity is 0.5m above the keel and 4m from the centreline, contains 100 tonne of
water ballast. Neglecting free surface effect, calculate the angle of heel when the ballast is pumped
out.
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95NA-2
Sr. No. 10
EXAMINATION OF MARINE ENGINEER OFFICER
Function: Controlling the Operation of The Ship & Care for Persons on Board at
Management Level
NAVAL ARCHITECTURE
M.E.O. Class II
(Time allowed - 3hours)
India (2003) 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.
Q5. Correct Answer : B
