95SCS-4
Sr. No. 9
EXAMINATION OF MARINE ENGINEER OFFICER
Function: Controlling the Operation of The Ship & Care for Persons on Board at
Operational Level
SHIP CONSTRUCTION AND STABILITY
M.E.O. Class IV
(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. State where the following types of corrosion may occur, and the materials commonly
involved in each case.
(i) Fretting corrosion;
(ii) Impingement corrosion;
(iii) Galvanic corrosion;
(iv) Crevice corrosion;
2. Define the following stating how they affect the ship structure and what component
parts of the ship structure help to resist the effect-
(a) Racking
(b) Water pressure effect
(c) Vibration from engine and propellers.
3. (a) Sketch in detail a bearing designed to transfer the full weight of the rudder and its
stock to the ships structure .
(b) Explain why the thrust faces are so contoured.
4. With regard to the carriage of crude oil and its associated products:
(a) (i) State the dangers involved.
(ii) State what publications give guidance on safety.
(b) Sketch and describe the operation of an explosimeter suitable for testing pump
rooms or tanks.
(c) Define the terms lower and upper flammable limits illustrating your answer by
means of a rough sketch of a hydrocarbon vapour oxygen graph.
5. Angular motion about the vertical axis of a vessel is known as ______________.
(a) yaw
(a) surge
(b) sway
(c) roll
Given a reasoned explanation to your choice of answer and why the other alternative
were not considered.
SECTION – 2
6. The ½ girths of a ship 90 m long are as follows. 2.1, 6.6, 9.3, 10.5, 11.0, 11.0, 11.0,
9.9, 7.5, 3.9 and 0 m respectively. The wetted surface area of the appendages is
2
30 m and ½ % is to be added for longitudinal curvature. Calculate the wetted surface
area of the ship.
7. A ship displaces 12000 tonne, its centre of gravity is 6.50 m above the keel and its
centre of buoyancy is 3.60 m above the keel. If the second moment of area of the
waterplane above the centreline is 42.5 x 103 m4 find the metacentric height.
8. The residuary resistance of a one-twentieth scale model of a ship in seawater is 36 N
when towed at 3 knots. Calculate the residuary resistance of the ship at its
corresponding speed and the power required to overcome residuary resistance at this
speed.
9. The waterplane area of a ship at 8.40 m draught is 1670 m 2. The areas of successive
waterplanes at 1.40 m intervals below this are 1600, 1540, 1420, 1270, 1080 and 690
m2 respectively. Calculate the displacement in fresh water at 8.40 m draught and the
draught at which the ship would be in seawater with the same displacement.
10. A bulkhead 12 m wide and 9 m high is secured at the base by an angle bar having 20
mm diameter rivets on a pitch of 80 mm. The bulkhead is loaded on one side only to
the top edge with seawater. Calculate the stress in the rivets.
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95SCS-4
Sr. No. 9
EXAMINATION OF MARINE ENGINEER OFFICER
Function: Controlling the Operation of The Ship & Care for Persons on Board at
Operational Level
SHIP CONSTRUCTION AND STABILITY
M.E.O. Class IV
(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 : A
