Scribd
Upload
65 views2 pages

Function: Controlling The Operation of The Ship & Care For Persons On Board at Operational Level

The document is an examination for a Marine Engineer Officer Class IV. It covers topics related to ship construction and stability. The exam has two sections, with Section 1 focusing on corrosion processes, watertight doors, rudder design, and refrigerated hold spaces. Section 2 covers topics like calculating dimensions for a new barge based on volume, calculating waterplane area and centroid from ordinates, fuel savings based on different voyage speeds, and problems involving metacentric height and center of gravity. Examinees are instructed to answer at least two questions from each section and sketches or diagrams are encouraged where relevant.

Uploaded by

Anshu Bhushan
Copyright
© © All Rights Reserved
We take content rights seriously. If you suspect this is your content, claim it here.
Available Formats
Download as DOC, PDF, TXT or read online on Scribd
65 views2 pages

Function: Controlling The Operation of The Ship & Care For Persons On Board at Operational Level

The document is an examination for a Marine Engineer Officer Class IV. It covers topics related to ship construction and stability. The exam has two sections, with Section 1 focusing on corrosion processes, watertight doors, rudder design, and refrigerated hold spaces. Section 2 covers topics like calculating dimensions for a new barge based on volume, calculating waterplane area and centroid from ordinates, fuel savings based on different voyage speeds, and problems involving metacentric height and center of gravity. Examinees are instructed to answer at least two questions from each section and sketches or diagrams are encouraged where relevant.

Uploaded by

Anshu Bhushan
Copyright
© © All Rights Reserved
We take content rights seriously. If you suspect this is your content, claim it here.
Available Formats
Download as DOC, PDF, TXT or read online on Scribd
You are on page 1/ 2

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

M.E.O. Class IV
(Time allowed - 3hours)
India (2004) 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 corrosion processes:
(a) Explain the mechanism of:
(i) Stress corrosion;
(ii) Corrosion fatigue.
(b) 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. (a) Sketch a water –tight door and frame showing manner of attachment to bulkhead and the
additional reinforcement carried by the bulkhead to compensate for the aperture.
(b) Explain how water –tightness of the door and frame mating surface is ensured with an hydrostatic
pressure tending to force the faces apart.
(c) Describe the means of remote closing operation of the door and state how many closing stations
there are and their position.
3. Sketch a semi balanced rudder of your choice showing :-
(a) A detail of the hinges or pintels about which rudder turns.
(b) Details of the rudder carrier ring, which supports the weight of the rudderstock and rudder.
(c) State advantages of semi balanced rudder over an unbalanced rudder.
(d) What acts as “rudder stops”? What is their purpose and at what angle from mid position would
you expect the rudder stops to be set.
4 (a) With reference to refrigerated hold spaces describe using simple sketches:
(i) A tween deck scupper;
(ii) An insulated brine pipe passing through a watertight bulkhead;
(b) With reference to draining water from decks, describe using simple sketches:
(i) A scupper pipe leading from the waterway in the tween decks to the outside of the vessel;
(ii) A bulwark freeing port with the flap hinged at the top and opening outward.
5. With regards to the metacentric height, which of the following statements is true?
(a) It is used to indicate the quality of initial stability.
(b) It is located below the center of buoyancy.
(c) It is measured vertically above the center of buoyancy.
(d) Its determination is the objective of the inclining experiment.
Briefly justify your answer
SECTION - 2
6. A box barge is 75 m long, 9 m beam and 6 m deep. A similar barge having a volume of 3200 m 2 is to
be constructed. Calculate the length, breadth and depth of the new barge.
7. The ½ ordinates of a waterplane 120 m log are as follows:
Section AP ½ 1 1½ 2 3 4 5 6 7 8 8½ 9 9½ FP
½ ord 1.2 3.5 5.3 6.8 8.0 8.3 8.5 8.5 8.5 8.4 8.2 7.9 6.2 3.5 0 m
Calculate:
(a) waterplane area
(b) distance of centroid from midships.
8. A ship travels 2000 nautical miles at 16 knots and returns with the same displacement at 14 knots.
Find the saving in fuel on the return voyage if the consumption per day at 16 knots is 28 tonne.
9. The pitch of a ship’s propeller is 6m. At 105 rev/minimum the apparent slip is 10% and the real slip is
24%. Calculate the slip and the wake fraction.
10. A ship of 7000 displacement has KM 7.30 m. Masses of 150 tonne at a centre3.0 m above and
60 tonne at a centre 5.5 m below the original centre of gravity of the ship are placed on board.
A ballast tank containing 76 tonne of water at KG 0.60 m is then discharged.
Calculate the original height of the ship’s centre of gravity above the keel if the final metacentric
height is 0.50 m and KM is assumed to remain constant.

-------------------------XXXXXX----------------------------

You might also like