EXAMINATION PAPBBS 691
6 A vessel's centre of gravity is 8 feet above the centre of buoyancy
and 10 feet above the keel. The transverse metacentre is 11-5
feet above the keel and the ship's total displacement is 1600 tons,
A weight of 8 tons is moved athwartships 20 feet. Find the angle
of heel.
Paper 10.
1. What is the meaning of the following expressions heard in shipyards
doing repairs:—(a) Chopping; (6) off and fair; (c) fair on?
2 How are rivets in a riveted joint tested? What is the pitch of rivets
in (a) shell plating; (6) margin frame angles; (c) tank re verse angles?
3. What is meant by opening out for survey, and at what periodical
intervals are the surveys extended?
4. Sketch a section through a hatchway and show the connections of
hatchway beams and coamings.
5. Define transverse metacentre and initial transverse metacentric
height. A vessel of 5000 tons displacement, transverse meta-
centre 18 ft. above the keel and centre of gravity 15 8 ft. above
the keel. The vessel is heeled 7°. Find her righting moment.
6. A vessel is 3330 tons displacement, has a draught 17 ft. forward and
16 ft. 6 in. aft. Her T.P.I, is 21 tons and her I.T.M. 275 foot-tons.
Her No. 5 tank, which holds 78 tons, is run up. Find her new draught
if the centre of gravity of the ballast is 50 feet abaft the tipping
centre assumed amidships