EXAMINATION PAPERS 675
Paper 12.
1. With two derricks at a hatch, rig cargo gear for starboard side, to
lift 30 cwt. at a time.
2. A hold has a capacity of 35,530 cab. ft. In it are stowed 10,400
bags of cement, each weighing 70 Ibs. and stowing at 35 cub. ft. to
the ton. How many cases stowing at 22 per ton of £0 cub. ft. can
now be stowed in the hold?
3. Describe how a centre through plate is connected in a C.D.B,
4. What is a margin plate? How is it connected to adjoining parts?
5. Explain carefully why some woods float and others sink?
6. A motor vessel burns all the fuel oil in her D.B. tanks, what effect
will this have on her centre of gravity?
7. A vessel's volume of displacement is 393,503 cub. ft. Find her
displacement in tons (a) in water density 1025; (I) in water of
density 1015, at same draught.
8. From a scale of deadweight the following was taken:—Draught 18 ft.
D.W. 4800 tons. Draught 18' 6", D.W. 4980 tons. How many
tons of cargo would be required to immerse the vessel from 18' 1"
to 18' 4" and what deadweight is there on board at the latter
draught?
9. A homogeneous log of 18" square section floats at even draught of
3" with one face parallel to the surface of the water; find the height
of the centre of gravity above the centre of buoyancy.
FIRST MATES.
Ship Maintenance, Routine, and Cargo Work.
B.T. Specimen Paper. (3 hours)
L Your vessel has sustained damage leaving harbour. Where and
how should this be recorded ?
2. How often should the crew be exercised at boat drill ? Draw up
your routine for boat drill.
3. The bilges of your ship are choked and very dirty. State in detail
how you would clean them.
4. What precautions must be taken when loading a full cargo of sawn
timber?
5. How should a magazine ior explosives be constructed ? I