683 NICHOLLS'S SEAMANSHIP AND NAUTICAL KNOWLEDGE
4. How do you measure rope and find its safe working load? How
do you measure blocks? What size of block would you use with 2|"
wire and with 3" manilla rope?
5. What are the duties of a watchkeeping officer with regard to
ventilation of cargo?
6. (a) What is the difference between grain space and bale space?
(b) Distinguish between deadweight and measurement cargo.
7. Ship 3300 tons deadweight. Stores and fuel 440 tons. Loading
cotton at 70 cubic feet per ton as follows:—Osaka 900 tons; Osaka-
Kobe (optional) 1000 tons; completing for Kobe. The hold
capacities are:— No. 1, 49,700 cub. ft.; No. 2, 51,350 cub. ft.; No. 3,
41,570 cub. ft.; No. 4, 36,000 cub. ft. Describe the stowage,
dunnage, separation and ventilation.
8. A three-fold purchase is used to lift out a 2-ton weight. A luff tackle
is attached to the hauling part of the purchase. Find the minimum
force required to lift out the weight and the stress on the supporting
shackle allowing 10 per cent, for friction.
FIRST MATE.
Ship Construction and Stability.
B.T. Specimen Paper. (3 hours)
1. Sketch and name the various rolled sections used in ship
construction.
2. What is the usual method adopted for distinguishing the strakes
and plates of a ship ?
3. What is a web frame ? Give a rough sketch showing how it is built
up.
4. Name the different members of the transverse framing in a ship with
ordinary floors.
5. Define (a) reserve bouyancy, (6) displacement, (c) centre of gravity,
(d) centre of buoyancy.
6. How does increase of freeboard affect stability ?
7. In a vessel of 3000 tons displacement a weight of 100 tona is moved
20 feet, and a weight of 50 tons moved 10 feet upwards in a
vertical direction.* Calculate the effect on centre of gravity.
8* What is meant by a vessel being (a) stiff, (6) tender ? What effect
has the flooding of a double bottom tank on the stability of a ship?