THE HONGKONG GOVERNMENT GAZETTE, MARCH 11, 1910.
pg ANNA
174.
143
Which is convection, which is radiation, and which is conduction in the following cases (1) Heat from the glowing fuel to the furnace crown? (2) Heat passing from one side of the furnace crown plate to the other? (3) Heat passing from the steam pipes in the engine room ? (4) The heat of evaporation?
173.
What are the effective heating surfaces of a marine boiler?
176.
What parts of a marine engine are exposed to danger when the temperature is below freezing point?
177.
What precations are necessary in cold climates when the temperature is below freezing point?
178.
State as many ways as you can by which a boiler might not get its full feed. A boiler, or one of a set of boilers, gets short of water although the feed valve is open its proper amount; to what causes might this be due?
179.
Of what are furnace bars generally made? About what thickuers are they at the top? About what space is between them? Are the bars put further apart for Newcastle coal than for Welsh coal?
180.
Which burns faster. Newcastle coal or Welsh coal? Which is the flaming coal? Which makes more smoke?
181.
About how many tons of steam coal will be burnt per day in four furnaces, each 3' 0" wide, and of about the usual length? On what grounds do you say so?
182.
Ahout how many tons of steam coal will be burnt per day with good triple expansion engines to drive an ordinary steamer of 40 ft. beam 10 knots an hour by steam alone? On what grounds do you say so? What percentage more coal would be required to propel the same steamer one knot faster?
183.
About how many tons of steam coal will be burnt per day with a good triple expansion engine, surface condensers, the low pressure cylinder 60 inches diameter, doing average work? On what grounds do you say so?
184.
A pair of inverted cylinder direct acting engines; there is a liner half an inch thick between the ahead eccentric rod and the eccentric strap, in overhauling the engine this piece is lost and forgotten;
What difference will its omission make in the working of the engine, on the admission, on the cut off, and on the exhaust of the steam? Which will take place earlier and which later, distinguishing between the up stroke and the down stroke?
185.
A pair of inverted cylinder direct acting engines driving a righthand screw; on which of the crosshead guide bars is the pressure greatest in the up stroke, and on which in the down stroke ?
186.
A screw propeller is getting loose, it has a little play on the shaft, sideways on the key or feather; how will this show in the engine room?
187.
How would you prove whether the centre line of the trunnions of an oscillating cylinder be fair with the centre line of the main shaft ?
188.
How can the fairness of a line of screw shafting be tested without lifting the shafts ?
189.
Where are steel forgings generally used in marine engines
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