THE HONGKONG GOVERNMENT GAZETTE, MARCH 11, 1910.
289.
149
Define the following terms:--Ampère, volt, ohm, watt. electrical horse-power?
290.
What is the measure of an
Explain the uses of switches, brushes, commutators, cut-outs, field-magnets, armatures and resistance-coils.
291.
Why is it desirable to fit a dynamo in a cool place on board ship?
292.
What undersirable effect will ultimately occur to an electric wire, whose sectional area is constantly diminishing, say, through corrosion?
293.
What danger might arise from leading electric wires through coal bunkers?
294.
Is it better to lead electric wires above or below side-scuttles? Why?
295.
What instruments are used on board ship to ascertain the strength of an electric current?
296.
Many ocean-going steamers are fitted with hydraulic cranes, &c. Where do they obtain their power? How is the hydraulic pressure kept at a relatively constant amount?
297.
Is any difficulty experienced in working hydraulic cranes in frosty weather? If so, why?
298.
Describe any steam steering gear you are acquainted with.
299.
When the helm is put hard over and the ship is going full speed ahead, what prevents the rudder returning to the amidship position?
300.
In the case of a steamship under way does the officer, or man manipulating the steam steering wheel overcome any resistance exerted by the rudder?
301.
Explain clearly what is being done by a helmsman manipulating the wheel of a steam. steering engine.
302.
Is there any difference between the amount of horse-power required to put a helm hard over, in a given time, when the vessel is going full speed ahead, and when she is going full speed astern? This question refers to the case of a steamer fitted with one rudder only, and demands a more complete answer than merely "yes" or
no".
303.
What precautions should be taken before removing a manhole-door of a steam boiler? In the absence of such precautions what casualties might occur?
304.
Describe the chief features of the engine-governor fitted to a steamer you have served in. Describe its action. Give the maker's name, and name of ship.
NOTE. The following six questions refer to oil-motors fitted to launches which carry
passengers :—
305.
Name the principal parts of an oil-motor, and briefly state their functions. Give the name of the makers of the motor.
306.
What
What kind of oil is usually employed in oil-motors? What is its flash-point? is its specific gravity? What its calorific power? What precautions are taken in its storage to guard the public against casualty by fire or explosion?
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