THE HONGKONG GOVERNMENT GAZETTE, MARCH 11, 1910.
244.
147
Describe the carbonic acid process of refrigeration.
245.
Of what material are the parts made which are in contact with the carbonic acid?
246.
Are escape-valves fitted to the compressors of carbonic acid machines?
247.
What is the maximum pressure found in the compressors of carbonic acid machines?
248.
What kind of pressure and other gauges are used in carbonic acid machines?
249.
In which type of machine is brine used? What is its density? Where does it circulate?
250.
Are fans for circulating air used in any of these processes? If so, why are they necessary?
251.
What means are in some cases employed for ascertaining the temperatures of refrigerat- ing chambers without entering them?
252.
What effect may the swabbing of the compressor-piston rods have upon the working of refrigerating machinery?
What is a rectifier? Explain its use?
253.
254.
Describe the cold-air process of refrigeration.
255.
Of what material are the air suction and delivery valves made? How are the valves kept on their seats?
256.
How many compressors are there to a cold-air machine?
257.
What is the duty of the expansion cylinder of a cold-air machine?
258.
What objection is there to the presence of moisture in the air passed through the cold- air machine?
259.
How is water to some extent removed from the air? What is the minimum tempera- ture of the air?
260.
What is the maximum pressure found in the compressors of cold-air machines ?
261.
What kind of pressure and other gauges are used in cold-air machines?
262.
In refrigerating engines generally, to where is the exhaust steam led ?
263.
Cold-air chambers on board ship are insulated.
264.
How and why?
Is it prudent to allow the wires of an electric circuit to pass through the insulation ? Explain fully.
265.
Describe the construction of a feed water-heater and give the name of its manufacturer.
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