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Answer the following questions in brief:

1.  Why air liquefaction process is extensively used for the production of commercial oxygen?

2.  Name the different stages of air liquefaction process for production of oxygen?

3.   What are the elements present in liquid air in the condenser column of air liquefaction process? Give the boiling point of         each element.

4.    Write three important properties of oxygen related to welding operation/storage of the gas.

5.    How air is purified in the air liquefaction process?

6.   “The weight of the container for liquid oxygen is several times smaller than is required for an equivalent quantity

        of gaseous oxygen”. - Explain why?

7.    Explain about the body of an oxygen cylinder.

8.   Where spindle is located? What is it's function ?

9.   Explain about the location and function of the safety device used in oxygen cylinder.

10. Why oxygen cylinders are tested and annealed periodically?

11. Explain about the oxygen cylinder valve and its protection.

12. What is the function of steel cap in a D.A. gas cylinder?

13. Explain the function of ‘fuse plugs’ in a D.A. gas cylinder?

14. Why acetylene gas is stored in cylinder in dissolved state not in compressed form?

15. Why acetylene cylinder is named as ‘D.A. gas cylinder’?