waecE-LEARNING
Metal Works Paper 2, Nov/Dec. 2014  
Questions: 1 2 3 4 5 Main
General Comments
Strength
Weakness/Remedies









Question 4

               

4.         (a)       Explain two ways by which an acetylene gas cylinder can be distinguished
                        from an oxygen gas cylinder.         

            (b)       List three tools that are used in sheet metal work.
            (c)        State the use of a vee thread screw.
            (d)       (i)         List two properties of materials used in sheet metalwork;
                        (ii)        State two purposes of safe edge in sheet metalwork.

 

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OBSERVATION

 

Most of the candidates had difficulty answering the part  (a).  Other parts of the question posed no difficulty.  The required response to part (a)  is given below:

-           fittings for acetylene gas cylinders are painted red, while those for oxygen cylinders are painted black;

-           fittings for acetylene fuel gas cylinders have left-hand thread while those of oxygen cylinders have right-hand threads;
            -           acetylene gas cylinders are shorter than oxygen gas cylinders.

 

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