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.