The size of the cutting nozzle used in oxy-acetylene cutting process depends mainly on

26) The size of a welding machine is determined by

27) Leakage should be checked before using oxy-acetylene welding equipment. What type of water can be used on the acetylene connection ?

28) In the process of soldering, you have noticed solder not sticking to sufficiently heated copper soldering bit when rubbed over solder bar. What step do you take to overcome the problem ?

29) The element used as a main constituent along with lead for soft soldering along with lead for soft soldering is