A substance used to dissolve oxides on the surface of conductor using the soldering process is called as

49) The solder wire used in electronic soldering melts at

50) Which method of soldering iron is used for soldering miniature components on printed circuit boards (PCB) ?

51) Zinc is added by 2% along with lead and tin in solders, which are used for

52) Which one of the following is preferred to use in soldering aluminium cables with a ferrule joint ?