11. What is the form of flux used in submerged arc welding?
(a) Paste
(c) Granulated
(b) Powder
(d) Coil
12. The type of filler metal normally used in submerged arc welding is –
(a) Cored wire
(c) Lightly coated wire
(b) Bare wire
(d) Heavily coated wire
13. Which two items in MIG welding would need to be changed if the size of mild steel wire
electrode is changed from 0.9 mm to 1.2 mm?
(a) Contact tip and shroud
(c) Gas diffuser and drive rollers
(b) Contact tip and drive rollers
(d) Gas bottle and earth clamp
14. MAG process differs from MIG in that it uses instead of inert gases.
(a) Hydrogen
(c) CO,
(b) Nitrogen
(d) All of these
15. Electroslag welding is –
(a) An arc welding process
(c) A non-arc welding process
(b) A gas welding process
(d) A resistance welding process
16. Electroslag welding is done in –
(a) Flat position
(c) Vertical position
(b) Overhead position
(d) Any position
17. In atomic hydrogen welding a single phase AC arc is maintained between two electrodes.
(a) Carbon steel
(c) Tungsten
(b) Copper
(d) Aluminium
18. Which statement applies to thermit welding?
(a) It needs no external source of current
(b) It is suitable for joining parts having heavy cross — section
(c) The slag formed in this process is Al,O3
(d) All of these
19. Steel is an alloy of –
(a) Chromium and iron
(c) Iron and carbon
(b) Sulphur and phosphorous
(d) Manganese and nickel
20. Post — heating of weld is applied –
(a) Immediately after welding
(c) During welding
(b) Before welding
(d) None of these