1. In arc welding eyes need to be protected against-
Ans: Ultraviolet rays and infrared rays
2. The material used for coating the electrode is called
Ans: Flux
3. Which of the following welding process uses non-consumable electrode?
a) MIG welding b) TIG welding c) Ion beam welding d) Plasma welding
Ans: TIG welding
4. Projection welding is
Ans: Multi spot welding
5. Forge welding is best suited for
Ans: wrought iron
6. In arc welding, temperature of the following order may be generated-
a) 1,000 oC b) 1,500 oC c) 5,500 oC d) 8,000 oC
Ans: 5,500 oC
7. Weld spatter is a-
Ans: Welding defect
8. Gray Iron is usually welded by-
Ans: Gas welding
9. In Thermit welding, the Iron oxide and Aluminium oxide are mixed in the proportion of
Ans: 3 : 1
10. TIG welding is best suited for welding-
Ans: aluminium
11. The following welding process uses consumable electrode
a) TIG b) MIG c) Thermit d) Laser
Ans: MIG
12. The amperage to be used in arc welding is dependent up on
Ans: electrode rod thickness
13. The most commonly used flame in gas welding is
Ans: neutral
14. Oxygen to acetylene ratio in case of neutral flame is-
Ans: 1 : 1
15. Filler metal is used in-
Ans: arc welding
16. Thermit welding is a form of-
Ans: fusion welding
17. In resistance welding the electrode material is made of
Ans: copper
18. The flux in submerged arc welding is in the form of
Ans: granules
19. Oxygen to acetylene ratio in case of carburising flame is-
Ans: 0.9 : 1
20. Acetylene gas is generated from-
Ans: calcium carbide
21. Metals like Copper and Brass can be welded by-
Ans: Oxidising flame
22. A soldering Iron bit is made of-
23. Soldering Iron is made of wedge shape in order to
Ans: retain heat
24. The temperature range for soldering process is
Ans: 180 oC to 250 oC
25. The commonly used flux for brazing is
Ans: Borax
26. In TIG & MIG welding the gas used will be
Ans: Helium
27. The acetylene cylinder is usually painted with
Ans: maroon colour
28. Arc welding uses following electric supply
a) AC b) DC c) AC & DC d) spiral wave form
Ans: AC & DC
29. Pressure reducing valve is located on
Ans: gas cylinder
30. Open circuit voltage for arc welding is of the order of
Ans: 40 - 95 V
