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Plumber Practice Test: Welding
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Plumber Practice Test: Welding
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25 Questions

1. What is the reason for metal surface to be cleaned before soldering?
2. Which acid is used as a flux for stainless steel in soldering?
3. Which inorganic flux is used in the form powder or mixed with water to clean the iron or steel surfaces?
4. What is the application of fine solder?
5. What is the pressure range between the dissolved acetylene gas cylinder?
6. Which type of filler metal does not require flux while gas welding?
7. Which one is closed first while shutdown oxy-acetylene plant?
8. What colour is painted on oxygen cylinder?
9. Which type of filler rod contains iron, carbon, silicon and manganese?
10. What is the angle of blow pipe held in right ward welding?
11. What are the weld positions for pipes by gas welding?
12. What is the root gap provided in pipe of wall thickness 3 mm for leftward welding technique?
13. What is the alloy of soft solder?
14. What is the effect, if interchanged to fix oxygen and acetylene regulators to cylinders?
15. What is the reason for weak joint while soldering?
16. What is the diameter of filler rod used to weld 2.5mm thick mild steel by leftward technique?
17. Which material is used to manufacture soldering iron tip?
18. What is the maximum permitted gap between the two joining surface in brazing?
19. What is the name of brazing if parts to be brazed are submerged in a molten or chemical both?
20. Which flux is used in iron and steel while brazing?
21. Which is the important part in soldering iron?
22. Which type of filler rod contains iron, carbon, silicon, sulphur and phosphorus?
23. Which type of flux removes oxides on base metal surface?
24. What size of thickness metal used only in rightward technique?
25. Which is organic flux?

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