21. The welding process used in joining mild steel shanks to high speed drills, is
22. For cutting brass, the hacksaw blade should have ________ teeth per 25 mm.
23. In arc welding, the electric arc is produced between the work and the electrode by
24. A file removes the metal during
25. Lancing is the operation of
26. Notching is the operation of
27. When the dimension is expressed as $$20_{ - 0.025}^{ + 0.035},$$ then the tolerance is
28. In forehand welding, the weld is made
29. A diamond pointed chisel is used for cutting
30. Spot welding is used for welding
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