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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