21.
The directional solidification in casting can be improved by using

22.
In a compound die

23.
In a simple die

24.
Linde welding uses

25.
A neutral flame is obtained by supplying

26.
The electrodes used in spot welding have a tip of

27.
The cold chisels are made by

28.
The minimum size of a bloom is

29.
When the file is moved to and fro over the work, it is known as

30.
The binder commonly used in making oil sand, is

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