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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