During the tumbling process for cleaning of the casting, the fine projections of the metal are removed by
Metal cutting
Metal melting
Rubbing and abrasion
Chemical reaction
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Tumbling is done in a tumbling mill.
It removes particles from the surface by rubbing action of the cast parts with each other.
In blasting, the abrasive particles are thrown on the surface of the casting in a carrying medium.
From the explanation above, the correct answer is :
Rubbing and abrasion action.
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