Question

_____________ is used for removing adhering sand from the castings.

(a) Rumbling

(b) Air blasting

(c) Wire brush

(d) All of the mentioned

This question was posed to me at a job interview.

The query is from Fettling and Cleaning of Castings in division Concept of Gating and Risering of Foundry and Forging

Answer 1

The correct option is (d) All of the mentioned

To explain I would say: Rumbling or Trumbling employs a barrel which is rotated at a certain speed and the castings are put and the sand is removed. Air blasting is a method in which air is supplied at a high speed to remove the sand. Wire brush does the same operation. Hence all the above are used to remove the sand.