Question

At the last of shell moulding procedure, the Dump box is rotated backward for adhering of as much as the possible amount of sand to the metallic pattern.

(a) True

(b) False

I had been asked this question during an interview for a job.

My question is based upon Shell Moulding in chapter Special Casting Techniques of Casting-Forming-Welding I

Answer 1

The correct option is (b) False

The best explanation: When after the achieving of a desired thickness of the shell, the dump box is rotated backward by 180 degrees so that the excess of sand falls back into the box, leaving the formed shell intact with the pattern. Thickness of the shell depends on the temperature of the pattern and the coating time of sand in contact with the heated pattern.