Question

Which of the following characteristic is not expected in the green sand in the green sand molding process?

(a) Flowable nature

(b) Plastic Nature

(c) Reactivity

(d) Permeability

This question was posed to me during a job interview.

The doubt is from Green Sand Moulding in chapter Moulding Machines & Special Moulding Processes of Foundry and Forging

Answer 1

Right option is (c) Reactivity

Easy explanation: If the green sand develops the quality of reactivity in it, it will have significant defects in it which will result in discarding of the entire casting. Hence all the qualities except reactivity are desired in the sand.