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On increasing the binder content, what in the moulding sand gets reduced?

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in Casting-Forming-Welding I by (687k points)
On increasing the binder content, what in the moulding sand gets reduced?

(a) Hardenability

(b) Strength

(c) Permeability

(d) Brittleness

I got this question in an online quiz.

My query is from Molding Sands Binders in portion Molding and Core Sands of Casting-Forming-Welding I

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Best answer
Right option is (c) Permeability

Easiest explanation: On increasing the binder content, the hardenability does not get affected. The strength and the brittleness to do not change, but on addition of too much of binder in the moulding sand, the permeability of the moulding sand gets reduced.

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