Question

Permeability is greatly dependent upon ________________

(a) Ramming of sand

(b) Sand Particle size

(c) Sand grade

(d) Moisture content

I had been asked this question in an internship interview.

The origin of the question is Moulding Sand Preparation and Conditioning in portion Pattern Materials & Moulding Sand Tests of Foundry and Forging

Answer 1

Correct answer is (a) Ramming of sand

The explanation: The permeability of sand is dependent to a great extent, on the degree of ramming, it is necessary that the specimen be prepared under standard conditions. To get reproducible ramming conditions, a laboratory sand rammer is used along with a specimen.