Question

With an increase in volume of air passed, what change is seen in the permeable number?

(a) Increases

(b) Decreases

(c) No change occurs

(d) No relation among the two

This question was posed to me in a job interview.

This intriguing question originated from Testing of Core Sands topic in section Sand Reclamation & Control Test of Casting-Forming-Welding II

Answer 1

The correct answer is (a) Increases

To explain: With an increase in the volume of air passed, there is an increase in the permeable number, since the two have a direct relation.