Question

The relationship between na, ac, and n is ____

(a) na=n*ac

(b) na=n/ac

(c) na=n+ac

(d) na=n-ac

This question was posed to me during a job interview.

This interesting question is from Functional Relationships in section Preliminary Definitions and Relationships of Geotechnical Engineering I

Answer 1

Right choice is (a) na=n*ac

Explanation: The percentage air voids is given by,

ac = \(\frac{V_a}{V_v}\)   and    n = \(\frac{V_v}{V}\)

na = \(\frac{V_a}{V}\) = n * ac.