Question

If weight of rammer is W, free fall height is h, number of layers is N, number of blows is n, acceleration due to gravity is g and volume as V, then the formula for energy per volume is ______

(a) \(\frac{WhNng}{V} \)

(b) \(\frac{WVNng}{h} \)

(c) \(\frac{Whng}{N} \)

(d) \(\frac{WgN}{hnV} \)

I had been asked this question in an interview for internship.

Origin of the question is The Dietert, Abbot Compaction Test and Jodhpur Mini Compactor Test topic in portion Compaction of Geotechnical Engineering I

Answer 1

The correct answer is (a) \(\frac{WhNng}{V} \)

Easy explanation: The energy per volume formula is given by,

\(\frac{WhNng}{V}, \)

where, W = weight of rammer

h = free fall height

N = number of layers

n = number of blows

g = acceleration due to gravity

V = volume.

The units of energy per volume is kJ/m^3.