Question Bank • QB_APE_GATE_002 NAT • 2 Marks

Section 6: Agricultural Process Engineering

Engineering Properties of Agriculture Produce

Subtopic: Electrical properties

Question Statement:

A bulk grain sample has a bulk density of $750\text{ kg/m}^3$ and a true density of $1250\text{ kg/m}^3$. The porosity of the bulk grain mass is ________ $\%$ (in integer).

Answer Key:

40

Step-by-Step Solution & Explanation

Porosity: $\epsilon = \left(1 - \frac{\rho_b}{\rho_t}\right) \times 100 = \left(1 - \frac{750}{1250}\right) \times 100 = (1 - 0.60) \times 100 = 40\%$ Hence, the porosity is **40** $\%$.
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