Question Bank • QB_SUB_APE_0231 NAT • 2 Marks

Section 6: Agricultural Process Engineering

Material Handling: Belt, Screw & Bucket Conveyors

Subtopic: Centrifugal vs gravity discharge in bucket elevator

Question Statement:

A horizontal screw conveyor of diameter $D = 0.30\text{ m}$ and pitch $p = 0.30\text{ m}$ rotates at $60\text{ rpm}$. Taking shaft diameter as negligible and loading efficiency as $\phi = 0.40$, the theoretical volumetric conveying capacity (in $\text{m}^3\text{/h}$, rounded to 1 decimal place) is:

Answer Key:

30.5

Step-by-Step Solution & Explanation

Volumetric capacity: $Q = 60 \times \frac{\pi}{4} D^2 \times p \times N \times \phi = 60 \times \frac{\pi}{4} (0.3)^2 \times 0.3 \times 60 \times 0.40 = 30.54\text{ m}^3\text{/h}$
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