Allied & ICAR Exam Bank • ALLIED_1267 NAT • 2 Marks

Section 6: Agricultural Process Engineering

Material Handling Equipment

Subtopic: Bucket Elevators

Question Statement:

A vertical bucket elevator has buckets of capacity 2.0 litres spaced 0.30 m apart along a belt running at $1.5\text{ m/s}$. The grain bulk density is $750\text{ kg/m}^3$. Assuming a bucket filling efficiency of 80%, the mass conveying rate in tonnes per hour is:

Answer Key:

21.6

Step-by-Step Solution & Explanation

Bucket discharge frequency $= \frac{v}{s} = \frac{1.5\text{ m/s}}{0.30\text{ m}} = 5\text{ buckets/s}$. Volume delivered $= 5 \times (2.0\text{ L} \times 0.80) = 8.0\text{ L/s} = 0.008\text{ m}^3/\text{s}$. Mass flow rate $= 0.008 \times 750 = 6.0\text{ kg/s}$. In tonnes/h: Capacity $= \frac{6.0 \times 3600}{1000} = 21.6\text{ t/h}$.
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