Discussion
A screw conveyor consuming \( 8.5 \) kW moves \( 25 \) t/h. Its specific energy is
Answer: B
Correct answer: 0.34 kWh per tonne
Divide the power drawn by the throughput:
\[ \frac{8.5\ \mathrm{kW}}{25\ \mathrm{t/h}} = 0.34\ \mathrm{kWh\ per\ tonne} \]
Expressing energy this way makes machines of different size and duty comparable. A screw conveyor's figure is characteristically high for the distance covered, because the material is dragged against the trough throughout - which is the practical reason screws are used for short runs and belts for long ones.
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