Discussion
A screw conveyor of \( 0.25 \) m diameter with a full pitch runs at \( 60 \) rev/min at a loading factor of \( 0.35 \) and a bulk density of \( 700 \) kg/m\(^3\). Its capacity is
Answer: B
The swept volume per revolution is \( (\pi/4)(0.25)^2 \times 0.25 = 0.01227 \) m\(^3\), which at 60 rev/min gives \( 44.2 \) m\(^3\) an hour. At 35 per cent loading that is \( 15.5 \) m\(^3\), and multiplying by 700 kg/m\(^3\) gives about 10.8 tonnes an hour.
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