Discussion
Arrange the causal chain by which briquetting makes a residue usable at a distance:
1. Loose residue has a very low bulk density
2. A lorry reaches its volume limit long before its weight limit
3. Compaction raises the density several fold
4. Transport cost per tonne falls and distant use becomes viable
Select the correct sequence.
Answer: B
Correct answer: 1, 2, 3, 4
The chain runs from a physical property to an economic outcome. Loose residue has a very low bulk density (1), so a lorry reaches its volume limit long before its weight limit (2) and carries only a fraction of the tonnage it could.
Compaction raises the density several fold (3) - for husk, from about 100 to 650 kg/m\(^3\) - so the same lorry now carries several times the mass. Transport cost per tonne falls accordingly and distant use becomes viable (4). The briquetting energy is the price paid for that.
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