Discussion
Consider the following statements about briquetting:
1. It raises the bulk density of a loose residue.
2. It makes distant transport economic.
3. It raises the calorific value per kilogram substantially.
Which of the statements given above is or are correct?
Answer: C
Correct answer: 1 and 2 only
Statement 1 is correct: briquetting raises the bulk density several fold. Statement 2 is correct: because transport cost per tonne is governed by volume for a low-density material, that density increase is what makes distant use economic.
Statement 3 is false. The calorific value per kilogram is essentially unchanged, since compaction alters no chemistry. What rises is the energy per cubic metre - the same energy in less space, which is a quite different claim.
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