A coal having high ratio of volatile matter to fixed carbon as compared to a coal having low ratio of volatile matter to fixed carbon _________________?
Correct answer: B. None of these
- A. Is less liable to spontaneous combustion on storage
- B. None of these
- C. Requires smaller combustion space and less secondary air
- D. Is more difficult to ignite and produces a shorter flame
Explanation
A high volatile-matter-to-fixed-carbon ratio makes coal easier to ignite and gives a longer flame, while also increasing its tendency to spontaneous combustion. It generally needs more combustion space and secondary air, so none of statements a to c is correct.
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