Which of the following is a measure of the agglutinating (i.e., binding) property of coal ?
Correct answer: B. Caking index
- A. Thickness of plastic layer
- B. Caking index
- C. Swelling index
- D. Gray-king index
Explanation
The caking index directly indicates coal's tendency to soften and bind neighbouring particles during heating. Swelling and plastic-layer tests describe related behaviour, but caking index is the usual measure of agglutinating power.
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