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How does the friability of the coal is tested?

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How does the friability of the coal is tested?

(a) Drop shatter test

(b) Thermal cracking

(c) Knocking

(d) Proximate analysis

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I'm obligated to ask this question of Characteristics of Coal in portion Fuels and Combustion of Engineering Chemistry II

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Correct choice is (a) Drop shatter test

Explanation: Friability is the tendency of the coal to break into pieces. The more the friability, the less will be the quality of coal. Splint and cannel coal are less friable. Knocking is the unusual sound produced by an engine.

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