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By which type of coal does briquettes are made?

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in Engineering Chemistry II by (789k points)
By which type of coal does briquettes are made?

(a) High grade fuel

(b) Ultra high grade coal

(c) Low grade fuel

(d) High grade coal

The question was asked by my college professor while I was bunking the class.

My question is taken from Secondary Solid Fuels in division Fuels and Combustion of Engineering Chemistry II

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Best answer
The correct option is (c) Low grade fuel

Best explanation: Briquettes are made by compressing low grade coal with or without binder (5-8% of coal tar or molasses). It helps us to utilize small-sized waste coal produced in mining and hence likely to be an important method as the best coal seems to get depleted.

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