Question

What is the level of fineness to be achieved in crushed coal?

(a) 10-20%

(b) 25-40%

(c) 50-60%

(d) 70-80%

This question was addressed to me in an interview for internship.

This question is from Cements, Metallurgical Coke and Synthetic Resins topic in chapter Miscellaneous Materials of Engineering Material & Metallurgy

Answer 1

The correct answer is (d) 70-80%

To elaborate: The coal, after being washed, is blended to form a uniform configuration. This allows even low-grade coal to be used in operations. The blended mix is crushed to achieve a fine quality of 70-80% below a 3 mm mesh.