Why ball and race mill is also called as contact mill?(a) Because of rolling action between the balls and races(b) Because of ramming action between balls and races(c) Because of swirling action of balls and races(d) Because of mixture of balls and racesThis question was addressed to me in my homework.My question comes from Pulverised Mills topic in portion Steam Power Plant of Energy Engineering

Why ball and race mill is also called as contact mill?(a) Because of r

1.	Why ball and race mill is also called as contact mill?(a) Because of rolling action between the balls and races(b) Because of ramming action between balls and races(c) Because of swirling action of balls and races(d) Because of mixture of balls and racesThis question was addressed to me in my homework.My question comes from Pulverised Mills topic in portion Steam Power Plant of Energy Engineering
Answer» The correct option is (a) Because of rolling action between the balls and races Explanation: The pulverization or crushing action in ball and race mill TAKES between the two moving surfaces called balls and races. The rolling action happens between these two. Then the COAL passes between the rotating elements TIME and again until it has been pulverized to the desired DEGREE of fineness.

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