A tractor has belt speed of 1000 m/min at normal engine speed. A feed mill has a recommended speed of 2100 rev/min. Find the size of pulley, needed on the Feed mill.

(a) 14.28 cm

(b) 12.14 cm

(c) 19.11 cm

(d) 15.16 cm

This question was addressed to me in unit test.

This interesting question is from Numerical Problems on Calculation of Different Tractor Parameters in portion Lubrication System and Tractor’s Classification of Farm Machinery