A steel bar 200 mm in diameter is turned at a feed of 0.25

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A steel bar 200 mm in diameter is turned at a feed of 0.25 mm/rev with a depth of cut of 4 mm. The rotational speed of the workpiece is 160 rpm. The material removal rate in mm³/s is

1. 160
2. 167.6
3. 1600
4. 1675.5

Correct Option: D

MRR = πDNd_f