The cutting force and the approximate value of torque at a spindle run of 120 r.p.m. will respectively be

Question

A lathe consumes 500 W when running idle and 2500 W when cutting a steel specimen at 30 m/min. If the depth of cut is 4mm and feed rate is 0.25         mm/rev, the cutting force and the approximate value of torque at a spindle run of 120 r.p.m. will respectively be                                          

         (a) 4000 N and 160 N-m

         (b) 3000 N and 160 N – m

         (c) 4000 N and 100 N – m

         (d) 3000 N and 100 N – m