3. Spindle speed in a lathe for turning a 40 cm dia rod at a cutting speed of 30 m/min would be
A. 206 rpm
B. 238 rpm
C. 336 rpm
D. 100 rpm
3. Spindle speed in a lathe for turning a 40 cm dia rod at a cutting speed of 30 m/min would be
A. 206 rpm
B. 238 rpm
C. 336 rpm
D. 100 rpm