If d=depth of cut in mm, f=feed in mm/stroke, n=stroke/min, l=length of stroke in mm, m= ratio of return stroke time to cutting stroke time, then find the formula for metal removal rate.

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1.	If d=depth of cut in mm, f=feed in mm/stroke, n=stroke/min, l=length of stroke in mm, m= ratio of return stroke time to cutting stroke time, then find the formula for metal removal rate.
A.	fdln(m+1)
B.	fdlnm
C.	fdlnm/1000
D.	none of the mentioned
Answer» B. fdlnm

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