The time required in drilling a 8 mm diameter hole through a 24 mm thi – McqOptions

MCQOPTIONS

1.	The time required in drilling a 8 mm diameter hole through a 24 mm thick mild steel plate with a drill bit running at 360 rpm and a feed of 0.5 mm per revolution is:(neglect the approach and over travel of drill)
A.	8 s
B.	16 s
C.	4 s
D.	0.33 s
Answer» B. 16 s

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