railway RRB JE (CBT I + CBT II) Mock Test 2024 Production Engineering (Manufacturing) Machining Processes and Machine Tools Different Machining Processes
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)
1
8 s
2
16 s
3
4 s
4
0.33 s