railway RRB JE (CBT I + CBT II) Mock Test 2024 Production Engineering (Manufacturing) Machining Processes and Machine Tools
What will be step ratio of headstock spindle for a lathe machine of following data?
Maximum speed = 2100 rev/min
Minimum speed = 70 rev/min
No. of speeds = 211
(30)1/9
2
(30)1/20
3
(30)1/21
4
(30)1/22