railway DFCCIL Junior Executive 2023 (CBT 1 & CBT 2) Mock Test Fitter Tools Cutting Tools

Calculate the RPM for a high speed steel drill of Dia. 2 cm to cut mild steel. Consider the cutting speed for Mild steel as 31.4 m/min.

a) 500 RPM

b) 5000 RPM

c) 30 RPM

d) 300 RPM

1
a
2
b
3
c
4
d
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