A single point right handed turning tool is used for straight turning. The feed is $$0.25$$ $$mm/rev$$ and the uncut chip thickness is found to be $$0.25$$ $$mm.$$ The inclination angle of the main cutting edge is $${10^ \circ }.$$ The back rake angle (in degrees) is ________________

Built-up edge formation decreases under the conditions listed below EXCEPT

During turning of mild steel work material, the maximum temperature is observed at

The angle of a twist drill that determines its rake angle is