The thickness of the blank needed to produce, by power spinning a missile cone of thickness $$1.5mm$$ and half cone angle $$30deg$$

Two shafts $$A$$ and $$B$$ have their diameters specified as $$100 \pm 0.1\,\,mm$$ and $$0.1 \pm 0.0001\,\,mm$$ respectively. Which of the following statements is/are true

In $$PTP$$ type of $$NC$$ system

A large uniform plate containing a rivet-hole is subjected to uniform uniaxial tension of 95 MPa. The maximum stress in the plate is