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(i) What is the significance of (1) angle of nip, and (2) angle of bite during rolling operation?

        How are they related to roll friction?                                                                          10

      (ii) Classify the process of extrusion with the help of sketches. Enumerate the conditions under which central burst may occur. Where does a 'pipe' occur?                                                                        15

      (iii) What is "friction hill"?

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