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(i) Describe the properties of tungsten carbide as a cutting tool material and its applications.                                

(ii) In orthogonal machining, prove that

Where, rc = chip thickness ratio

a = back rake angle

f = shear angle                                                                                                       

(iii) Explain ‘sudden-death mechanism’ of tool failure.                                               

(iv) What are extreme-pressure lubricant?                                                                     

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