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In orthogonal turning of a low carbon steel bar of diameter 150mm with uncoated carbide tool, the cutting velocity is 90m/min. the feed is 0.24mm/rev and the depth of cut is 2mm. The chip thickness obtained is 0.48mm. if the orthogonal rake angle is zero, and the principle cutting edge angle is 90, the shear angle is 90, the shear angle in degrees is

(a) 20.56                                            (b) 26.56

(c) 3056                                              (d) 36.56

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