Q. 20 0.50 Unit For machining a rectangular island represented by coordinates P(0,0), Q(100,0), R(100,50) and S(0,50) on a casting using CNC milling machine, an end mill with a diameter of 16 mm is used. The trajectory of the cutter centre to machine the island PQRS is - (A) (-8, 8), (108, - 8), (108,58), (-8,58), (-8, -8) (B) (8, 8), (94, 8), (94, 44), (8, 44), (8, 8) (C) (-8,8), (94, 8), (94, 44), (8, 44), (-8,8) (D) (0, 0), (100, 0), (100, 50), (50, 0), (0, 0) Q. 24 The process of reheating the martensitic steel to reduce its brittleness without any significant loss in its hardness is (A) normalising (C) quenching (B) annealing (D) tempering