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(b) Casting, (c) Calendaring, (4) Rotational molding, 418. In which surface bridging are create, (a) Barrel, (b) Screw, (c) Hopper, (4) mold, 416, Mold opening stroke = 2Xmold hight+, (a) Product length, (b) Mold length, (c) Sprue length, (a) Product width, 17. Hydraulic clamping system is faster production rate than toggle clamping system. (true/, false), 18, Poly carbonate (PC) drying temperature rang is., (a) 100-120°C, (b) 70-80°C, (c) 260280°C (d), 300-310°C, 19. In injection mold, sprue, runner, &gate are called of mold., (a) Ejection system, (b) Guide system, (c) Feed system, (a) Non of these, 20. Cold slug well is the helps to easy flow of the main runner to sub runner. (true/false), 21. Antioxidant in prevent polymer oxidation reaction. (true/false), 22, PET material is amorphous material. (true/false), (a) Non of these, 23. General type of screw feed zone is 50% of the total screw. (true/false), 24. Flash is the defect where excessive material is found at locations where the mould, separates, notably the parting surface. (true! false), 25. Fish eyes are the defect of extrusion process. (true/ false)