Use the provided data wherever you need. Q1. A (25 kW, 500 rpm) motor has a mild steel shaft of (30 mm) diameter and (10 cm) length. There are two parallel keys available A (w = 12 mm, t = 10 mm) and B (w = 10 mm, t = 8 mm), suggest one of them to connect the shaft with a pulley. Power Torque Ductility (%) (Kw) Ultimate stress (Mpa) 640 Compression stress (Mpa) (Nm) Yield stress (Mpa) 400 Shear stress (Mpa) 160 1000 280 30 Modulus of Modulus of Bending Moment (Nm) Elasticity (GPa) Factor of Safety Rigidity (Gpa) 220 70 120 Fracture stress (Mpa) 250 Bending Stress (Mpa) 280

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Asphalt Binders and Mixtures

Asphalt binders are subsidiary products procured during the refining process of petroleum while manufacturing gasoline, diesel, and similar petroleum products. Asphalt binders are obtained from the residue that remains after the distillation of petroleum, this residue is further subjected to steam distillation and oxidation to remove the traces of gas oil present in the residue. Certain additives or modifiers are also added to asphalt binders to alter them to suit different applications.