Q2 The armature shaft of a 40 kW, 720 rpm electric motor, mounted on two bearings A and B, is shown in below. The total magnetic pull on the armature is 10 N/mm and it can be assumed to be uniformly distributed over the length midway between the bearings. The shaft is made of steel with an ultimate tensile strength of 770 MPa and yield strength of 580 N/mm². Determine the shaft diameter. Assume the static stress concentration for step radii 3.5 in bending, 2 in torsion, and 6 for key way,hot rolled, pulley diameter 60mm, notch radius r=2.5 mm ,and safety factor 2.5. 150 700 10 N/mm d1 159 A d1 armature d2 r key 300 3000 N d1 pulley 1000 N

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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.