To become familiar with and apply the concepts of maximum sustainable torque and power to solid and hollow circular shafts. A solid circular shaft and a tubular shaft, both with the same outer radius of c=co = 13.0 mm, are being considered for a particular design. The tubular shaft has an inner radius of ci = 8.00 mm. The shafts are to be powered by a motor operating at a frequency of f = 3.00 Hz and are to handle an attached load. Assume the cross-sections are uniform throughout the lengths of the shafts and that the materials have allowable shear stress of τallow = 96.0 MPa.   PART A: Determine the maximum sustainable torque that the solid shaft can handle.   PART B: Determine the maximum sustainable torque that the tubular shaft can handle.   PART C: Determine the maximum sustainable power that the solid circular shaft can handle without failing.   PART D: Determine the maximum sustainable power that the tubular circular shaft can handle without failing.

(5) Given from a generator: Full-load rating of generator Full-load efficiency of generator : 90% Speed Frequency EMF 70mme 70mm : 37.5MW -16 x M42 bolts :3,600rpm : 60HZ ©300mm 480mm 580mm : 13kV From the given data, determine the following: (a) Power transmitted by the coupling; (b) Torque developed in kg-m; (c) Load in the bolts in N; (d) Shearing stress in each bolt; (e) Bearing pressure in each bolt; Turbine Rotor shaft Generator Rotor shaft

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• HOME WORK Design the elliptical cross-section of a belt pulley arm near the hub for the following specifications: The mean pulley diameter is (300 mm) and the (number of pulley arms are 4). The elliptical section has major axis twice the minor axis length. The tight and slack sides tension in the belt are (600 N and 200 N) respectively. Assume half number of arms transmit torque at any time and the load factor of 1.75 to account for dynamic effects on the pulley while transmitting torque. The permissible tensile stress for cast iron pulley material is 15 MPa. The pulley hub diameter is 60 mm. [Ans. a=40 mm, b₁= 20 mm]