9. 10. 11. 12. 13. Determine the torque received by the motor shaft running at 4250 rpm, transmitting 11 HP, through a 10 in diameter, 20 involute gear. The shaft is supported by ball bearings at both ends and the gear is fixed at the middle of 8 in shaft length. (ME Bd. Apr 97). Compute the nominal shear stress at the surface in MPa for a 40 mr diameter shaft that transmits 750 kw at 1500 rpm. Axial and bendin loads are assumed negligible. Torsional shearing stress is 28 n/mm. Design the size of solid steel shaft to be used for a 500 hp, 250 rpm application if the allowable torsional deflection is 1 and the allowable stress is 10,000 psi and modulus of rigidity is 13 x 106 psi. (ME Bd. Oct 95). A 76.2 mm diameter shafting of SAE 1040 grade, cold rolled, having a yield point of 50 ksi and with a 3/4 x 3/4 x 5 inches key. Compute the minimum yield point in the key in order to transmit the torque of the shaft. The factor of safety to use is 2 and Sys 0.5 Sy. (ME Bd. Oct 97). A rectangular key was used in a pulley connected to a lineshaft power of 125 kw at a speed of 900 rpm. If the shearing stress shaft is 40 N/mm and the key to be 22 N/mm. Determine the len the rectangular key if the width is one fourth that of the shaft dia (ME Bd. Apr 92). 14. 15. 16. A keyed sprocket deliver a torque of 778.8 N-m thru the shaft of 54 mm OD. The key thickness is 1.5875 cm and the width is 1.11 cm. Compute the length of the same key. The permissible stress value of 60 MPa for shear and 90 MPa for tension. (ME Bd. Oct 97). A flanged bolt coupling has ten (10) steel 25.4 mm diameter bolts evenly tighten around a 415 mm bolt circle. Determine the torque capacity of the connection if the allowable shearing stress in the bolt is 50 MN/m. (ME Bd. Oct 97). A flange coupling has an outside diameter of 200 mm and connects 40 mm shafts. There are four 16 mm bolts on a 140 mm bolt ci The radial flange thickness is 20 mm. If the torsional stress in the is not to exceed 26 MPa, determine the shearing stress in the bol uniformly distributed. (ME Bd. Oct 90).