PRIME REVIEW ONLINE MACHINE DESIGN & SHOP PRACTICE Ct eee RY SHAFTINGS Determine the torque that can be applied to a 1 in diameter circular shaft ifthe shearing stress is not to exceed 8000 psi A. 1570 in-b B. 2750in-Ib 1750 in-lb D. 3560 in-Ib A steel shaft is subjected to a constant torque of 2260 N-m. The ultimate strength and_ yield strength of the shafting material are 668 MPa and 400 MPa respectively. Assume a factor of safety 2 based on the yield point and endurance strength in shear, determine the diameter of the shaft in inches. A152 1.915 in B. 2.321in D.2.417 in What would be the diameter in millimeters of @ main power transmitting steel shaft SAE 1040 to transmit 150 kW at 900 rpm? A. 23 6.26 B. 66.4 D.765 A solid steel shaft having a diameter of 3 in twists through an angle of S deg in 20 ft of length because ofthe action of a torque. Determine the maximum shearing stress in the shaft. ‘A. 3550 psi 4550 B, 6550 psi D. 8550 ps Determine the angular deflection in degrees of a SAE 1040 steel shaft in a length of % meter. The shear stress is 69 MPa, shaft diameter is 62 mm and steel modulus of elasticity is 79.3 GPa, A. 0.08 €.0.01 B Ot D.08 ‘The maximum torque that can be applied to a hollow circular steel shaft of 120 mm outside diameter and 80 mm inside diameter without exceeding a shearing stress of 80 MPa is: A. 18.46 KN-m 36.24 KN-m B. 42.83 KN-m D.21.78 KN-m Ahollow shaft with outside diameter of 14 cm and wall thickness of 0.8 cm transmits 200 kW at 400 rpm. What must be the angular deflection of the shaft ifthe length is 5 meters? Take G=12,000,000 psi A.0.019 deg. 1.14 deg €.1.94 deg D.2.44 deg 8 Determine the thickness of a hollow shaft having an outside diameter of 100 mm if tis subjected to a maximum torque of 5,403.58 N-m without exceeding a shearing stress of 60 MPa or a twist of 0.5 degree per meter length of shaft. G=83000 MPa. A. 15mm B. 168mm. 30mm D.14.2mm 9. A round steel shaft to a torque 200 rpm and is, subjected to a torque of 226 Nm. The allowable shearing stress 41.4 MPa. It is also subjected to a bending moment of 339 N-m. The allowable tensile stress if 55 MPa. Find the diameter. A. 37mm 41mm B. 45mm D.51mm 10. The shaft of a 50 hp 850 rpm electric motor is 31 in from center to center of bearings and 2.5 in. in diameter. If the magnetic pull on the armature is 1500 Ib concentrated midway between the bearings, determine the maximum shear and the ‘maximum tensile stress in the shaft. ‘A.3.98 ksi and 7.76 ksi B.1.54ksi and 7.76 ksi €.3.98 ksi and 6.87 ksi D.2.54 ksi and 5.49 ksi 11, A solid transmission shaftis 3.5 inches in diameter. Itis desired to replace it with a hollow shaft of the same material and same torsional strength but its weight should only be half as much as the solid shaft. Find the outside and inside diameter of the hollow shaft in millimeters. A. 107.315:mm ; 86.97 mm B. 120.217 mm ; 65.97 mm C 112.231 mm ;84.60 mm D. 181.204 mm ; 54.30 mm 12.476 mm solid shaft is to be replaced with a hollow shaft of equal torsional strength. The outside diameter of the hollow shaft is 100 mm. Find the inside diameter of hollow shaft and percentage of weight saved. A. 56.53% €.67.31% B. 48.49% D.72.50% 13.A 20 ft lineshaft has no bending action except its ‘own weight. What power in HP can the shaft deliver at a speed of 360 rpm. Consider that the torsional deflection will not exceed 0.08/ft length. A. 100 €.120 B. 5S D.135 14. 20 ft lineshaft has bending action except its own weight. What power in HP can the shaft deliver at a speed of 360 rpm. Consider that the torsional deflection will not exceed 0.08/ft length. A. 2600 1100 B. 1250 D.9001 © IME REVIEW ONLINE KEYS AND COUPLING ‘A4 inches shaft using a flat key whose width is 1 inch is transmitting a torque of 63000 inl. I the design shearing stress is 5000 psi, the safe length is A. 63in B. 4.3in C.53in D. None of these 41200 mm cast iron pulley is fastened to a 112.50 mm shaft by means of a 28.13 mm square key 175 mm long. What force acting at the pulley rim will shear the key if shear stress of the key is 20.67 kg/mm??, A. 9538 kg B, 5839 kg C8593 kg D. 3859 kg, Aline shaft with a power of 100 kW at a speed of 1200 rpm, had a rectangular key used in its pulley connection. Consider the shearing stress of the shaft to be 40 MPa and the key to be 200 MPa, determine the width of the rectangular key if itis one fourth of the shaft diameter. A, 23.65 mm 14.65 mm, B. 11.65mm D.9.65 min A solid steel machine shaft with a safe shearing stress of 7000 psi transmits a torque of 10500 in- Ib, Asquare key is used whose width is equal to one fourth the shaft diameter and whose length is equal to 1% times the shaft diameter. Find key dimensions. A. Yein and 3 in B. %inand25in . Bin and 2.5 in D.%inand 3in ‘Two shafts are connected by a flange coupling. The coupling is secured by 6 bolts, 20.mm in diameter on a pitch circle diameter of 150 mmm. If torque of 120 N-m is applied, find the shear stress in the bolts. ‘A. 0.85 N/mm2 B. 0.85 Pa 0.85 kPa D.0.95 Pa A flanged coupling has an outside diameter of 200 mm and connects two 40 mm shafts. There are four 16 mm bolts on a 140 mm bolt circle. The radial flanged thickness is 20 mm. If the torsional stress in the shaft is not to exceed 26 MPa, determine the shear stress in the bolts ifuniformly distributed. A. 12Mpa B. 4.3Mpa .29MPa D.5.8 Mpa ‘Two short shafts having identical diameters of 38.1 mm and rotating at 400 rpm are connected by a flange coupling having 4 bolts with a 100 mm bolt circle. The design shearing stress of the bolt is 12 Mpa and design compressive stress of the flange is 15 Mpa. How thick should the flange be in mm? MACHINE DESIGN & SHOP PRACTICE A. 151mm B. 12.49 mm. 13.60 mm D.15.65mm. 8. A flange coupling is to be designed, using 25-mm diameter bolts at a distance of 152 mm from the center of the shaft. Allowable shearing stress on the bolt is 103 MPa. Ifthe shaft is to transmit 5800 hp at a speed of 1200 rpm, how many bolts are needed. A 2 C3 Ba DS COLUMNS L.A steel piston rod in hydraulic cylinder is 1 in diameter and 2 ft length, Assume E =30 x 10° psi Using Euler’s equation, find the slendemess ratio and the maximum load that stod can take in compression. Assume both ends of the rods are hinged, A. 25,232.97 Ib C. $6,322.97 Ib B, 52,322.97 Ib D. 25,653.97 Ib Please log-on to www primereviewcenter,com for the enhancement of Elements(Terms) in Mathematics & Basic Engineering Sciences, Power & Industrial Plant Engineering and Machine Design Ten FRR TDC GRP BELRADARQUEITEERUGIV TUNG. SA CHTE AVILA Red GUTHLDG CDE R PNAS LONULASE SAIC HONIATE NPR