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A: Hand forging operation applied to gold is called as black smithy. Answer: False
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- In a bolted joint two members are connected with an axial tightening force of 2200 N. If the bolt used has metric threads of 4 mm pitch, the torque required for achieving the tightening force isA spur gear transmits 35 N · m of torque to the 20-mm-diameter driveshaft. The 5-mm-diameter setscrew threads onto the gear’s hub, and it is received in a small hole that is machined in the shaft. What's the factor of safety aganist yield under shear loadingthick lnange be! The total torque required to turn the double threaded power screw is 55 N.m. If the screw turns at 285 rpm and the pitch of 4mm, find: A. The horsepower input of the power screw. B. The efficiency if the weight loaded is 10 kN.
- The corediameter of the double start square threaded screw having a pitch of 12mm is 50 mm. A load of 18kN is lifted through a distance of 180mm. Find the work done(in Joule)in lifting the loadand the efficiency of the screw, when 1. The load rotates with the screw, and 2. The load rests on the loose head which does not rotate with the screw. The external and internal diameter of the bearing surface of the loose head are 60 mm and 10 mmrespectively. The coefficient of friction for the screw is 0.11,whilefor the bearing surface is 0.13.Steel rod AB bonded to the brass rod BCD as shown below. The steel rod has a diameter of 50 mm while the brass rod has an outer diameter of 40mm with segment BC being hollow with an inner diameter of 20 mm. If the assembly is loaded as shown, solve for the a. magnitude of the internal torque in the steel section (TAB) b. maximum shear stress in the steel section (TAB) C. maximum shear stress developed in the whole assembly (Tmax) 0.60 kNm A 1.80 kNm 2.0m 2.0m 2.0m4.) A flat belt makes contact with an 16 in. diameter pulley through half its circumference. If the coefficient of friction is 0.45 , and a torque of300ft−bsis to be transmitted, calculate the belt tensions. (please type answer not write by hend)
- Question 2 A aluminium wheel of diameter 200 mm carries a load of 800 N.If 200 N force required at center to roll the wheel. calculate the coefficient of rolling friction.A flanged bolt coupling has ten (10) steel 25.4 mm diameter boltsevenly tighten around a 415 mm bolt circle. Determine the torquecapacity of the connection if the allowable shearing stress inthe bolt is 50 MN/m21. A jack having square threads of 50 mm nominal diameter and 10 mm pitch is supporting a load of 89 kN. A double thread is used and the coefficient of friction maybe as low as 0.10 or as high as 0.15.a. Will this screw always self-locking?b. What is the highest torque necessary to raise the load?c. What maximum torque is necessary to lower the load?d. What is the maximum torsional shear stress induced on the screw?
- CB Page view A Read aloud Add text V Draw Highlight A 550 rpm shaft fitted with a 35 inches diameter pulley weighing 300 lbs. This pulley delivers 40 Hp to a load. The shaft is also fitted with a 26 inches pitch diameter gear weighing 220 lb. This gear delivers 30 Hp to a load. Assume that the tension of the tight side of the belt is twice that on the slack side of the belt, determine the concentrated loads produced on the shaft by the gear in Ibs. Select one: a. 753.85 b. 462.61 C. 484.44*** d. 264.44Two parts of a machine, both made from steel, are held together by 7 equally-spaced M6 x 1.0 grade 8.8 bolts that are uniformly tightened to provide a total initial clamping force of 60 kN. What wrench torque is required to set the preload on these bolts? Assume a torque factor of 0.18 in your calculations. Express your answer in units of newton meters to a resolution of 0.1 N-m.8. Design a clamp coupling for transmitting 25 kW at 300 rpm. Allowable shear stresses in shaft and key are 50 MPa and 45 MPa, respectively. The number of bolts joining the two halves of muff is 4. The permissible tensile stress in the bolt is 70 MPa and the permissible crushing stress in the key is 90 MPa. The coeffi cient of friction between the muff of the CI and the shaft of steel is 0.20.