Q.1. A flat belt (Polyamide A-3 belt with 10 inch width) is used to reduce speed from 900 RPM to 300 RPM and connects two shafts on 14-ft centers with diameter of small pulley = 18 in. Design HP = 60. Find actual coefficient of friction. (12) Q.3 An Oiles SP 500 alloy brass bushing is 1 in long and 1 in bore and operates in a clean environment of 70° F. The allowable wear without the loss of function is 0.005 in. The radial load is 700 lbf and the peripheral velocity is 33 ft/min. Estimate the number of revolutions for radial wear to be 0.005. (6) Q.4. The pinion passes 20 hp at 2500 rpm. The train ration is 3.5:1. The pinion has 17 teeth, a pressure angle of 20 degrees, and diametral pitch=6. Use face width of 2 inches to find stress in pinion if overload, size and rim thickness factors are all 1. (10) gears Q.2. The gear forces developed in a power transmission system using helical is shown in Fig. 1. Draw required shear force and bending moment diagrams for this system. Bearings are angular contact ball bearings. (12) See Fig. 1 Ay A== 351 lbs 132,lbs K3 Ax 94,lbs 4.141" Fig. 1 4. D