1. An engine running at 150 rpm drives a line shaft by means of a belt. The engine pulley is 750 mm diameter and the pulley on the line shaft is 450 mm. A 900 mm diameter pulley on the line shaft...

Extracted text: 1. An engine running at 150 rpm drives a line shaft by means of a belt. The engine pulley is 750 mm diameter and the pulley on the line shaft is 450 mm. A 900 mm diameter pulley on the line shaft drives a 150 mm diameter pulley keyed to a dynamo shaft. Find the speed of dynamo shaft, when: 1. There is no slip, 2. There is a slip of 2% at each drive. 150 L 900 ( 3 ) ( 4 ) 750 Dynamo Shaft (1 ) ( 2 ) Line Shaft Engine Shaft 450 2. A leather belt 9 mm x 250 mm is used to drive a cast iron pulley 900 mm in diameter at 336 rpm. If the active arc on the smaller pulley is 120° and the stress in tight side is 2 MPa, find the power capacity of the belt. The density of leather may be taken as 980 kg/m*, and the coefficient of friction of leather on cast iron is 0.35.? 3. A flat belt is required to transmit 30 kW from a pulley of 1.5 m effective diameter running at 300 rpm. The angle of contact is spread over 11/24 of the circumference. The coefficient of friction between the belt and pulley surface is 0.3. Determine, taking centrifugal tension into account, width of the belt required. It is given that the belt thickness is 9.5 mm, density of its material is 1100 kg/m3 and the related permissible working stress is 2.5 MPa. 4. Determine the size of a rubber belt to drive a dynamo generating 20 kW at 2250 rpm. and fitted with a pulley 200 mm diameter. Assume dynamo efficiency to be 85%. Allowable stress for belt = 2.1 MPa Density of rubber = 1000 kg/m3 Angle of contact for dynamo pulley = 165° Coefficient of friction between belt and pulley = 0. Determine (a) minimum number of passes required, and (b) draft for each pass?