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In the band and block brake as shown in fig below, the band is lined with 12 blocks each of which subtends an angle of 15° at the center of the rotating drum. The thickness of block is 75 mm and diameter of drum is 850 mm. When the brake is in action, the greatest and least tensions in the brake strap are T1 and T2, then derive the relation of ratio between tensions. Also calculate the least force required at C for the block to absorb 250kW at 260 rpm. The coefficient of friction for brake is 0.4. All dimensions are in mm.
See lessFor a close-coiled helical spring subjected to an axial load of 300N having 12 active number of coils of wire diameter of 16 mm, and made with mean coil diameter of 250 mm, find axial deflection, strain energy stored, maximum torsional shear stress in the wire and maximum shear stress using Wahl’s correction factor.
See lessA steel plate 100 mm wide and 10 mm thick is joined with another steel plate by means of single transverse and double parallel fillet weld as shown in figure below. The strength of the plates to be joined is equal to strength of welded joint. The permissible tensile and shear stress for weld and plate material are 70 MPa and 50 MPa, respectively. Find the length of each parallel fillet weld.
See lessA double riveted double cover butt joint is made of 12mm thick plates. By considering suitable rivet diameter (use Unwin’s formula) for this joint find the efficiency of joint. Also draw the sketch of the riveted joint. Take shear and crushing strength for rivet material as 80 MPa and 160 MPa and tearing strength of plate material is 115 MPa. (pmax = 3.5t+ 41.28 mm)
See lessProve that the ratio of belt tension is given by the T1/T2 = e^μθ
A differential band brake is shown in Figure. The diameter of the drum is 800 mm. The coefficient of friction between the band and the drum is 0.3 and the angle of embrace is 240°. When a force of 600 N is applied at the free end of the lever, find for the clockwise rotation: a) The maximum and minimum forces in the band b) The torque which can be applied by the brake
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