Q5. A steel shaft 240mm outside diameter is 2 m long. The shaft is solid for 0.8 m of its length and hollow for the remainder, with an inside diameter of 160 mm. The shaft is fixed at both ends and a torque of 25 kNm is applied at the junction of the solid and hollow sections.
Calculate the maximum shear stress in the shaft material.
Q3. A Hartnell governor has three rotating balls each of mass 0.3 kg. The length of the ball arms arc 150 mm and the length of the sleeve arms are 100 mm. When at the mean speed of 480 rev/min and rising, the balls are at a radius of 110 mm. The governor spring stiffness is I 4 kN/m and friction at the sleeve is 50 N. Calculate EACH of the following:
(a) The spring compression al the mean speed;
(b) the vertical movement of the sleeve if the speed increases by 5%.
Q2. A short vertical hollow cylindrical column, 160 mm high and fixed at the base, is 70 mm outside diameter and 8 mm thick. It carries concentrated loads of 10 kN and 6 kN as shown in Fig Q6.
Calculate EACH of the following:
(a) The maximum compressive stress in the column;
(b) The maximum tensile stress in the column.
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