1. A steel beam, of rectangular cross-section 75mm wide by 150mm deep, has a length of 3.0m and is simply supported at its ends. What will be the maximum bending stress when the beam is subject to a concentrated load of 20kN at the midspan Analyze the effect on maximum bending stress if the width of the beam is increased. (Ans:53.33MPa) 2. A steel bar whose uniform cross-section is square of side 100mm is used as a beam simply supported at its ends with a span of 2m. If it carries a concentrated load of 8kN at mid span, neglecting the mass of the beam find the maximum stress due to bending over the cross-section 3. A beam simply supported at its ends, has a uniform rectangular cross-section of 100mm wide and 230mm deep. The span of the beam is 8m. Find the maximum concentrated load which can be carried at mid span if the maximum stress due to bending is 80MN/m2. Neglect the mass of the beam (Ans: 35.3kN ) 4. A cantilever of rectangular cross-section 74mm wide and 110mm deep carries a concentrated load of 3kN at its free end. Neglecting the mass of the cantilever, find the maximum length if the permissible stress due to bending is not to exceed 85MN/m2. (Ans : 4.23m )