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STRENGTH OF MATERIALS Practice Exam Direction: Solve the following Problems. Right minus wrong! NO CHEATING ALLOWED! 1. Steel rails 10 m long are laid with a clearance of 3 mm at a temperature of 15°C. Use α = 11.7 x 10^-6 per degree centigrade and modulus of elasticity of steel is 200000 MPa. Determine the temperature of steel so that rails will just touch. a. 31.55°C b. 40.44°C c. 40.64°C d. 38.57°C 2. A cubical section has E = 200000 MPa and Poissons ratio = 0.30. Determine the compressive stress acting on each side of its faces if the volume of the cube is reduced by 0.15%. a. 275 MPa b. 315 c. 250 d. 200 3. A thin-walled cylinder shell has an internal diameter of 2 m is fabricated from plates 20 mm thick. Which of the following gives the ratio of the hoop stresses over the longitudinal stress of the cylinder? a. 2 b. 10 c. 1 d. 3 4. A cantilever beam, 60 mm wide by 200 mm high and 6 m long, carries a load that varies uniformly from zero at the free end to 1000 N/m at the wall. Calculate the maximum flexural stress. a. 20 MPa b. 15 c. 18 d. 22.5 SITUATION 1: A rigid plate of negligible mass rests on a central spring which is 20 mm higher than the symmetrically located ...
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