Strength of Materials Assessment Welcome, You are about to take up the Strength of Materials Assessment. Please take note of the following before you take the assessment. This assessment is timed for 60 Mins and auto submit. Scores and correct answer will be displayed after taking up the assessment. You can only take the assessment twice so make sure you have a strong internet connection. All questions are required to have an answer. This assessment is composed of 10 items multiple choice type of question. Always remember: THINK, CHECK AND SUBMIT. If you have any concern, please feel free to contact us. E-mail Address: assessment@flightwingsaviation.com Facebook Page: www.facebook.com/flightwingsaviation GOODLUCK! Email Adress LMS USERNAME FULL NAME CLASS SECTION/SCHEDULE (FRI-AM, FRI-PM, SAT-AM, SAT-PM, SUN-AM, SUN-PM, ONLINE) 1. It is the stress at which failure occurs. A. Ultimate StressB. Yield PointC. Rupture stressD. None of the above A B C D None 2. The steel propeller shaft ABCD carries the axial loads shown in Fig. (a). Determine the change in the length of the shaft caused by these loads. Use E = 29×106 psi for steel.A. Elongation = 0.014 inB. Elongation = 0.2 inC. Elongation = 0.88 ftD. None of the above A B C D None 3. The concrete post in Fig. (a) is reinforced axially with four symmetrically placed steel bars, each of cross-sectional area 900 mm2. Compute the stress in each material when the 1000-kN axial load is applied. The moduli of elasticity are 200 GPA for steel and 14 GPA for concrete. A B C D None 4. A solid steel shaft in a rolling mill transmits 20 kW of power at 2 Hz (Hertz). Determine the smallest safe diameter of the shaft if the shear stress is not to exceed 40 MPa and the angle of twist θ is limited to 6° in a length of 3 m. Use G = 83 GPa. A. d = 58.7 mmB. d = 58.7 inC. d = 68.5 mmD. d = 68.5 m A B C D None 5. It is built into a rigid support at one end, with the other end being free. It is one of the type of beams. A. Howe truss B. I-Beam C. H-Beam D. Cantilever beam A B C D None 6. The applied force is perpendicular to the resisting area A. Strain B. Ultimate stress C. Normal Stress D. All the above A B C D None 7. For the truss shown in Figure, calculate the stresses in member DF. The cross-sectional area of each member is 1.8 in2. Indicate tension (T) or compression (C). A. DF = 2000 psi (T)B. DF = 25000 psi (C)C. DF = 18500 psi (C)D. None of the above A B C D None 8. Shearing stress is also known as A. Tangential StressB. Stress acting perpendicular to the areaC. All the aboveD. None of the above A B C D None 9. The members of the structure in Figure weigh 200 lb/ft. Determine the smallest diameter pin that can be used at A if the shearing stress is limited to 5000 psi. Assume single shear. A. D = 0.0024 inB. D = 4 inC. D = 0.520 inD. None of the above A B C D None 10. Calculate the minimum wall thickness for a cylindrical vessel that is to carry a gas at a pressure of 1400 psi. The diameter of the vessel is 2 ft, and the stress is limited to 12 ksi. A. t = 1.4 inB. t = 2.8 inC. t = 2 inD. None of the above A B C D None 1 out of 1
