Section A 1. If we calculate the moment of a force about a specific point, we will get a moment vector that has a with respect to the plane containing the force and moment arm. direction 2. For a particle in 3D, how many equations of equilibrium can we write? a) 2 b)3 c) 6 d) 9 3. Force vector F = 80i + 50k passes through point (0,3,0). What is the magnitude of moment that this force creates about direction axis i + k? a) 240 b) 150 c)-90 d) 106 4. When studying frictional forces on screws, we know that the screw is said to be in self-locking when a) 0> op b) 8< q c) 8 = 4 d) Not possible to say without numeric values 5. Let's say we try to solve the member forces of a space truss which is loaded by 3 known external forces. After solving support forces, we end up in a situation where we know all support forces. Then we notice that our truss has 12 members and 5 joints. Which of the following is true? a) we are unable to solve the problem since we don't have enough equations b) we are unable to solve the problem since we have too many equations c) we are able to solve the problem since we have just the right amount of equations d) we are able to solve the problem and also check the solutions since we have extra equations 6. If we use SI unit system, what is the unit of strain? 7. An aluminum (elastic modulus 70 GPa, yield strength 194 MPa) rod that is 155 mm long is loaded by an axial force P. As a result, the rod elongates 0.2 mm. What is the magnitude of axial stress in the rod? a) 2.8 MPa b) 90.3 MPa c) 38.8 MPa d) can't calculate stress using only this information 8. When are we allowed to ignore stress concentrations? a) material is brittle and loading is static b) material is brittle and loading varies a lot c) material is ductile and loading is static d) material is ductile and loading varies a lot 9. We have a beam with a T-shaped cross-section (neutral axis also illustrated). Shear stress in the cross-section of the beam will be at maximum in point a) A b) B c) C d) D N A C 10. If our material is regular structural steel and we want to maximize safety, the stress hypothesis that we should choose is a) Tresca b) von Mises c) Maximum normal stress criterion d) Mohr's criterion
Section A 1. If we calculate the moment of a force about a specific point, we will get a moment vector that has a with respect to the plane containing the force and moment arm. direction 2. For a particle in 3D, how many equations of equilibrium can we write? a) 2 b)3 c) 6 d) 9 3. Force vector F = 80i + 50k passes through point (0,3,0). What is the magnitude of moment that this force creates about direction axis i + k? a) 240 b) 150 c)-90 d) 106 4. When studying frictional forces on screws, we know that the screw is said to be in self-locking when a) 0> op b) 8< q c) 8 = 4 d) Not possible to say without numeric values 5. Let's say we try to solve the member forces of a space truss which is loaded by 3 known external forces. After solving support forces, we end up in a situation where we know all support forces. Then we notice that our truss has 12 members and 5 joints. Which of the following is true? a) we are unable to solve the problem since we don't have enough equations b) we are unable to solve the problem since we have too many equations c) we are able to solve the problem since we have just the right amount of equations d) we are able to solve the problem and also check the solutions since we have extra equations 6. If we use SI unit system, what is the unit of strain? 7. An aluminum (elastic modulus 70 GPa, yield strength 194 MPa) rod that is 155 mm long is loaded by an axial force P. As a result, the rod elongates 0.2 mm. What is the magnitude of axial stress in the rod? a) 2.8 MPa b) 90.3 MPa c) 38.8 MPa d) can't calculate stress using only this information 8. When are we allowed to ignore stress concentrations? a) material is brittle and loading is static b) material is brittle and loading varies a lot c) material is ductile and loading is static d) material is ductile and loading varies a lot 9. We have a beam with a T-shaped cross-section (neutral axis also illustrated). Shear stress in the cross-section of the beam will be at maximum in point a) A b) B c) C d) D N A C 10. If our material is regular structural steel and we want to maximize safety, the stress hypothesis that we should choose is a) Tresca b) von Mises c) Maximum normal stress criterion d) Mohr's criterion
Elements Of Electromagnetics
7th Edition
ISBN:9780190698614
Author:Sadiku, Matthew N. O.
Publisher:Sadiku, Matthew N. O.
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