Question

5. Multiple choices: The morphology shows that the material fails due to (a) static load, (b) Fatigue load. (2pts) 6. For a helical spring, curvature factor and shear stress correction factor depend only on the geometry of the spring not the strength of the wire. True_ False__. (2pts) 7. The pitch of the body coil can be calculated from the number of active coils and the critical length of the spring. True_ False__. (2pts) 8. Zimmerli data may be determined from the tensile strength of the material for making the spring. True_ False__. (2pts) 9. The torsional strength of a music wire may not be related to the tensile strength of the material for drawing the wire. True_ False__. (2pts) 10. In design of mechanical spring, the higher the absolute value of the figure of merit the lower of the cost of the spring. True_ False__. (2pts) 11. The natural frequency of a spring can be reduced by reducing the weight of the wire. True_ False__. (2pts) 12. For both shaft design and spring design, the running frequency should be at least two times lower than the first mode of natural frequency. True_ False__. (2pts) 13. Considering the contact fatigue of a gear, the wear factor should be higher than the gear factor. True_ False__. (2pts) 14. The Sines method and Zimmerli data were only applicable for torsional stress analysis. True_ False__. (2pts) 15. The analytical formula shown is for finding the member stiffness. True_ False__. (2pts) km/Ed = A exp(Bd/l) (8-23) 16. A conical frustum is symmetrically distributed about the interface of the two members to be joined. True_ False. (2pts) 17. The stresses in a powered screw include: ______________________________. (2pts) 18. The major stress in a spring comes from the direct shear. True_ False__. (2pts)

          5. Multiple choices: The morphology shows that the material fails due to (a) static load, (b) Fatigue load. (2pts)


6. For a helical spring, curvature factor and shear stress correction factor depend only on the geometry of the spring not the strength of the wire. True_ False__. (2pts)
7. The pitch of the body coil can be calculated from the number of active coils and the critical length of the spring. True_ False__. (2pts)
8. Zimmerli data may be determined from the tensile strength of the material for making the spring. True_ False__. (2pts)
9. The torsional strength of a music wire may not be related to the tensile strength of the material for drawing the wire. True_ False__. (2pts)
10. In design of mechanical spring, the higher the absolute value of the figure of merit the lower of the cost of the spring. True_ False__. (2pts)
11. The natural frequency of a spring can be reduced by reducing the weight of the wire. True_ False__. (2pts)
12. For both shaft design and spring design, the running frequency should be at least two times lower than the first mode of natural frequency. True_ False__. (2pts)
13. Considering the contact fatigue of a gear, the wear factor should be higher than the gear factor. True_ False__. (2pts)
14. The Sines method and Zimmerli data were only applicable for torsional stress analysis. True_ False__. (2pts)
15. The analytical formula shown is for finding the member stiffness. True_ False__. (2pts)
km/Ed = A exp(Bd/l) (8-23)
16. A conical frustum is symmetrically distributed about the interface of the two members to be joined. True_ False__. (2pts)
17. The stresses in a powered screw include:
________________________________. (2pts)
18. The major stress in a spring comes from the direct shear. True_ False__. (2pts)

5. Multiple choices: The morphology shows that the material fails due to (a) static load, (b) Fatigue load. (2pts)

6. For a helical spring, curvature factor and shear stress correction factor depend only on the geometry of the spring not the strength of the wire. True False. (2pts)
7. The pitch of the body coil can be calculated from the number of active coils and the critical length of the spring. True False. (2pts)
8. Zimmerli data may be determined from the tensile strength of the material for making the spring. True False. (2pts)
9. The torsional strength of a music wire may not be related to the tensile strength of the material for drawing the wire. True False. (2pts)
10. In design of mechanical spring, the higher the absolute value of the figure of merit the lower of the cost of the spring. True False. (2pts)
11. The natural frequency of a spring can be reduced by reducing the weight of the wire. True False. (2pts)
12. For both shaft design and spring design, the running frequency should be at least two times lower than the first mode of natural frequency. True False. (2pts)
13. Considering the contact fatigue of a gear, the wear factor should be higher than the gear factor. True False. (2pts)
14. The Sines method and Zimmerli data were only applicable for torsional stress analysis. True False. (2pts)
15. The analytical formula shown is for finding the member stiffness. True False. (2pts)
km/Ed = A exp(Bd/l) (8-23)
16. A conical frustum is symmetrically distributed about the interface of the two members to be joined. True False. (2pts)
17. The stresses in a powered screw include:
. (2pts)
18. The major stress in a spring comes from the direct shear. True False. (2pts)

Added by Tamara C.

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