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SQA Higher Engineering Science Area 3 Mechanisms and structures overview quiz quiz

16questions. Pick an answer and you'll see why right away.

  1. Mechanical advantage is defined as

  2. A machine has a mechanical advantage of 3 and a velocity ratio of 4. What is its efficiency?

  3. A 15-tooth driver gear meshes with a 45-tooth driven gear. What is the gear ratio?

  4. In a belt drive, how does a larger driven pulley behave compared with a smaller driver pulley?

  5. Before using the power relationship P = T times omega for a rotating shaft, what must you do with a speed given in rev/min?

  6. A trolley is pulled with 30 N while 6 N of friction opposes it. What is the resultant force?

  7. A resultant force of 24 N acts on an 8 kg mass. What is the acceleration?

  8. Work done by a force is calculated as

  9. Which pair of conditions must both hold for a structure to be in static equilibrium?

  10. When finding beam reactions, why is it useful to take moments about a support?

  11. A 4 m beam is simply supported at each end with a 600 N load at its centre. What is each reaction?

  12. A structural member in tension, being stretched by the load, is called a

  13. A force F acts at angle theta to the horizontal. What is its vertical component?

  14. Stress in a loaded member is calculated as

  15. What does Young's modulus measure?

  16. A material fails at 300 MPa and a factor of safety of 5 is used. What is the safe working stress?