Skip to main content

← back to the guide

HSC Engineering Studies: forces, materials and machines quiz

14questions. Pick an answer and you'll see why right away.

  1. Which two equations express static equilibrium in two dimensions, in addition to the sum of moments being zero?

  2. A uniformly distributed load of 4 kN/m acts over the full 6 m span of a beam. For calculating reactions, this is replaced by a single resultant force of what magnitude and where?

  3. A steel bar of area 250 mm2250\,\text{mm}^2 carries a tensile load of 5050 kN. What is the stress?

  4. In the method of joints for a pin-jointed truss, a member force comes out negative when you assumed tension. What does this mean?

  5. Why is concrete reinforced with steel bars?

  6. For an ideal pulley system, the ideal mechanical advantage equals the velocity ratio and equals which quantity?

  7. A block and tackle with 4 supporting segments lifts a load at 80 percent efficiency. What is the actual mechanical advantage?

  8. Two gear stages of 4:1 and 5:1 are connected in series. What is the overall gear ratio?

  9. A hoist drum of radius 0.20 m experiences an actual torque of 850 N m. What rope force can it produce?

  10. A hydraulic jack has an input piston of diameter 20 mm and an output piston of diameter 100 mm. By what factor is the input force multiplied?

  11. A crane hoist rope has a minimum breaking load of 215 kN and AS1418 requires a factor of safety of 5. What is the safe working load?

  12. Why does a worm-gear hoist still require a separate mechanical brake under AS1418, even though it is self-locking?

  13. In steady level flight, which equilibrium relationship between the four forces of flight holds?

  14. Young's modulus is read from which part of the stress-strain curve?