§-Engineering Q&A
QLD · QCAA← Engineering
Engineering Q&A by dot point
A short Q&A bank for every QLD Engineering syllabus dot point. Each question and answer is drawn directly from our worked dot-point page, so you can scan key concepts before opening the long-form answer.
Unit 3: Civil structures
Determine the shear force and bending moment at points along a simply supported beam under point and distributed loads, and relate maximum bending moment to the risk of structural failure
Apply the factor of safety to relate the maximum (failure) stress of a material to the allowable working stress, and select or verify a member size against the expected load
Apply the conditions of static equilibrium to determine unknown forces acting on a structure, using free-body diagrams and the resolution of forces into perpendicular components
Identify and quantify the dead, live and environmental loads acting on a civil structure and combine them to find the total design load on a structural element
Define and compare the mechanical properties of engineering materials, including strength, stiffness, ductility, hardness and toughness, and justify a material selection for a structural application
Describe the standard destructive and non-destructive tests used to measure tensile strength, hardness, impact toughness and other mechanical properties, and interpret the data they produce
Calculate the moment of a force about a point and apply moment equilibrium together with force equilibrium to determine the support reactions of a simply supported structure
Calculate stress, strain and Young's modulus for a material under axial load, and interpret the elastic region, proportional limit and Hooke's law from a stress-strain diagram
Interpret a stress-strain diagram to identify the proportional limit, yield point, ultimate tensile strength and fracture, and distinguish elastic from plastic behaviour and ductile from brittle materials
Analyse a statically determinate pin-jointed truss using the method of joints to find the magnitude and nature (tension or compression) of the force in each member
Classify civil structures by form and load path, and explain how the choice of structural form responds to the function, site and social or environmental context of a project
Unit 4: Machines and mechanisms
Calculate the speed ratio of a belt or chain drive from the pulley or sprocket diameters, and compare belt and chain drives for slip, distance and load capacity
Explain how a cam and follower converts rotary motion into a programmed reciprocating or oscillating motion, and interpret the displacement diagram that describes the follower's movement
Apply the engineering problem-solving process to a machine or mechanism brief, explaining how data, prototyping and evaluation against criteria drive the development of a justified solution
Calculate the gear ratio, output speed and output torque of a simple and a compound gear train, and explain how gears trade rotational speed against torque
Analyse the three classes of lever using the principle of moments, and identify how simple machines such as levers, pulleys, wheel-and-axle and inclined planes provide mechanical advantage
Explain how linkages and the four-bar mechanism transmit and change motion, identify common linkage types, and analyse the motion they produce from their geometry
Describe machine control using the input-process-output model, distinguish open-loop from closed-loop (feedback) control, and identify the role of sensors, controllers and actuators
Calculate mechanical advantage, velocity ratio and efficiency for simple machines such as levers, pulley systems and inclined planes, and explain the trade-off between force and distance
Calculate torque as the turning effect of a force, and relate torque and rotational speed to mechanical power transmitted by a rotating shaft
Classify the four types of motion (linear, rotary, reciprocating and oscillating) and explain how mechanisms convert between them in real machines