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WalesDesign and TechnologyQuick questions
Unit 3 Technical Principles
Quick questions on Mechanical devices and movement - WJEC A-Level Design and Technology
3short Q&A pairs drawn directly from our worked dot-point answer. For full context and worked exam questions, read the parent dot-point page.
What are gears?Show answer
Gears are toothed wheels that mesh to transmit rotary motion. They change speed and torque and reverse direction between meshing gears. The gear ratio is the teeth on the driven gear divided by the teeth on the driver gear. A large driven gear turns slower but with more torque (a reduction); a small driven gear turns faster with less torque.
What is q1?Show answer
Name the type of motion produced when a cam and follower is driven by a rotating shaft. [1 mark]
What is q2?Show answer
A driver gear of 30 teeth meshes with a driven gear of 90 teeth. Calculate the gear ratio and state whether the output is faster or slower than the input. [2 marks]
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