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QLDEngineeringQuick questions
Unit 4: Machines and mechanisms
Quick questions on Linkages and four-bar mechanisms for QCE Engineering Unit 4
2short 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 is the four-bar linkage?Show answer
The four-bar linkage is the fundamental closed-loop linkage: four links joined in a loop, with one link fixed as the frame. The behaviour depends entirely on the relative link lengths:
What is the crank-slider?Show answer
The crank-slider replaces one pivoted link with a sliding block. A rotating crank drives a connecting rod, which pushes a slider back and forth in a straight track. This converts rotary motion into reciprocating linear motion (and the reverse), and it is the mechanism inside every piston engine, pump and compressor.
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