§-Quick questions
NSWEngineering StudiesPreliminary Module: Lifting Devices
Quick questions on Hydraulic lifting and Pascal's principle: HSC Engineering Studies Lifting Devices
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 is a hydraulic circuit?Show answer
A complete hydraulic lifting circuit has:
What is hydraulic excavator example?Show answer
A 20-tonne excavator (Caterpillar 320, Komatsu PC200, Hitachi ZX200) uses three main hydraulic cylinders: boom, stick (arm), and bucket. Working pressure is about 30 MPa (300 bar). Bucket curl forces of 100 kN and breakout forces of 130 kN are produced by 130 mm bore cylinders. Hydraulic systems on construction equipment dominate this duty class because they pack high power density (about 1 kW per kg of cylinder, versus 0.3 kW per kg for an equivalent electric motor and gearbox).
What is safety in lifting?Show answer
Hydraulic lifting is governed by AS1418 (lifts and hoists). Critical safety items:
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