📚 Year 10 OCR Engineering: Unit Test Mock Paper Walkthrough | 十年级 OCR 工程：单元测试模拟卷解析
Welcome to this detailed walkthrough of a mock unit test for Year 10 OCR Engineering. This article breaks down typical exam-style questions, covering materials, manufacturing, mechanics, electronics, engineering design, and sustainability. Each section provides a model answer with clear explanations, paired in both English and Chinese to support your revision. Use this guide to understand key concepts and common pitfalls before your actual test.
欢迎阅读这篇针对十年级 OCR 工程单元测试模拟卷的详细解析。本文分解了典型的考试题型，涵盖材料、制造、力学、电子、工程设计以及可持续性。每个部分都提供了模型答案和清晰的解释，并配有中英双语对照，以辅助你的复习。请利用本指南，在正式考试前掌握关键概念和常见易错点。
1. Material Properties and Selection | 材料性能与选择
A bracket for an outdoor solar panel must be lightweight and resistant to weathering. Aluminium alloy 6082 is recommended because its density of 2.70 g/cm³ is low, reducing the structural load. The formation of a natural aluminium oxide layer protects against corrosion without the need for paint. If higher tensile strength were essential, 7075 alloy could be chosen, but it is more expensive and harder to weld.
一个用于户外太阳能板的支架必须轻便且耐候。推荐使用6082铝合金，因为其密度低（2.70 g/cm³），可减轻结构负荷。天然形成的氧化铝层无需涂漆即可防止腐蚀。如果必须有更高的抗拉强度，可以选择7075合金，但它更贵且更难焊接。
Engineers also evaluate yield strength. For 6082-T6, the yield strength is about 250 MPa, whereas the tensile strength is around 300 MPa. Yield strength is more critical here because the bracket must not permanently deform under wind or snow loads. When comparing materials, use a strength-to-weight ratio chart to find the optimum.
工程师还会评估屈服强度。对于6082-T6，屈服强度约为250 MPa，抗拉强度约为300 MPa。此处屈服强度更为关键，因为支架在风荷载或雪荷载下不得发生永久变形。在比较材料时，可使用比强度图表来找到最佳选择。
2. Manufacturing Processes | 制造工艺
This question asks you to compare casting and forging. Casting involves pouring molten metal into a mould and letting it solidify. It can create complex internal shapes, making it ideal for engine cylinder blocks. However, cast parts may contain porosity and have lower toughness. Forging, on the other hand, compresses hot metal under high pressure, aligning the grain flow to increase fatigue strength. A forged crankshaft is an excellent example of a part that benefits from this directional strength.
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Published by TutorHao | Year 10 工程 Revision Series | aleveler.com
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