Engineering Drawings and Standards Quiz

Importance of Designations, Standards, and Abbreviations

• Engineering drawing abbreviations and symbols communicate and detail characteristics of drawings used in manufacturing and inspection.
• Technical standards provide glossaries of abbreviations, acronyms, and symbols.
• Drawing standards manuals establish conventions for engineering and drafting.
• These manuals set minimum requirements for drawings, ensuring standardization and uniform interpretation.
• System, Payload, or Component Assembly Definitions designate a unique identifier or reference for parts, components, or features.
• This includes a part number/code (alphanumeric), component name, material specifications, and drawing number.

Standards

• Standards develop, promote, and mandate compatible technologies and processes.
• Focus areas include quality, consistency, compatibility, interoperability, and safety.
• Standards normalize processes and technology.
• They establish rules, guidelines, and templates to ensure conformity and quality across activities.
• Abbreviations are standardized symbols, used in mechanical, electrical, piping, plumbing and civil/structural engineering drawings.
• Abbreviations save time, improve accuracy, clarify information, simplify complex information, and reduce costs. They ensure standardization across engineering industries.

Electronic Symbol System

• Different standards exist, like IEC 60617, and ANSI Y32/IEEE Std 315.
• These standards are used for creating circuit symbols, and ensure international compatibility.

Circuit Notation and Reference Designators

• Identifies components in circuit diagrams and schematics
• Cross-references with parts lists or Bills of Materials (BOMs)
• Aids in repair and troubleshooting of printed circuit boards
• Format uses letters and numbers (example R13, C45)
• Letters indicate component type. Numbers identify specific components.
• IEEE 200-1975 and ASME Y14.44-2008 are key standards for reference designations.

Circuit Layout/Design

• Circuit diagrams graphically represent electrical and electronic circuits; they simplify the circuit structure.
• Graphical representations of circuit elements (components and their connections) are standardized symbols.
• Electrical/Electronic diagrams are alternative names for a circuit diagram.
• Elementary diagrams are basic representations of circuit components.
• Electronic Schematics are tools used for circuit design.
• Designers use the diagrams to understand connections, not necessarily the physical positions of components.
• Design, construction, and maintenance are purposes of circuit diagrams used by electricians/engineers/technicians.

Drawing Circuit Diagram Tips

• Use accurate symbols for components.
• Draw lines neatly using straight lines (preferably with a ruler).
• Mark junctions with a 'blob'.
• Label components with their respective values.
• Label positive (+) and negative (-) terminals of the power supply.
• Use appropriate labels, specifications, and symbols.

Wiring and Cabling Diagram

• Wiring diagrams show physical relationships between electrical/electronic components, including connections.
• Diagrams use lines to represent connections.
• Types include continuous and interrupted lines connecting components
• Diagrams include labels for wire size/type, insulation type/color, and connection methods.

Electronic Packaging

• Electronic packaging protects electronic/electrical components from the environment and vice versa.
• This involves housing and interconnection of integrated circuits.
• Packaging protects equipment from electrostatic discharge, harmful environmental conditions, and heat.
• Various levels exist in electronic packaging, from "chip" to entire systems.
• Materials used in packaging include polymers, glasses, and various metals.

Standards (IPC, IEC, UL, ISO)

• Industry-specific standards help ensure consistency in design, assembly, and manufacturability for electronic components.
• Standards like IPC, IEC, UL, and ISO ensure safety, performance, environmental protection, electromagnetic compatibility, and quality through established design process rules.