Engineering Drawings and Scales Quiz

Drawing Types and Scales

• Engineering drawings are typically generated using computer-aided design (CAD) systems.
• Scale on drawings indicates the ratio between the drawing size and the actual size of the object.
• A scale of 1:10 means that an object 100mm long in real life would measure 10mm on the drawing.
• General Arrangement (GA) drawings provide an overview of entire devices or structures at a small scale (e.g., 1:100 for a building).
• Detail drawings focus on specific components with larger scales, often at actual size (1:1) or even larger (e.g., 2:1), for detailed representation.
• Schematic drawings are used for electrical circuits and pipe/ductwork, providing simplified representations of these systems.

Types of Views Used on Drawings

• Plan view shows an object from above, displaying its arrangement.
• Section view provides a cut-through perspective revealing the internal structure of a component.
• Elevations present multiple views of an object from different sides, showcasing its overall form.
• Exploded view displays an assembly with components spaced out, demonstrating the relationships between parts for assembly and maintenance.

2D vs. 3D Views

• Two-dimensional (2D) views, including plans, sections, and elevations, can make it difficult to understand complex assemblies.
• Three-dimensional (3D) views, employing oblique or isometric projections, offer a more comprehensive understanding of complex assemblies.