Question 1: Explain what is meant by 'isometric drawing' and how it differs from other types of drawing projections.

Answer: Isometric drawing is a method of representing three-dimensional objects on a two-dimensional surface where the three axes are equally angled at 120 degrees. Unlike perspective drawing, it does not include vanishing points, and the scale remains consistent along all axes.

Question 2: Describe the main features of an isometric grid and explain how it helps in drawing objects.

Answer: An isometric grid consists of a series of equally spaced lines at 30 degrees to the horizontal, forming a network of diamonds. It provides a guide for maintaining consistent angles and proportions when drawing in isometric projection.

Question 3: Sketch a simple cube in isometric projection, ensuring all edges are correctly aligned and proportioned.

Answer: A correct sketch will show a cube with all sides and edges in proper isometric perspective, with parallel lines at 30 degrees, and the shape should appear three-dimensional and proportionate.

Question 4: Draw a basic chair in isometric view. Include a seat, four legs, and a backrest.

Answer: The sketch should depict a simple chair with a rectangular seat, four legs extending downward, and a backrest at the rear, all drawn with edges aligned to isometric axes for a consistent 3D appearance.

Question 5: Identify three advantages of using isometric drawing in product design.

Answer: Advantages include: it accurately represents dimensions without distortion, allows clear visualization of complex objects, and is straightforward to construct with a grid, making it ideal for technical drawings and prototypes.

Question 6: What are the key differences between isometric and oblique drawing methods?

Answer: Isometric drawing uses a 30-degree angle with equal scale along all axes, providing a true three-dimensional view, whereas oblique drawing projects one face frontally and the other features at an angle, often with distorted proportions.

Question 7: Sketch a simple mechanical gear in isometric projection, focusing on the shape and tooth pattern.

Answer: A correct sketch should show a cylindrical gear with evenly spaced teeth around the circumference, drawn in isometric perspective, with all features proportionally accurate.

Question 8: Explain why isometric drawing is useful in engineering and manufacturing.

Answer: It provides a clear, accurate representation of complex parts, makes measurements straightforward, and allows designers to visualize assemblies in three dimensions without perspective distortion.

Question 9: Design a simple house structure using isometric drawing. Include walls, roof, and a door.

Answer: The house should be represented with rectangular walls, a pitched roof at the correct angles, and a door on one side, all aligned to the isometric axes for a coherent 3D effect.

Question 10: Sketch a keychain with a circular pendant hanging from a rectangular strap in isometric view.

Answer: The sketch should show the circular pendant and rectangular strap with proper isometric foreshortening, illustrating the 3D form clearly.

Question 11: List three common mistakes students make when drawing in isometric perspective and how to avoid them.

Answer: Common mistakes include: inconsistent line angles, incorrect proportions, and failing to keep parallel edges parallel. To avoid these, use an isometric grid, measure carefully, and check angles regularly.