Question 1: Describe the key features of isometric drawing and explain why it is useful for designing objects.

Answer: Isometric drawing is a method where the object is drawn at 30 degrees to the horizontal, allowing three dimensions to be represented equally without distortion. It is useful for visualising objects clearly and accurately in 3D, which aids in design and manufacturing.

Question 2: Sketch a simple cube in isometric projection in the space provided. Make sure all edges are correctly aligned to the isometric axes.

Answer: A correct sketch should show a cube with all edges parallel to the three isometric axes, with the front face as a square, and the top and side faces as parallelograms, giving a 3D appearance.

Question 3: Identify three common mistakes when drawing in isometric view and explain how to avoid them.

Answer: Common mistakes include: (1) Drawing edges at incorrect angles (should be 30 degrees); (2) Not keeping all edges parallel to the isometric axes; (3) Incorrectly overlapping or misaligning faces. To avoid these, use a guide or grid, and check angles carefully.

Question 4: Draw a basic rectangular prism with a length of 60mm, width of 30mm, and height of 40mm in isometric view. Use a ruler if necessary and label the dimensions.

Answer: A proper drawing will depict a rectangular prism with edges aligned to the isometric axes, showing correct proportions. The length, width, and height should be clearly marked, with the edges correctly angled at 30 degrees.

Question 5: Explain how the isometric grid helps in creating accurate isometric drawings.

Answer: An isometric grid provides a set of guidelines at 30-degree angles, which helps in maintaining consistent angles and proportions, making it easier to draw 3D objects accurately.

Question 6: Sketch an object of your choice (e.g., a simple toolbox or a small chair) in isometric projection. Use the space provided and focus on clear, correct lines.

Answer: A good sketch will include the main shape of the object with all sides aligned to the isometric axes, showing depth and perspective. Details should be simplified but proportionate.

Question 7: List the three axes used in isometric drawing and describe how lines are drawn along each axis.

Answer: The three axes are: the vertical axis, and two axes slanting at 30 degrees to the horizontal—typically called the x, y, and z axes. Lines along these axes are drawn at consistent 30-degree angles to maintain the isometric perspective.

Question 8: Draw a small isometric view of a triangular-based prism. Include the base, the top face, and the sides, making sure the angles are correct.

Answer: The sketch should show a triangular base with sides aligned to the isometric axes, the top face parallel to the base, and straight connecting edges. The sides should be consistent in length and properly angled.

Question 9: Describe the difference between orthographic and isometric drawing in terms of object representation.

Answer: Orthographic drawing shows multiple views (front, side, top) with no perspective, focusing on accurate dimensions. Isometric drawing represents a 3D view of an object with all axes at 30 degrees, giving a clear sense of depth in a single view.

Question 10: Sketch a simple L-shaped bracket in isometric projection in the space provided. Make sure to include the correct angles and proportions.

Answer: A correct sketch will show the L-shape with two rectangular prisms joined at right angles, all edges aligned to the isometric axes, with accurate proportions and clear 3D appearance.

Question 11: Explain why isometric drawing is a useful skill for product designers and engineers.

Answer: Isometric drawing allows designers and engineers to visualise complex objects in three dimensions clearly and accurately, facilitating better understanding, communication, and planning before manufacturing.