Question 1: Describe what an orthographic projection is and why it is used in technical drawing.

Answer: An orthographic projection is a method of representing a three-dimensional object in two dimensions using multiple views, typically front, top, and side. It is used to clearly show all dimensions and details of an object for manufacturing or construction.

Question 2: Sketch the front view of a simple rectangular box with a width of 10cm, height of 8cm, and depth of 6cm. Ensure your sketch includes a clear outline.

Answer: A front view showing a rectangle measuring 10cm wide and 8cm high, with no visible depth (since depth is represented in other views). The sketch should be proportionate, with straight lines and clear boundaries.

Question 3: Draw the top view of the same rectangular box described above. Include the outline and label the width and depth.

Answer: A rectangle measuring 10cm wide and 6cm deep. The sketch should be proportionate, with labels indicating width and depth, and lines should be straight.

Question 4: Sketch the side view of the rectangular box. Show the height and depth, and label each dimension.

Answer: A rectangle showing the height of 8cm and depth of 6cm. The sketch should be proportionate, with clear labels for height and depth, and neat, straight lines.

Question 5: Explain the importance of using multiple views in orthographic drawing.

Answer: Multiple views allow a complete understanding of an object's shape and dimensions, making it easier to manufacture or construct accurately. They show different perspectives that a single view cannot convey.

Question 6: Imagine a simple L-shaped bracket. Describe the three main views you would draw in an orthographic projection, including key features.

Answer: The front view would show the height and width of the bracket, the top view would show the depth and width, and the side view would show the height and depth. Key features include the L shape, thickness, and any holes or cutouts.

Question 7: Draw an isometric sketch of a cube measuring 5cm on each side.

Answer: A 3D representation showing three faces of a cube with equal edges of 5cm, drawn with parallel lines at 30-degree angles to represent depth, giving a three-dimensional appearance.

Question 8: What are the main differences between an orthographic projection and an isometric drawing?

Answer: Orthographic projection shows multiple 2D views from different angles, while isometric drawing is a single 3D representation that shows all three dimensions in one view, with angles typically at 30 degrees.

Question 9: Sketch a simple design for a keychain in orthographic views. Include the front, top, and side views in your answer.

Answer: The front view might show a rectangular or circular shape with a hole for a keyring, the top view shows the outline shape, and the side view shows the thickness. All should be proportionate with clear labels.

Question 10: Identify and explain two common mistakes students make when drawing orthographic views.

Answer: Common mistakes include inaccurate proportions and lines that are not straight or parallel, which can distort the object's true shape and dimensions.