What is an orthographic projection?

• A technique for creating 3D models using color gradients.

• A method of drawing 2D shapes with curved lines.

• A way to project images onto a screen using light.

• A method of representing 3D objects in 2D using parallel lines for accurate dimensions.

Define isometric projection.

• Isometric projection involves scaling the axes differently to create depth.

• Isometric projection is a method of creating 3D models using perspective techniques.

• Isometric projection is a type of perspective projection where the vanishing points are at infinity.

• Isometric projection is a type of axonometric projection where the three axes are equally scaled and the angles between them are 120 degrees.

How many views are typically shown in orthographic drawings?

• Four views

• Five views

• Three views

• Two views

What is the main purpose of using orthographic projections?

• To provide a clear and accurate representation of an object in two dimensions.

• To simplify complex shapes into basic geometric forms.

• To enhance the color and texture of an object in design.

• To create three-dimensional models of objects.

In isometric drawings, what angle do the axes make with each other?

• 90 degrees

• 180 degrees

• 45 degrees

• 120 degrees

What is the difference between first-angle and third-angle projection?

• First-angle projection is a method for 3D modeling, while third-angle projection is for 2D drawings.

• First-angle projection shows views on the opposite side of the object, while third-angle projection shows views on the same side as the object.

• First-angle projection is used in Europe, while third-angle projection is used in the United States.

• First-angle projection shows views on the same side as the object, while third-angle projection shows views on the opposite side.

Why are isometric drawings useful in engineering?

• Isometric drawings are only useful for architectural designs.

• Isometric drawings are not effective for communicating design ideas.

• Isometric drawings are primarily used for creating 2D floor plans.

• For visualizing and communicating complex three-dimensional designs clearly and accurately.

What are the three principal views in orthographic projection?

• Front view, bottom view, back view

• Top view, left view, isometric view

• Side view, rear view, perspective view

• Front view, top view, side view

Explain the term 'hidden lines' in orthographic projection.

• Hidden lines are dashed lines used in orthographic projection to indicate edges not visible from the current viewpoint.

• Hidden lines are used to indicate dimensions in orthographic projection.

• Hidden lines are colored lines that show the surface texture of an object.

• Hidden lines are solid lines used to represent visible edges.

What is the significance of scale in orthographic and isometric drawings?

• Scale is irrelevant for accurate measurements.

• Scale is used solely for aesthetic purposes in drawings.

• Scale ensures accurate representation and measurement of dimensions in orthographic and isometric drawings.

• Scale is only important in isometric drawings.