Technical Drawings Revision Quiz

Which of the following best describes an orthographic projection?

• A 3D drawing showing an object from a single angle

• A method of representing a 3D object using several 2D views, usually front, plan, and side

• A drawing that shows an object as if it has been exploded into its components

• A freehand sketch of an object

Answer explanation

An orthographic projection represents a 3D object through multiple 2D views, typically including the front, top, and side. This method allows for accurate dimensions and relationships between different views.

Which of the following is NOT a typical view shown in an orthographic projection?

• Front view

• Plan view

• Side view

• Perspective view

Answer explanation

A perspective view represents depth and realism, unlike orthographic projections, which show multiple views (front, plan, side) without depth. Therefore, perspective view is NOT a typical view in orthographic projection.

What is the main advantage of using CAD software for technical drawings?

• It is always free to use

• It allows for easy editing and accurate measurements

• It requires no training

• It produces only hand-drawn sketches

Answer explanation

The main advantage of CAD software is that it allows for easy editing and accurate measurements, making it more efficient than traditional methods. This enhances precision and saves time in creating technical drawings.

In an exploded view drawing, what is the main purpose?

• To show the object in a realistic 3D form

• To illustrate how the parts of an assembly fit together

• To show only the external appearance

• To provide a single flat view

What is the main difference between first angle and third angle projection in orthographic drawings?

• The number of views used

• The position of the views relative to each other

• The use of colour

• The scale of the drawing

Answer explanation

The main difference between first angle and third angle projection lies in the position of the views. In first angle projection, the views are arranged differently compared to third angle projection, affecting how they relate to each other.

Which of the following best describes an isometric drawing?

• A 3D representation

• A 2D drawing showing only the front view

• A drawing using only circles and arcs

Answer explanation

An isometric drawing is a 3D representation where the three dimensions are shown in a single view, allowing for a clear depiction of the object's shape and structure. This distinguishes it from 2D drawings or specific shapes.

In CAD software, which tool is typically used to add text annotations to a drawing?

• Dimension tool

• Text tool

• Line tool

• Array tool

Answer explanation

The Text tool is specifically designed for adding text annotations in CAD software, making it the correct choice. The other tools serve different purposes, such as creating dimensions, lines, or arrays.

What is the main benefit of using layers in CAD drawings?

• To make the drawing look colourful

• To organise different elements and control their visibility

• To increase the file size

• To print the drawing in black and white

Answer explanation

The main benefit of using layers in CAD drawings is to organise different elements and control their visibility, allowing for better management and clarity in complex designs.

Which of the following would you expect to see in an exploded view of a bicycle?

• The bicycle as a single, complete object

• Each part separated and spaced out, showing how they fit together

• Only the wheels

• Only the frame

Answer explanation

An exploded view of a bicycle shows each part separated and spaced out, illustrating how they fit together. This allows for a clear understanding of the assembly and components, unlike a complete object or just parts like wheels or frame.