BSi

Question 1

Projection line

Answer 1

Continuous thin line for projecting between views.

Question 1

Outline solid

Answer 1

Continuous thick line for visible edges and outlines.

Question 2

Hidden detail line

Answer 2

Dashed thin line for hidden detail.

Question 3

Centre line

Answer 3

Long dash — dot chain line for centres of symmetry.

Long dash — short dash chain is also acceptable.

Used to show the centre of shapes, for example a circle. Can be abbreviated to CL.

Question 4

Fold line

Answer 4

A thin double-dash chain line to indicate folds on surface developments.

Question 5

Cutting plane

Answer 5

Continuous thin line for projecting between views. Shows where an object has been cut or sectioned.

Question 6

Leader line

Answer 6

Narrow lines which lead from points on a view to the arrowhead dimension lines. A small gap should be left between the view and the leader line.

Question 7

Common tolerance

Answer 7

The Common method shows the upper limit of the size placed above the lower limit.

Question 8

Asymmetrical tolerance

Answer 8

The
Asymmetrical
method shows the nominal size plus the upper and lower limits of the tolerance.

Question 9

Symmetrical tolerance

Answer 9

The Symmetrical method shows the nominal size and the symmetrical tolerance expressed as a plus and minus.

Question 10

Functional tolerance

Answer 10

A dimension that is essential to the function of a component or space.

Question 11

Non-functional tolerance

Answer 11

A dimension that is not essential to the function of a component or space.

Question 12

Projected edge

Answer 12

To select an edge from a CAD model or feature and generate it as a new line in a sketch.

Question 13

Fixed

Answer 13

To hold a 3D CAD model in a fixed point, without applying any constraints.
Usually applied to the first component in an assembly.

Question 14

Irregular fillet

Answer 14

A rounding of an edge, where the radius will change.

Question 15

Irregular chamfer

Answer 15

The removal of an edge by a cut, where the distance changes along the length of the edge.

Question 16

Intersect

Answer 16

Two 3D CAD features that pass through one another, with the result that only the area that the two touch remains. Everything else is deleted.

Question 17

Datum

Answer 17

A key point in which dimensions, sizes and other details are taken from.

Question 18

Sub-assembly

Answer 18

An assembly of components that is added to another, larger assembly.

Question 19

Suppress

Answer 19

To turn a feature or command off within the modelling tree.

Question 20

Wire frame

Answer 20

A method of presenting a 3D CAD model, showing only the edges. Faces are transparent.

Question 21

Modelling tree

Answer 21

The linear hierarchy of how a 3D CAD model is created or assembled.

Question 22

Sited environment

Answer 22

An environment that represents how the 3D CAD model would look in a realistic environment.

Question 23

STEP/IGES

Answer 23

STEP and IGES files are a method of sharing 3D CAD components and assemblies between CAD platforms. Widely used for stock or library components.

Question 24

Combined Dimensioning

Answer 24

Combined Dimensioning is a combination of parallel and Chain Dimensioning that can be used when space is very limited or the drawing is complex.

Question 25

Hatching line

Answer 25

A 45 degree line which shows the surface produced by a cutting plane.

Question 26

Dimension line

Answer 26

Indicates the size of a edge or face.

Question 27

Types of building drawings

Answer 27

Location Plans Site Plans Floor Plans Elevations Sectional Views

Question 28

Location (block) plan

Answer 28

The location plan identifies the location of the building or construction site in relation to its surroundings. It also helps the builders to plan the layout of the building.

Question 29

Location plans include:

Answer 29

All neighbouring buildings and their plot boundaries Street names Roads, pavements, footpaths etc. A north direction arrow The scale of the drawing.

Question 30

Location plan scale

Answer 30

1:1250

Question 31

Site plan

Answer 31

Site plans show the site boundary and the outline of the proposed development. Site plans show a larger view of a plot, normally highlighted in the location plan. The builder needs to know exactly where the plot of the building is to be constructed.

Question 32

Site plans include:

Answer 32

Boundaries of the plot The position of the building within the plot Access paths Trees Drainage information; pipe runs, manholes etc. Contour lines, indicating the slope of the ground A north direction arrow The scale of the drawing

Question 33

Site plan scale:

Answer 33

1:200

Question 34

Floor plan

Answer 34

The floor plan is an internal view of a house from above. It is used by all trades to plan their work. It allows us to see the arrangement of the rooms, the position of windows and doors as well as the thickness of internal and external walls etc. It gives information to trades people (builders, joiners, electricians, plumbers) but also used to show the client or customer the layout and dimensions of the house before it is built.

Question 35

Floor plans include:

Answer 35

The layout and dimensions of rooms Positions and sizes of windows and doors. Layout of the kitchen and bathroom fixtures and fittings Lamps, switches, sockets etc. The scale of the drawing

Question 36

Floor plan scale

Answer 36

1:100 or 1:50

Question 37

Elevations

Answer 37

Elevations are orthographic views of the outside of the building that enable clients and customers to see what the finished building will look like.

Question 38

Elevations include:

Answer 38

The style of the building The external proportions of the building The external features of the building; windows styles and wall finishes. The type of roof The position of the doors and windows from the outside.

Question 39

Elevation scale

Answer 39

1:100 or 1:50

Question 40

Sectional views

Answer 40

Sectional views are detailed technical drawings showing a slide through a wall. The section is normally taken through a part of the building that will show most detail. A cross section through the side of a building gives builders, joiners and roofers all the information about how the building should be constructed. For example, details like the choice of materials, the design of the foundations and how all the different parts fit together should all be shown on this type of view

Question 41

Sectional views include

Answer 41

The materials used: brick, timber, concrete etc. Construction details. Dimensions The scale of the drawing.

Question 42

Sectional view/section scale

Answer 42

1:20

Question 43

Illustrations

Answer 43

Rendered illustrations promote the house and give potential buyer an idea of what it will look like when it’s complete. The aim is to make the image look realistic and attractive to clients; this can be done by creating a pleasant surrounding. These illustrations are easier for the public to understand as there are no technical graphics to over complicate them. Nowadays, technology has advanced to allow 3D animation ‘walk through’ videos, to give an even clearer representation of a building.

Question 44

Schematic drawings

Answer 44

Heating engineers, electricians and plumbers all work from drawings called schematic diagrams. They are used to present complex 3D installations in an easy to read 2D format.