3 Drawings (2365 Unit 203)

1. What type of diagram shows how a circuit is wired in practice?

• Schematic diagram

• Block diagram

• Wiring diagram

• Bar chart/Gantt chart

• Architectural plan

Answer explanation

Wiring diagrams

A wiring diagram shows how a circuit is actually wired in practice. This may result in a diagram that makes it harder to understand how the circuit functions. An example wiring diagram is shown below:

2. What type of diagram shows the position accessories in an installation?

• Bar chart/Gantt chart

• Wiring diagram

• Block diagram

• Architectural plan

• Schematic diagram

Answer explanation

Architectural plans including as fitted drawings

These are the types of drawing most likely to be encountered by installation electricians. They show the layout of the building and the position of accessories and equipment, using standard symbols.

3. What type of diagram allows a contractor to plan the sequence of work?

• Bar chart/Gantt chart

• Schematic diagram

• Block diagram

• Wiring diagram

Answer explanation

Bar charts

Bar charts can be used for many purposes, but the most common use is in planning the sequence of works; this can be represented graphically by bar charts, as shown:

4. What type of diagram better shows how a circuit works rather than how it is wired?

• Schematic diagram

• Wiring diagram

• Bar Chart/Gantt chart

• Block diagram

• Circuit diagram

Answer explanation

Circuit diagrams

A circuit diagram is the representation of a circuit arrangement that permits easier understanding of how the circuit works. In practice, the actual wiring may be different to the circuit diagram. An example of a circuit diagram is shown below:

5. What type of diagram better shows how a system works?

• Schematic diagram

• Wiring diagram

• Bar Chart/Gantt chart

• Block diagram

• Circuit diagram

Answer explanation

Schematic diagrams

These are very similar to circuit diagrams in that they show how a system works rather than how it is wired. They are generally used on larger control systems, as they can make fault-finding much simpler. An example is shown:

6. What type of diagram shows the sequence of equipment?

• Schematic diagram

• Wiring diagram

• Bar Chart/Gantt chart

• Block diagram

• Circuit diagram

Answer explanation

Block diagrams

A block diagram does not show individual conductors or cables but the sequence of equipment instead. For example, the diagram below shows the supply sequence to an installation: