CAD CAD Specialist Electrical and Electronics Design 3

Question 1

What does a 'single-line diagram' (SLD) represent in power system electrical CAD?

Accepted Answer

A simplified topology diagram using one line to represent multi-phase conductors

Answer

A detailed wiring diagram showing every individual conductor

Answer

A wiring diagram for single-phase residential branch circuits

Answer

A one-to-one scale drawing of a panel interior layout

Question 2

According to the National Electrical Code (NEC), what color identifies the equipment grounding conductor in US installations?

Accepted Answer

Green, green with yellow stripes, or bare copper

Answer

White or gray

Answer

Black

Answer

Red

Question 3

In AutoCAD Electrical, what does the 'wire numbering' tool accomplish?

Accepted Answer

Assigns unique wire tags to nets for identification in panel wiring and field installation

Answer

Assigns sequential numbers to schematic sheets automatically

Answer

Numbers components in order of placement on the drawing

Answer

Generates a wire gauge schedule based on current load calculations

Question 4

What does a 'normally open' (NO) contact symbol indicate in an electrical wiring diagram?

Accepted Answer

The contact is open (no current flows) in its default de-energized state

Answer

The contact passes current in its default de-energized state

Answer

The contact can only be activated manually by an operator

Answer

The contact is rated for voltages above 1000 V

Question 5

What is the purpose of a 'from-to list' (wire list) generated by electrical CAD software?

Accepted Answer

Lists each wire connection by its start terminal and end terminal to guide panel wiring

Answer

Documents the physical dimensions and bend radius of each wire bundle

Answer

Tracks wire color codes across all sheets in the schematic set

Answer

Specifies minimum conductor ampacity based on circuit breaker ratings

Question 6

What does IEC 61439 govern in relation to electrical equipment design and documentation?

Accepted Answer

Low-voltage switchgear and controlgear assemblies such as motor control centers

Answer

PCB layout design rules for industrial control boards

Answer

Relay logic schematic symbol standards for ladder diagrams

Answer

Grounding electrode conductor sizing methods for utility services

Question 7

In electrical panel design software such as AutoCAD Electrical or EPLAN, what is a 'macro'?

Accepted Answer

A pre-built, reusable component or circuit block inserted to accelerate repetitive design work

Answer

An automated voltage drop calculation for a circuit branch

Answer

A script that batch-exports drawings to PDF format

Answer

A 3D enclosure model pulled from a manufacturer's library