PCB material and copper weight basics in PCB Design - Practice Problems & Coding Challenges

Challenge - 5 Problems

🧠 Conceptual

intermediate

Understanding Copper Weight Impact on PCB Thickness

Which statement best describes how copper weight affects the overall thickness of a PCB?

A Copper weight affects only the electrical properties, not the physical thickness of the PCB.

B Copper weight does not affect PCB thickness since copper layers are always the same thickness regardless of weight.

C Increasing copper weight increases PCB thickness because thicker copper layers add to the board's total height.

D Higher copper weight decreases PCB thickness because it compresses the substrate material.

💡 Hint

Think about how adding more copper material changes the physical dimensions of the board.

More copper weight means thicker copper layers, which add to the total thickness of the PCB.

❓ dax_lod_result

intermediate

Calculate Total Copper Weight per Layer

Given a PCB with 4 layers, each having copper weights of 1 oz, 2 oz, 1 oz, and 0.5 oz respectively, what is the total copper weight?

PCB Design

TotalCopperWeight = SUM({1, 2, 1, 0.5})

A 4.5 oz

B 3.5 oz

C 5 oz

D 2.5 oz

💡 Hint

Add all copper weights from each layer.

Sum of 1 + 2 + 1 + 0.5 equals 4.5 oz total copper weight.

❓ visualization

advanced

Best Visualization for Comparing Copper Weights Across PCB Layers

Which visualization type best shows copper weight differences across multiple PCB layers clearly and accessibly?

A Pie chart showing percentage copper weight per layer

B Scatter plot with copper weight on X-axis and layer number on Y-axis

C Line chart connecting copper weights across layers over time

D Stacked bar chart showing copper weight per layer with distinct colors

💡 Hint

Think about comparing quantities across categories clearly.

Stacked bar charts clearly show quantities per category and allow easy comparison of copper weights per layer.

❓ data_modeling

advanced

Modeling PCB Material Properties in a BI Tool

Which data model design best supports analysis of PCB materials and copper weights by layer and board type?

A A fact table with copper weight and thickness measures linked to dimension tables for layer and board type

B Separate tables for copper weight and PCB thickness with no relationships

C A single flat table combining all PCB data without dimension tables

D A dimension table for copper weight and a fact table for board types

💡 Hint

Consider how to organize data for flexible filtering and aggregation.

A fact table with measures and linked dimension tables allows efficient analysis by layer and board type.

🔧 Formula Fix

expert

Identify the Error in Copper Weight Calculation DAX Expression

Given this DAX expression to calculate average copper weight per layer:
AverageCopperWeight = AVERAGE('PCB Layers'[CopperWeight])
Which issue will cause this measure to return incorrect results?

A The 'CopperWeight' column contains text values causing a type error

B The measure does not filter by board type, mixing different boards' layers

C AVERAGE function cannot be used on numeric columns

D The expression is missing a SUM aggregation before averaging

💡 Hint

Think about what happens if layers from different boards are mixed in the calculation.

Without filtering by board type, the average copper weight mixes layers from different boards, leading to misleading results.