Single-layer vs multi-layer PCB in PCB Design - Practice Questions

Challenge - 5 Problems

🧠 Conceptual

intermediate

Understanding PCB Layer Differences

Which of the following statements correctly describes a key difference between single-layer and multi-layer PCBs?

A Single-layer PCBs have components and circuits on only one side, while multi-layer PCBs have multiple layers of circuits stacked inside.

B Multi-layer PCBs always have components on both sides, while single-layer PCBs never have components on any side.

C Single-layer PCBs use flexible materials, while multi-layer PCBs are always rigid.

D Multi-layer PCBs are cheaper to produce than single-layer PCBs because they use fewer materials.

💡 Hint

Think about how many circuit layers each PCB type has.

Single-layer PCBs have circuits on one side only. Multi-layer PCBs stack several circuit layers inside the board, allowing more complex connections.

🎯 Scenario

intermediate

Choosing PCB Type for a Simple Device

You are designing a simple electronic device with low component count and low cost priority. Which PCB type is most suitable?

A Multi-layer PCB, because it supports complex circuits.

B Single-layer PCB, because it uses flexible materials.

C Multi-layer PCB, because it is always smaller in size.

D Single-layer PCB, because it is simpler and cheaper for low complexity.

💡 Hint

Consider cost and complexity for simple devices.

Single-layer PCBs are cheaper and simpler, making them ideal for low complexity and low cost devices.

❓ dax_lod_result

advanced

Calculating PCB Layer Usage in a BI Report

Given a dataset with PCB designs and their layer counts, which DAX measure correctly calculates the average number of layers used per PCB type?

Measure = AVERAGEX(VALUES(PCBs[Type]), CALCULATE(AVERAGE(PCBs[LayerCount])))

A Measure = AVERAGEX(VALUES(PCBs[Type]), CALCULATE(AVERAGE(PCBs[LayerCount])))

B Measure = CALCULATE(AVERAGE(PCBs[LayerCount]), ALLEXCEPT(PCBs, PCBs[Type]))

C Measure = SUMX(PCBs, PCBs[LayerCount]) / COUNTROWS(PCBs)

D Measure = AVERAGE(PCBs[LayerCount])

💡 Hint

Think about calculating average per group (PCB type).

AVERAGEX with VALUES groups by PCB type and calculates average layer count per type correctly.

❓ visualization

advanced

Best Visualization for PCB Layer Comparison

You want to create a dashboard comparing the number of PCBs produced by layer count (single-layer vs multi-layer) over time. Which visualization type is best?

A Pie chart showing total PCBs produced by layer type.

B Stacked column chart showing counts of PCBs by layer type per month.

C Scatter plot showing layer count vs production cost.

D Line chart showing total production cost over time.

💡 Hint

Consider comparing categories over time.

A stacked column chart clearly shows counts of different PCB layer types per month, making comparison easy.

🔧 Formula Fix

expert

Debugging PCB Layer Data Model Issue

In your BI model, you have a table 'PCBs' with columns 'PCB_ID', 'LayerCount', and 'ProductionDate'. You create a measure to count multi-layer PCBs as:

MultiLayerCount = COUNTROWS(FILTER(PCBs, PCBs[LayerCount] > 1))

However, the measure returns the total count of all PCBs regardless of layer count. What is the most likely cause?

A The LayerCount column contains text values causing the filter to fail silently.

B COUNTROWS cannot be used with FILTER in a measure.

C The FILTER function is not applied correctly because the measure lacks CALCULATE to apply the filter context.

D The measure should use SUM instead of COUNTROWS to count PCBs.

💡 Hint

Think about how filter context works in DAX measures.

FILTER alone does not change filter context in a measure without CALCULATE. Wrapping FILTER inside CALCULATE applies the filter correctly.