Zone priority for overlapping fills in PCB Design - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to set the priority of a zone fill.

PCB Design

zone.setPriority([1])

Drag options to blanks, or click blank then click option'

A10

B5

C15

D20

Attempts:

3 left

💡 Hint

Common Mistakes

Using a string instead of an integer for priority.

Setting priority to zero which disables priority.

The priority value 10 is commonly used to set a medium priority for zone fills.

2fill in blank

medium

Complete the code to check if a zone has higher priority than another.

PCB Design

if zone1.priority [1] zone2.priority:

Drag options to blanks, or click blank then click option'

A<

B==

C>

D<=

Attempts:

3 left

💡 Hint

Common Mistakes

Using < instead of > which reverses the logic.

Using equality check instead of comparison.

Higher priority means a greater numeric value, so use > to compare.

3fill in blank

hard

Fix the error in the code to correctly assign priority to overlapping zones.

PCB Design

zoneA.priority = [1]

Drag options to blanks, or click blank then click option'

A'high'

B10

Cpriority_high

DNone

Attempts:

3 left

💡 Hint

Common Mistakes

Assigning string values instead of integers.

Leaving priority as None which disables it.

Priority must be an integer value, not a string or None.

4fill in blank

hard

Fill both blanks to set and compare zone priorities correctly.

PCB Design

zone1.setPriority([1])
if zone1.priority [2] zone2.priority:

Drag options to blanks, or click blank then click option'

A15

B>

C<

D5

Attempts:

3 left

💡 Hint

Common Mistakes

Using < instead of > in comparison.

Setting priority to a lower value than intended.

Set zone1 priority to 15 and check if it is greater than zone2's priority.

5fill in blank

hard

Fill all three blanks to create a dictionary mapping zones to their priorities and filter high priority zones.

PCB Design

zone_priorities = [1]: zone.getPriority() for zone in zones if zone.getPriority() [2] [3]

Drag options to blanks, or click blank then click option'

Azone.name

B>

C10

Dzone.id

Attempts:

3 left

💡 Hint

Common Mistakes

Using zone.id instead of zone.name as dictionary key.

Using < instead of > in the filter condition.

Use zone.name as key, filter zones with priority greater than 10.

Practice

1. What does zone priority control in PCB design when fills overlap?

easy

A. Which copper fill appears on top

B. The thickness of the copper fill

C. The color of the copper fill

D. The shape of the copper fill

Solution

1. Step 1: Understand overlapping fills

   When two copper fills overlap, one must appear above the other to avoid confusion.

2. Step 2: Role of zone priority

   Zone priority sets which fill is drawn on top by assigning a higher priority number.

3. Final Answer:

   Which copper fill appears on top -> Option A

4. Quick Check:

   Zone priority controls top fill display [OK]

Hint: Higher priority number means fill appears on top [OK]

Common Mistakes:

• Confusing priority with fill thickness
• Thinking priority changes fill color
• Assuming priority affects fill shape

2. Which of the following is the correct way to assign a higher priority to a zone fill in a PCB design tool?

easy

A. Set the zone priority number to a lower value

B. Set the zone priority number to a higher value

C. Change the zone fill color to a brighter shade

D. Increase the zone fill thickness

Solution

1. Step 1: Understand priority numbering

   Higher numbers mean higher priority, so the fill with the bigger number appears on top.

2. Step 2: Assigning priority

   To make a zone appear above others, assign it a higher priority number.

3. Final Answer:

   Set the zone priority number to a higher value -> Option B

4. Quick Check:

   Higher number = higher priority [OK]

Hint: Use bigger numbers for top zones [OK]

Common Mistakes:

• Using lower numbers for higher priority
• Changing color instead of priority
• Adjusting thickness instead of priority

3. Given two overlapping zones: Zone A with priority 5 and Zone B with priority 8, which zone will appear on top in the PCB layout?

medium

A. Zone A will appear on top

B. Neither zone will appear

C. Both zones will merge and appear equally

D. Zone B will appear on top

Solution

1. Step 1: Compare priority values

   Zone A has priority 5, Zone B has priority 8; higher number means higher priority.

2. Step 2: Determine which zone appears on top

   Zone B's priority 8 is greater than Zone A's 5, so Zone B appears on top.

3. Final Answer:

   Zone B will appear on top -> Option D

4. Quick Check:

   Priority 8 > 5 means Zone B on top [OK]

Hint: Higher priority number wins overlap [OK]

Common Mistakes:

• Choosing lower priority zone as top
• Assuming zones merge visually
• Ignoring priority numbers

4. You set two overlapping zones with the same priority number. What issue might occur in your PCB design?

medium

A. The zones will overlap without clear top fill, causing design errors

B. The zone with the larger area will automatically appear on top

C. The software will assign random priority to one zone

D. The zones will merge into a single fill automatically

Solution

1. Step 1: Understand equal priority effect

   When zones have the same priority, the software cannot decide which fill is on top clearly.

2. Step 2: Resulting issue

   This causes overlapping fills without clear layering, leading to design errors or confusion.

3. Final Answer:

   The zones will overlap without clear top fill, causing design errors -> Option A

4. Quick Check:

   Same priority causes unclear overlap [OK]

Hint: Avoid equal priorities for overlapping zones [OK]

Common Mistakes:

• Assuming larger area wins automatically
• Thinking software assigns random priority
• Believing zones merge automatically

5. You have three overlapping zones with priorities 3, 7, and 5. You want the zone with priority 3 to appear on top without changing the other zones' priorities. What is the best approach?

hard

A. Set the zone with priority 3 to a negative number

B. Decrease the priority of the zone with 7 to below 3

C. Increase the priority of the zone with 3 to a number higher than 7

D. Change the fill color of the zone with priority 3 to make it appear on top

Solution

1. Step 1: Understand priority rules

   Zones with higher priority numbers appear on top of lower ones.

2. Step 2: Achieve desired top zone

   To make the zone with priority 3 appear on top, increase its priority above 7.

3. Step 3: Avoid changing other zones

   Since other zones' priorities cannot be changed, only increase the target zone's priority.

4. Final Answer:

   Increase the priority of the zone with 3 to a number higher than 7 -> Option C

5. Quick Check:

   Higher priority number = top zone [OK]

Hint: Raise target zone priority above others [OK]

Common Mistakes:

• Trying to set negative priority
• Changing color instead of priority
• Lowering other zones' priorities when not allowed