PCB(3)_Mechanical Design Considerations (1)

Which of the following is not a mechanical design consideration for Printed Circuit Boards?

• Voltage regulation

• Conductor temperature rise

• Moisture resistance

• Thermal shock and temperature cycling

Answer explanation

The correct choice is 'Voltage regulation' because it is not a mechanical design consideration for Printed Circuit Boards.

What is the main purpose of via holes in PTH boards?

• For insulation resistance

• For flame resistance

• For through contacts

• For component mounting

Answer explanation

Via holes in PTH boards are mainly used for through contacts, allowing electrical connections between different layers of the board.

What is the approximate cost of assembling components on a double-sided PCB with PTH compared to a single-sided PCB?

• Same cost

• 25% less

• 50% more

• 30% more

Answer explanation

Assembling components on a double-sided PCB with PTH is approximately 30% more expensive compared to a single-sided PCB due to the additional complexity and materials required for the double-sided PCB.

How is the component area on the board calculated?

• By adding the contribution of each single component

• By calculating the board volume

• By counting the number of components

• By measuring the board dimensions

Answer explanation

The component area on the board is calculated by adding the contribution of each single component, making this the correct choice.

What is the purpose of providing a 5 to 10 per cent area for modification on the PCB?

• For cooling the components

• For testing purposes

• For any required modifications

• For component mounting

Answer explanation

The purpose of providing a 5 to 10 per cent area for modification on the PCB is to allow for any required modifications to be made easily.

Why is it important to express board outlines with tolerance?

• To enhance heat dissipation

• To improve component mounting

• To increase board size

• To reduce manufacturing cost

Answer explanation

Expressing board outlines with tolerance helps reduce manufacturing cost by minimizing errors and rework during the production process.

What is the recommended distance for supporting a board within 25 mm of the board edge?

• 20 cm intervals

• 10 cm intervals

• 15 cm intervals

• 5 cm intervals

Answer explanation

The recommended distance for supporting a board within 25 mm of the board edge is at 10 cm intervals, as it provides adequate support and stability.

What factors determine the choice of board mounting technique?

• Board size and shape

• Component color

• Power consumption

• Weather conditions

Answer explanation

The choice of board mounting technique is determined by board size and shape, as these factors dictate the appropriate method for secure attachment.

What is the main advantage of splitting the board into two or more boards?

• Decreased maintenance requirements

• Lower testing efficiency

• Higher manufacturing cost

• Easier layout design

Answer explanation

Splitting the board into two or more boards makes layout design easier by allowing for more flexibility and customization in arranging components.

What is the purpose of partitioning equipment in different ways?

• To improve heat dissipation

• To increase interconnections

• To decrease board size

• To minimize total number of interconnections

Answer explanation

Partitioning equipment in different ways helps minimize the total number of interconnections, making the system more efficient and reducing complexity.